![Linus Torvalds](/assets/img/avatar_default.png)
cycle: Core changes: - Device links can optionally be added between a pin control producer and its consumers. This will affect how the system power management is handled: a pin controller will not suspend before all of its consumers have been suspended. This was necessary for the ST Microelectronics STMFX expander and need to be tested on other systems as well: it makes sense to make this default in the long run. Right now it is opt-in per driver. - Drive strength can be specified in microamps. With decreases in silicon technology, milliamps isn't granular enough, let's make it possible to select drive strengths in microamps. Right now the Meson (AMlogic) driver needs this. New drivers: - New subdriver for the Tegra 194 SoC. - New subdriver for the Qualcomm SDM845. - New subdriver for the Qualcomm SM8150. - New subdriver for the Freescale i.MX8MN (Freescale is now a product line of NXP). - New subdriver for Marvell MV98DX1135. Driver improvements: - The Bitmain BM1880 driver now supports pin config in addition to muxing. - The Qualcomm drivers can now reserve some GPIOs as taken aside and not usable for users. This is used in ACPI systems to take out some GPIO lines used by the BIOS so that noone else (neither kernel nor userspace) will play with them by mistake and crash the machine. - A slew of refurbishing around the Aspeed drivers (board management controllers for servers) in preparation for the new Aspeed AST2600 SoC. - A slew of improvements over the SH PFC drivers as usual. - Misc cleanups and fixes. -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEElDRnuGcz/wPCXQWMQRCzN7AZXXMFAl0oTPcACgkQQRCzN7AZ XXNTsw//aNPfkJS8gRszv58G56lyuO8h6Cq4m5eDpzhlpjx5qjELgi9h2UNGINqD 7CWxo35ufbKe0fDIcqpXmtuDMtSu6MuKT3SMepuw9uf9wxyndK4RIuyb0lpAJrx2 +NMPxzS+ARlrMmcfvXPRyPWHqAkXsQk6zcCgiuNCPtROkOZgs1YZ3+pemZw2/FMq gSLTO/95p0TPWr6YAlpByqfsA1A/onEm9HOiU2INV7DrAfUj7mnkuC1nZ4IJDFcv Gn6qQVQPah+MBzkwt4WXy5kDRozCIbg7x+FQBw3KAO23TrLDTFuNsYIWGFcP2CN2 eT8iSP3cWrXNUuEgcPD59aO07rhFooT+QBQFt2ih1dJCV1u/795wb57nxSh1YDcO M2tG+AW2EZky65FXwhLW2rq3LvmTM4kiEz3mA/DrcOAKvvQllK+6FKEhNy0StstP yvvlqoXdgH3sfOnWTAyHr35qA/pMuGEXSryWTJPqpflCvZ3wxNk+IV5nyPAtfaFz CK7U0Ya7NaEp/5ZlpE720apJ4uSqmRrLwk5Y1eKQvT46mGOk3rC9ZPIMXc8mB10/ mJ9mTubi1t4uIPnBl/T1T7f8QhNtr9hOY6wjLf1LoMeJ1XVNBqA+2uydOlBJ1iop RQ7y/Jl1SZ/gBzKCmvjPHT2+0Oui9oXGd9bQi0xQKO5Lus/nAIg= =Wdw1 -----END PGP SIGNATURE----- Merge tag 'pinctrl-v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "This is the bulk of pin control changes for the v5.3 kernel cycle: Core changes: - Device links can optionally be added between a pin control producer and its consumers. This will affect how the system power management is handled: a pin controller will not suspend before all of its consumers have been suspended. This was necessary for the ST Microelectronics STMFX expander and need to be tested on other systems as well: it makes sense to make this default in the long run. Right now it is opt-in per driver. - Drive strength can be specified in microamps. With decreases in silicon technology, milliamps isn't granular enough, let's make it possible to select drive strengths in microamps. Right now the Meson (AMlogic) driver needs this. New drivers: - New subdriver for the Tegra 194 SoC. - New subdriver for the Qualcomm SDM845. - New subdriver for the Qualcomm SM8150. - New subdriver for the Freescale i.MX8MN (Freescale is now a product line of NXP). - New subdriver for Marvell MV98DX1135. Driver improvements: - The Bitmain BM1880 driver now supports pin config in addition to muxing. - The Qualcomm drivers can now reserve some GPIOs as taken aside and not usable for users. This is used in ACPI systems to take out some GPIO lines used by the BIOS so that noone else (neither kernel nor userspace) will play with them by mistake and crash the machine. - A slew of refurbishing around the Aspeed drivers (board management controllers for servers) in preparation for the new Aspeed AST2600 SoC. - A slew of improvements over the SH PFC drivers as usual. - Misc cleanups and fixes" * tag 'pinctrl-v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (106 commits) pinctrl: aspeed: Strip moved macros and structs from private header pinctrl: aspeed: Fix missed include pinctrl: baytrail: Use GENMASK() consistently pinctrl: baytrail: Re-use data structures from pinctrl-intel.h pinctrl: baytrail: Use defined macro instead of magic in byt_get_gpio_mux() pinctrl: qcom: Add SM8150 pinctrl driver dt-bindings: pinctrl: qcom: Add SM8150 pinctrl binding dt-bindings: pinctrl: qcom: Document missing gpio nodes pinctrl: aspeed: Add implementation-related documentation pinctrl: aspeed: Split out pinmux from general pinctrl pinctrl: aspeed: Clarify comment about strapping W1C pinctrl: aspeed: Correct comment that is no longer true MAINTAINERS: Add entry for ASPEED pinctrl drivers dt-bindings: pinctrl: aspeed: Convert AST2500 bindings to json-schema dt-bindings: pinctrl: aspeed: Convert AST2400 bindings to json-schema dt-bindings: pinctrl: aspeed: Split bindings document in two pinctrl: qcom: Add irq_enable callback for msm gpio pinctrl: madera: Fixup SPDX headers pinctrl: qcom: sdm845: Fix CONFIG preprocessor guard pinctrl: tegra: Add bitmask support for parked bits ...
414 lines
12 KiB
C
414 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Core driver for the generic pin config portions of the pin control subsystem
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*
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* Copyright (C) 2011 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*/
