![Marc Zyngier](/assets/img/avatar_default.png)
Since 126b16e2ad
("Docs: dt: add generic MSI bindings"),
the definition of "msi-parent" has evolved, while maintaining
some degree of compatibility. It can now express multiple MSI
controllers as parents, as well as some sideband data being
communicated to the controller.
This patch adds the parsing of the property, iterating over
the multiple parents until a suitable irqdomain is found.
It can also fallback to the original parsing if the old
binding is detected.
This support code gets used in the subsequent patches.
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
744 lines
20 KiB
C
744 lines
20 KiB
C
/*
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* Derived from arch/i386/kernel/irq.c
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* Copyright (C) 1992 Linus Torvalds
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* Adapted from arch/i386 by Gary Thomas
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Updated and modified by Cort Dougan <cort@fsmlabs.com>
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* Copyright (C) 1996-2001 Cort Dougan
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* Adapted for Power Macintosh by Paul Mackerras
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* Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* This file contains the code used to make IRQ descriptions in the
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* device tree to actual irq numbers on an interrupt controller
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* driver.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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/**
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* irq_of_parse_and_map - Parse and map an interrupt into linux virq space
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* @dev: Device node of the device whose interrupt is to be mapped
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* @index: Index of the interrupt to map
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*
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* This function is a wrapper that chains of_irq_parse_one() and
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* irq_create_of_mapping() to make things easier to callers
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*/
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unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
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{
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struct of_phandle_args oirq;
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if (of_irq_parse_one(dev, index, &oirq))
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return 0;
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return irq_create_of_mapping(&oirq);
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}
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EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
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/**
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* of_irq_find_parent - Given a device node, find its interrupt parent node
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* @child: pointer to device node
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*
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* Returns a pointer to the interrupt parent node, or NULL if the interrupt
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* parent could not be determined.
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*/
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struct device_node *of_irq_find_parent(struct device_node *child)
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{
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struct device_node *p;
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const __be32 *parp;
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if (!of_node_get(child))
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return NULL;
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do {
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parp = of_get_property(child, "interrupt-parent", NULL);
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if (parp == NULL)
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p = of_get_parent(child);
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else {
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if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
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p = of_node_get(of_irq_dflt_pic);
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else
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p = of_find_node_by_phandle(be32_to_cpup(parp));
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}
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of_node_put(child);
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child = p;
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} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
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return p;
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}
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/**
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* of_irq_parse_raw - Low level interrupt tree parsing
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* @parent: the device interrupt parent
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* @addr: address specifier (start of "reg" property of the device) in be32 format
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* @out_irq: structure of_irq updated by this function
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*
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* Returns 0 on success and a negative number on error
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*
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* This function is a low-level interrupt tree walking function. It
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* can be used to do a partial walk with synthetized reg and interrupts
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* properties, for example when resolving PCI interrupts when no device
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* node exist for the parent. It takes an interrupt specifier structure as
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* input, walks the tree looking for any interrupt-map properties, translates
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* the specifier for each map, and then returns the translated map.
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*/
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int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
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{
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struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
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__be32 initial_match_array[MAX_PHANDLE_ARGS];
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const __be32 *match_array = initial_match_array;
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const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 };
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u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
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int imaplen, match, i;
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#ifdef DEBUG
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of_print_phandle_args("of_irq_parse_raw: ", out_irq);
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#endif
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ipar = of_node_get(out_irq->np);
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/* First get the #interrupt-cells property of the current cursor
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* that tells us how to interpret the passed-in intspec. If there
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* is none, we are nice and just walk up the tree
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*/
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do {
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tmp = of_get_property(ipar, "#interrupt-cells", NULL);
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if (tmp != NULL) {
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intsize = be32_to_cpu(*tmp);
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break;
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}
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tnode = ipar;
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ipar = of_irq_find_parent(ipar);
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of_node_put(tnode);
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} while (ipar);
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if (ipar == NULL) {
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pr_debug(" -> no parent found !\n");
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goto fail;
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}
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pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize);
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if (out_irq->args_count != intsize)
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return -EINVAL;
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/* Look for this #address-cells. We have to implement the old linux
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* trick of looking for the parent here as some device-trees rely on it
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*/
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old = of_node_get(ipar);
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do {
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tmp = of_get_property(old, "#address-cells", NULL);
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tnode = of_get_parent(old);
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of_node_put(old);
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old = tnode;
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} while (old && tmp == NULL);
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of_node_put(old);
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old = NULL;
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addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp);
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pr_debug(" -> addrsize=%d\n", addrsize);
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/* Range check so that the temporary buffer doesn't overflow */
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if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS))
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goto fail;
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/* Precalculate the match array - this simplifies match loop */
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for (i = 0; i < addrsize; i++)
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initial_match_array[i] = addr ? addr[i] : 0;
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for (i = 0; i < intsize; i++)
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initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]);
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/* Now start the actual "proper" walk of the interrupt tree */
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while (ipar != NULL) {
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/* Now check if cursor is an interrupt-controller and if it is
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* then we are done
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*/
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if (of_get_property(ipar, "interrupt-controller", NULL) !=
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NULL) {
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pr_debug(" -> got it !\n");
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return 0;
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}
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/*
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* interrupt-map parsing does not work without a reg
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* property when #address-cells != 0
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*/
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if (addrsize && !addr) {
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pr_debug(" -> no reg passed in when needed !\n");
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goto fail;
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}
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/* Now look for an interrupt-map */
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imap = of_get_property(ipar, "interrupt-map", &imaplen);
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/* No interrupt map, check for an interrupt parent */
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if (imap == NULL) {
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pr_debug(" -> no map, getting parent\n");
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newpar = of_irq_find_parent(ipar);
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goto skiplevel;
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}
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imaplen /= sizeof(u32);
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/* Look for a mask */
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imask = of_get_property(ipar, "interrupt-map-mask", NULL);
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if (!imask)
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imask = dummy_imask;
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/* Parse interrupt-map */
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match = 0;
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while (imaplen > (addrsize + intsize + 1) && !match) {
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/* Compare specifiers */
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match = 1;
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for (i = 0; i < (addrsize + intsize); i++, imaplen--)
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match &= !((match_array[i] ^ *imap++) & imask[i]);
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pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
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/* Get the interrupt parent */
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if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
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newpar = of_node_get(of_irq_dflt_pic);
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else
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newpar = of_find_node_by_phandle(be32_to_cpup(imap));
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imap++;
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--imaplen;
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/* Check if not found */
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if (newpar == NULL) {
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pr_debug(" -> imap parent not found !\n");
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goto fail;
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}
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if (!of_device_is_available(newpar))
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match = 0;
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/* Get #interrupt-cells and #address-cells of new
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* parent
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*/
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tmp = of_get_property(newpar, "#interrupt-cells", NULL);
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if (tmp == NULL) {
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pr_debug(" -> parent lacks #interrupt-cells!\n");
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goto fail;
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}
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newintsize = be32_to_cpu(*tmp);
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tmp = of_get_property(newpar, "#address-cells", NULL);
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newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
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pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
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newintsize, newaddrsize);
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/* Check for malformed properties */
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if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS))
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goto fail;
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if (imaplen < (newaddrsize + newintsize))
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goto fail;
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imap += newaddrsize + newintsize;
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imaplen -= newaddrsize + newintsize;
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pr_debug(" -> imaplen=%d\n", imaplen);
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}
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if (!match)
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goto fail;
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/*
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* Successfully parsed an interrrupt-map translation; copy new
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* interrupt specifier into the out_irq structure
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*/
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match_array = imap - newaddrsize - newintsize;
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for (i = 0; i < newintsize; i++)
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out_irq->args[i] = be32_to_cpup(imap - newintsize + i);
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out_irq->args_count = intsize = newintsize;
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addrsize = newaddrsize;
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skiplevel:
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/* Iterate again with new parent */
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out_irq->np = newpar;
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pr_debug(" -> new parent: %s\n", of_node_full_name(newpar));
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of_node_put(ipar);
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ipar = newpar;
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newpar = NULL;
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}
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fail:
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of_node_put(ipar);
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of_node_put(newpar);
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(of_irq_parse_raw);
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/**
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* of_irq_parse_one - Resolve an interrupt for a device
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* @device: the device whose interrupt is to be resolved
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* @index: index of the interrupt to resolve
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* @out_irq: structure of_irq filled by this function
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*
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* This function resolves an interrupt for a node by walking the interrupt tree,
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* finding which interrupt controller node it is attached to, and returning the
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* interrupt specifier that can be used to retrieve a Linux IRQ number.