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#define pr_fmt(fmt) "generic pinconfig core: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/of.h>
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#include "core.h"
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#include "pinconf.h"
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#include "pinctrl-utils.h"
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#ifdef CONFIG_DEBUG_FS
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static const struct pin_config_item conf_items[] = {
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PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
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"input bias pull to pin specific state", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
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PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true),
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PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
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PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
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PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
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PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
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PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
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PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
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PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true),
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};
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static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
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struct seq_file *s, const char *gname,
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unsigned pin,
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const struct pin_config_item *items,
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int nitems, int *print_sep)
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{
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int i;
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for (i = 0; i < nitems; i++) {
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unsigned long config;
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int ret;
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/* We want to check out this parameter */
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config = pinconf_to_config_packed(items[i].param, 0);
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if (gname)
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ret = pin_config_group_get(dev_name(pctldev->dev),
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gname, &config);
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else
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ret = pin_config_get_for_pin(pctldev, pin, &config);
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/* These are legal errors */
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if (ret == -EINVAL || ret == -ENOTSUPP)
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continue;
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if (ret) {
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seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
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continue;
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}
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/* comma between multiple configs */
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if (*print_sep)
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seq_puts(s, ", ");
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*print_sep = 1;
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seq_puts(s, items[i].display);
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/* Print unit if available */
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if (items[i].has_arg) {
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seq_printf(s, " (%u",
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pinconf_to_config_argument(config));
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if (items[i].format)
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seq_printf(s, " %s)", items[i].format);
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else
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seq_puts(s, ")");
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}
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}
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}
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/**
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* pinconf_generic_dump_pins - Print information about pin or group of pins
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* @pctldev: Pincontrol device
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* @s: File to print to
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* @gname: Group name specifying pins
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* @pin: Pin number specyfying pin
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*
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* Print the pinconf configuration for the requested pin(s) to @s. Pins can be
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* specified either by pin using @pin or by group using @gname. Only one needs
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* to be specified the other can be NULL/0.