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*/
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int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq)
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{
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struct device_node *p;
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const __be32 *intspec, *tmp, *addr;
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u32 intsize, intlen;
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int i, res;
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pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index);
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/* OldWorld mac stuff is "special", handle out of line */
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if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
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return of_irq_parse_oldworld(device, index, out_irq);
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/* Get the reg property (if any) */
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addr = of_get_property(device, "reg", NULL);
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/* Try the new-style interrupts-extended first */
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res = of_parse_phandle_with_args(device, "interrupts-extended",
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"#interrupt-cells", index, out_irq);
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if (!res)
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return of_irq_parse_raw(addr, out_irq);
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/* Get the interrupts property */
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intspec = of_get_property(device, "interrupts", &intlen);
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if (intspec == NULL)
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return -EINVAL;
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intlen /= sizeof(*intspec);
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pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);
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/* Look for the interrupt parent. */
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p = of_irq_find_parent(device);
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if (p == NULL)
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return -EINVAL;
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/* Get size of interrupt specifier */
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tmp = of_get_property(p, "#interrupt-cells", NULL);
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if (tmp == NULL) {
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res = -EINVAL;
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goto out;
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}
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intsize = be32_to_cpu(*tmp);
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pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
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/* Check index */
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if ((index + 1) * intsize > intlen) {
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res = -EINVAL;
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goto out;
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}
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/* Copy intspec into irq structure */
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intspec += index * intsize;
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out_irq->np = p;
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out_irq->args_count = intsize;
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for (i = 0; i < intsize; i++)
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out_irq->args[i] = be32_to_cpup(intspec++);
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/* Check if there are any interrupt-map translations to process */
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res = of_irq_parse_raw(addr, out_irq);
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out:
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of_node_put(p);
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return res;
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}
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EXPORT_SYMBOL_GPL(of_irq_parse_one);
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/**
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* of_irq_to_resource - Decode a node's IRQ and return it as a resource
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* @dev: pointer to device tree node
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* @index: zero-based index of the irq
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* @r: pointer to resource structure to return result into.
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*/
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int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
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{
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int irq = irq_of_parse_and_map(dev, index);
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/* Only dereference the resource if both the
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* resource and the irq are valid. */
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if (r && irq) {
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const char *name = NULL;
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memset(r, 0, sizeof(*r));
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/*
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* Get optional "interrupt-names" property to add a name
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* to the resource.
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*/
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of_property_read_string_index(dev, "interrupt-names", index,
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&name);
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r->start = r->end = irq;
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r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq));
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r->name = name ? name : of_node_full_name(dev);
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}
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return irq;
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}
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EXPORT_SYMBOL_GPL(of_irq_to_resource);
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/**
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* of_irq_get - Decode a node's IRQ and return it as a Linux irq number
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* @dev: pointer to device tree node
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* @index: zero-based index of the irq
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*
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* Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
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* is not yet created.
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*
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*/
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int of_irq_get(struct device_node *dev, int index)
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{
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int rc;
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struct of_phandle_args oirq;
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struct irq_domain *domain;
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rc = of_irq_parse_one(dev, index, &oirq);
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if (rc)
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return rc;
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domain = irq_find_host(oirq.np);
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if (!domain)
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return -EPROBE_DEFER;
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return irq_create_of_mapping(&oirq);
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}
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EXPORT_SYMBOL_GPL(of_irq_get);
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/**
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* of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number
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* @dev: pointer to device tree node
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* @name: irq name
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*
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* Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
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* is not yet created, or error code in case of any other failure.
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*/
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int of_irq_get_byname(struct device_node *dev, const char *name)
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{
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int index;
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if (unlikely(!name))
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return -EINVAL;
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index = of_property_match_string(dev, "interrupt-names", name);
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if (index < 0)
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return index;
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return of_irq_get(dev, index);
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}
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EXPORT_SYMBOL_GPL(of_irq_get_byname);
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/**
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* of_irq_count - Count the number of IRQs a node uses
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* @dev: pointer to device tree node
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*/
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int of_irq_count(struct device_node *dev)
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{
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struct of_phandle_args irq;
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int nr = 0;
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while (of_irq_parse_one(dev, nr, &irq) == 0)
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nr++;
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return nr;
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}
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/**
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* of_irq_to_resource_table - Fill in resource table with node's IRQ info
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* @dev: pointer to device tree node
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* @res: array of resources to fill in
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* @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
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*
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* Returns the size of the filled in table (up to @nr_irqs).
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*/
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int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
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int nr_irqs)
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{
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int i;
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for (i = 0; i < nr_irqs; i++, res++)
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if (!of_irq_to_resource(dev, i, res))
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break;
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return i;
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}
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EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
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struct of_intc_desc {
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struct list_head list;
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struct device_node *dev;
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struct device_node *interrupt_parent;
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};
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/**
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* of_irq_init - Scan and init matching interrupt controllers in DT
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* @matches: 0 terminated array of nodes to match and init function to call
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*
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* This function scans the device tree for matching interrupt controller nodes,
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* and calls their initialization functions in order with parents first.