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*/
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void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
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const char *gname, unsigned pin)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int print_sep = 0;
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if (!ops->is_generic)
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return;
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/* generic parameters */
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pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
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ARRAY_SIZE(conf_items), &print_sep);
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/* driver-specific parameters */
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if (pctldev->desc->num_custom_params &&
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pctldev->desc->custom_conf_items)
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pinconf_generic_dump_one(pctldev, s, gname, pin,
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pctldev->desc->custom_conf_items,
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pctldev->desc->num_custom_params,
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&print_sep);
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}
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void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned long config)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
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if (pinconf_to_config_param(config) != conf_items[i].param)
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continue;
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seq_printf(s, "%s: 0x%x", conf_items[i].display,
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pinconf_to_config_argument(config));
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}
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if (!pctldev->desc->num_custom_params ||
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!pctldev->desc->custom_conf_items)
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return;
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for (i = 0; i < pctldev->desc->num_custom_params; i++) {
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if (pinconf_to_config_param(config) !=
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pctldev->desc->custom_conf_items[i].param)
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continue;
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seq_printf(s, "%s: 0x%x",
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pctldev->desc->custom_conf_items[i].display,
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pinconf_to_config_argument(config));
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}
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}
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EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
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#endif
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#ifdef CONFIG_OF
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static const struct pinconf_generic_params dt_params[] = {
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{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
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{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
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{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
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{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
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{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
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{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
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{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
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{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
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{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
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{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
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{ "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 },
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{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
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{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
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{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
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{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
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{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
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{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
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{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
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{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
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{ "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
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{ "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
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{ "output-high", PIN_CONFIG_OUTPUT, 1, },
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{ "output-low", PIN_CONFIG_OUTPUT, 0, },
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{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
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{ "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
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{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
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{ "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
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};
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/**
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* parse_dt_cfg() - Parse DT pinconf parameters
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* @np: DT node
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* @params: Array of describing generic parameters
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* @count: Number of entries in @params
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* @cfg: Array of parsed config options
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* @ncfg: Number of entries in @cfg
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*
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* Parse the config options described in @params from @np and puts the result
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* in @cfg. @cfg does not need to be empty, entries are added beginning at
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* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
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* needs to have enough memory allocated to hold all possible entries.
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*/
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static void parse_dt_cfg(struct device_node *np,
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const struct pinconf_generic_params *params,
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unsigned int count, unsigned long *cfg,
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unsigned int *ncfg)
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{
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int i;
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for (i = 0; i < count; i++) {
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u32 val;
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int ret;
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const struct pinconf_generic_params *par = ¶ms[i];
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ret = of_property_read_u32(np, par->property, &val);
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/* property not found */
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if (ret == -EINVAL)
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continue;
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/* use default value, when no value is specified */
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if (ret)
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val = par->default_value;
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pr_debug("found %s with value %u\n", par->property, val);
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cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
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(*ncfg)++;
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}
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}
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/**
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* pinconf_generic_parse_dt_config()
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* parse the config properties into generic pinconfig values.
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* @np: node containing the pinconfig properties
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* @configs: array with nconfigs entries containing the generic pinconf values
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* must be freed when no longer necessary.
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* @nconfigs: umber of configurations
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*/
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int pinconf_generic_parse_dt_config(struct device_node *np,
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struct pinctrl_dev *pctldev,
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unsigned long **configs,
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unsigned int *nconfigs)
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{
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unsigned long *cfg;
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unsigned int max_cfg, ncfg = 0;
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int ret;
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if (!np)
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return -EINVAL;
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/* allocate a temporary array big enough to hold one of each option */
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max_cfg = ARRAY_SIZE(dt_params);
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if (pctldev)
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max_cfg += pctldev->desc->num_custom_params;
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cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
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if (pctldev && pctldev->desc->num_custom_params &&
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pctldev->desc->custom_params)
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parse_dt_cfg(np, pctldev->desc->custom_params,
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pctldev->desc->num_custom_params, cfg, &ncfg);
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ret = 0;
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/* no configs found at all */
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if (ncfg == 0) {
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*configs = NULL;
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*nconfigs = 0;
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goto out;
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}
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/*
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* Now limit the number of configs to the real number of
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* found properties.