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*/
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void __init of_irq_init(const struct of_device_id *matches)
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{
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struct device_node *np, *parent = NULL;
|
|
struct of_intc_desc *desc, *temp_desc;
|
|
struct list_head intc_desc_list, intc_parent_list;
|
|
|
|
INIT_LIST_HEAD(&intc_desc_list);
|
|
INIT_LIST_HEAD(&intc_parent_list);
|
|
|
|
for_each_matching_node(np, matches) {
|
|
if (!of_find_property(np, "interrupt-controller", NULL) ||
|
|
!of_device_is_available(np))
|
|
continue;
|
|
/*
|
|
* Here, we allocate and populate an of_intc_desc with the node
|
|
* pointer, interrupt-parent device_node etc.
|
|
*/
|
|
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
|
|
if (WARN_ON(!desc))
|
|
goto err;
|
|
|
|
desc->dev = np;
|
|
desc->interrupt_parent = of_irq_find_parent(np);
|
|
if (desc->interrupt_parent == np)
|
|
desc->interrupt_parent = NULL;
|
|
list_add_tail(&desc->list, &intc_desc_list);
|
|
}
|
|
|
|
/*
|
|
* The root irq controller is the one without an interrupt-parent.
|
|
* That one goes first, followed by the controllers that reference it,
|
|
* followed by the ones that reference the 2nd level controllers, etc.
|
|
*/
|
|
while (!list_empty(&intc_desc_list)) {
|
|
/*
|
|
* Process all controllers with the current 'parent'.
|
|
* First pass will be looking for NULL as the parent.
|
|
* The assumption is that NULL parent means a root controller.
|
|
*/
|
|
list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
|
|
const struct of_device_id *match;
|
|
int ret;
|
|
of_irq_init_cb_t irq_init_cb;
|
|
|
|
if (desc->interrupt_parent != parent)
|
|
continue;
|
|
|
|
list_del(&desc->list);
|
|
match = of_match_node(matches, desc->dev);
|
|
if (WARN(!match->data,
|
|
"of_irq_init: no init function for %s\n",
|
|
match->compatible)) {
|
|
kfree(desc);
|
|
continue;
|
|
}
|
|
|
|
pr_debug("of_irq_init: init %s @ %p, parent %p\n",
|
|
match->compatible,
|
|
desc->dev, desc->interrupt_parent);
|
|
irq_init_cb = (of_irq_init_cb_t)match->data;
|
|
ret = irq_init_cb(desc->dev, desc->interrupt_parent);
|
|
if (ret) {
|
|
kfree(desc);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* This one is now set up; add it to the parent list so
|
|
* its children can get processed in a subsequent pass.
|
|
*/
|
|
list_add_tail(&desc->list, &intc_parent_list);
|
|
}
|
|
|
|
/* Get the next pending parent that might have children */
|
|
desc = list_first_entry_or_null(&intc_parent_list,
|
|
typeof(*desc), list);
|
|
if (!desc) {
|
|
pr_err("of_irq_init: children remain, but no parents\n");
|
|
break;
|
|
}
|
|
list_del(&desc->list);
|
|
parent = desc->dev;
|
|
kfree(desc);
|
|
}
|
|
|
|
list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) {
|
|
list_del(&desc->list);
|
|
kfree(desc);
|
|
}
|
|
err:
|
|
list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
|
|
list_del(&desc->list);
|
|
kfree(desc);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* of_msi_configure - Set the msi_domain field of a device
|
|
* @dev: device structure to associate with an MSI irq domain
|
|
* @np: device node for that device
|
|
*/
|
|
void of_msi_configure(struct device *dev, struct device_node *np)
|
|
{
|
|
struct device_node *msi_np;
|
|
struct irq_domain *d;
|
|
|
|
msi_np = of_parse_phandle(np, "msi-parent", 0);
|
|
if (!msi_np)
|
|
return;
|
|
|
|
d = irq_find_matching_host(msi_np, DOMAIN_BUS_PLATFORM_MSI);
|
|
if (!d)
|
|
d = irq_find_host(msi_np);
|
|
dev_set_msi_domain(dev, d);
|
|
}
|
|
|
|
/**
|
|
* of_msi_map_rid - Map a MSI requester ID for a device.
|
|
* @dev: device for which the mapping is to be done.
|
|
* @msi_np: device node of the expected msi controller.
|
|
* @rid_in: unmapped MSI requester ID for the device.
|
|
*
|
|
* Walk up the device hierarchy looking for devices with a "msi-map"
|
|
* property. If found, apply the mapping to @rid_in.
|
|
*
|
|
* Returns the mapped MSI requester ID.
|
|
*/
|
|
u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
|
|
{
|
|
struct device *parent_dev;
|
|
struct device_node *msi_controller_node;
|
|
u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle;
|
|
int msi_map_len;
|
|
bool matched;
|
|
u32 rid_out = rid_in;
|
|
const __be32 *msi_map = NULL;
|
|
|
|
/*
|
|
* Walk up the device parent links looking for one with a
|
|
* "msi-map" property.
|
|
*/
|
|
for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) {
|
|
if (!parent_dev->of_node)
|
|
continue;
|
|
|
|
msi_map = of_get_property(parent_dev->of_node,
|
|
"msi-map", &msi_map_len);
|
|
if (!msi_map)
|
|
continue;
|
|
|
|
if (msi_map_len % (4 * sizeof(__be32))) {
|
|
dev_err(parent_dev, "Error: Bad msi-map length: %d\n",
|
|
msi_map_len);
|
|
return rid_out;
|
|
}
|
|
/* We have a good parent_dev and msi_map, let's use them. */
|
|
break;
|
|
}
|
|
if (!msi_map)
|
|
return rid_out;
|
|
|
|
/* The default is to select all bits. */
|
|
map_mask = 0xffffffff;
|
|
|
|
/*
|
|
* Can be overridden by "msi-map-mask" property. If
|
|
* of_property_read_u32() fails, the default is used.
|
|
*/
|
|
of_property_read_u32(parent_dev->of_node, "msi-map-mask", &map_mask);
|
|
|
|
masked_rid = map_mask & rid_in;
|
|
matched = false;
|
|
while (!matched && msi_map_len >= 4 * sizeof(__be32)) {
|
|
rid_base = be32_to_cpup(msi_map + 0);
|
|
phandle = be32_to_cpup(msi_map + 1);
|
|
msi_base = be32_to_cpup(msi_map + 2);
|
|
rid_len = be32_to_cpup(msi_map + 3);
|
|
|
|
msi_controller_node = of_find_node_by_phandle(phandle);
|
|
|
|
matched = masked_rid >= rid_base &&
|
|
masked_rid < rid_base + rid_len &&
|
|
msi_np == msi_controller_node;
|
|
|
|
of_node_put(msi_controller_node);
|
|
msi_map_len -= 4 * sizeof(__be32);
|
|
msi_map += 4;
|
|
}
|
|
if (!matched)
|
|
return rid_out;
|
|
|
|
rid_out = masked_rid + msi_base;
|
|
dev_dbg(dev,
|
|
"msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: %08x, rid: %08x -> %08x\n",
|
|
dev_name(parent_dev), map_mask, rid_base, msi_base,
|
|
rid_len, rid_in, rid_out);
|
|
|
|
return rid_out;
|
|
}
|
|
|
|
static struct irq_domain *__of_get_msi_domain(struct device_node *np,
|
|
enum irq_domain_bus_token token)
|
|
{
|
|
struct irq_domain *d;
|
|
|
|
d = irq_find_matching_host(np, token);
|
|
if (!d)
|
|
d = irq_find_host(np);
|
|
|
|
return d;
|
|
}
|
|
|
|
/**
|
|
* of_msi_get_domain - Use msi-parent to find the relevant MSI domain
|
|
* @dev: device for which the domain is requested
|
|
* @np: device node for @dev
|
|
* @token: bus type for this domain
|
|
*
|
|
* Parse the msi-parent property (both the simple and the complex
|
|
* versions), and returns the corresponding MSI domain.
|
|
*
|
|
* Returns: the MSI domain for this device (or NULL on failure).
|
|
*/
|
|
struct irq_domain *of_msi_get_domain(struct device *dev,
|
|
struct device_node *np,
|
|
enum irq_domain_bus_token token)
|
|
{
|
|
struct device_node *msi_np;
|
|
struct irq_domain *d;
|
|
|
|
/* Check for a single msi-parent property */
|
|
msi_np = of_parse_phandle(np, "msi-parent", 0);
|
|
if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) {
|
|
d = __of_get_msi_domain(msi_np, token);
|
|
if (!d)
|
|
of_node_put(msi_np);
|
|
return d;
|
|
}
|
|
|
|
if (token == DOMAIN_BUS_PLATFORM_MSI) {
|
|
/* Check for the complex msi-parent version */
|
|
struct of_phandle_args args;
|
|
int index = 0;
|
|
|
|
while (!of_parse_phandle_with_args(np, "msi-parent",
|
|
"#msi-cells",
|
|
index, &args)) {
|
|
d = __of_get_msi_domain(args.np, token);
|
|
if (d)
|
|
return d;
|
|
|
|
of_node_put(args.np);
|
|
index++;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|