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*/
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*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
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if (!*configs) {
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ret = -ENOMEM;
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goto out;
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}
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*nconfigs = ncfg;
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out:
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kfree(cfg);
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return ret;
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}
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int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np, struct pinctrl_map **map,
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unsigned *reserved_maps, unsigned *num_maps,
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enum pinctrl_map_type type)
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{
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int ret;
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const char *function;
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struct device *dev = pctldev->dev;
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unsigned long *configs = NULL;
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unsigned num_configs = 0;
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unsigned reserve, strings_count;
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struct property *prop;
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const char *group;
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const char *subnode_target_type = "pins";
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ret = of_property_count_strings(np, "pins");
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if (ret < 0) {
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ret = of_property_count_strings(np, "groups");
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if (ret < 0)
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/* skip this node; may contain config child nodes */
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return 0;
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if (type == PIN_MAP_TYPE_INVALID)
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type = PIN_MAP_TYPE_CONFIGS_GROUP;
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subnode_target_type = "groups";
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} else {
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if (type == PIN_MAP_TYPE_INVALID)
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type = PIN_MAP_TYPE_CONFIGS_PIN;
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}
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strings_count = ret;
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ret = of_property_read_string(np, "function", &function);
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if (ret < 0) {
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/* EINVAL=missing, which is fine since it's optional */
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if (ret != -EINVAL)
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dev_err(dev, "%pOF: could not parse property function\n",
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np);
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function = NULL;
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}
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ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
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&num_configs);
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if (ret < 0) {
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dev_err(dev, "%pOF: could not parse node property\n", np);
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return ret;
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}
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reserve = 0;
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if (function != NULL)
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reserve++;
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if (num_configs)
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reserve++;
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reserve *= strings_count;
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ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
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num_maps, reserve);
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if (ret < 0)
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goto exit;
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of_property_for_each_string(np, subnode_target_type, prop, group) {
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if (function) {
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ret = pinctrl_utils_add_map_mux(pctldev, map,
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reserved_maps, num_maps, group,
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function);
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if (ret < 0)
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goto exit;
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}
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|
|
if (num_configs) {
|
|
ret = pinctrl_utils_add_map_configs(pctldev, map,
|
|
reserved_maps, num_maps, group, configs,
|
|
num_configs, type);
|
|
if (ret < 0)
|
|
goto exit;
|
|
}
|
|
}
|
|
ret = 0;
|
|
|
|
exit:
|
|
kfree(configs);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
|
|
|
|
int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
|
|
struct device_node *np_config, struct pinctrl_map **map,
|
|
unsigned *num_maps, enum pinctrl_map_type type)
|
|
{
|
|
unsigned reserved_maps;
|
|
struct device_node *np;
|
|
int ret;
|
|
|
|
reserved_maps = 0;
|
|
*map = NULL;
|
|
*num_maps = 0;
|
|
|
|
ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
|
|
&reserved_maps, num_maps, type);
|
|
if (ret < 0)
|
|
goto exit;
|
|
|
|
for_each_available_child_of_node(np_config, np) {
|
|
ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
|
|
&reserved_maps, num_maps, type);
|
|
if (ret < 0)
|
|
goto exit;
|
|
}
|
|
return 0;
|
|
|
|
exit:
|
|
pinctrl_utils_free_map(pctldev, *map, *num_maps);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
|
|
|
|
void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
|
|
struct pinctrl_map *map,
|
|
unsigned num_maps)
|
|
{
|
|
pinctrl_utils_free_map(pctldev, map, num_maps);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
|
|
|
|
#endif
|