mtd: Add orion_nand devicetree bindings
Allow a NAND chip using the orion_nand driver to be described using devicetree. Changes since last submission (V4) [Addressing comments by]:- * WARN when bank-width is out of range [Andrew Lunn] Changes since last submission (V3):- * Document all parameters [Grant Likely] * Convert bank-width to be in bytes * Add explicit defaults for cle, ale and bank-width Signed-off-by: Jamie Lentin <jm@lentin.co.uk> Signed-off-by: Jason Cooper <jason@lakedaemon.net>hifive-unleashed-5.1
Jamie Lentin
Jason Cooper
parent
9007d10073
commit
a0fabf722c
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@ -0,0 +1,50 @@
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NAND support for Marvell Orion SoC platforms
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Required properties:
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- compatible : "mrvl,orion-nand".
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- reg : Base physical address of the NAND and length of memory mapped
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region
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Optional properties:
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- cle : Address line number connected to CLE. Default is 0
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- ale : Address line number connected to ALE. Default is 1
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- bank-width : Width in bytes of the device. Default is 1
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- chip-delay : Chip dependent delay for transferring data from array to read
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registers in usecs
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The device tree may optionally contain sub-nodes describing partitions of the
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address space. See partition.txt for more detail.
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Example:
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nand@f4000000 {
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#address-cells = <1>;
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#size-cells = <1>;
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cle = <0>;
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ale = <1>;
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bank-width = <1>;
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chip-delay = <25>;
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compatible = "mrvl,orion-nand";
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reg = <0xf4000000 0x400>;
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partition@0 {
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label = "u-boot";
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reg = <0x0000000 0x100000>;
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read-only;
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};
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partition@100000 {
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label = "uImage";
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reg = <0x0100000 0x200000>;
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};
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partition@300000 {
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label = "dtb";
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reg = <0x0300000 0x100000>;
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};
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partition@400000 {
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label = "root";
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reg = <0x0400000 0x7d00000>;
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};
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};
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@ -13,6 +13,7 @@
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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@ -74,11 +75,13 @@ static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
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static int __init orion_nand_probe(struct platform_device *pdev)
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{
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struct mtd_info *mtd;
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struct mtd_part_parser_data ppdata = {};
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struct nand_chip *nc;
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struct orion_nand_data *board;
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struct resource *res;
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void __iomem *io_base;
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int ret = 0;
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u32 val = 0;
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nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
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if (!nc) {
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@ -101,7 +104,32 @@ static int __init orion_nand_probe(struct platform_device *pdev)
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goto no_res;
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}
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board = pdev->dev.platform_data;
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if (pdev->dev.of_node) {
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board = devm_kzalloc(&pdev->dev, sizeof(struct orion_nand_data),
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GFP_KERNEL);
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if (!board) {
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printk(KERN_ERR "orion_nand: failed to allocate board structure.\n");
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ret = -ENOMEM;
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goto no_res;
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}
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if (!of_property_read_u32(pdev->dev.of_node, "cle", &val))
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board->cle = (u8)val;
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else
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board->cle = 0;
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if (!of_property_read_u32(pdev->dev.of_node, "ale", &val))
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board->ale = (u8)val;
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else
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board->ale = 1;
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if (!of_property_read_u32(pdev->dev.of_node,
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"bank-width", &val))
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board->width = (u8)val * 8;
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else
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board->width = 8;
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if (!of_property_read_u32(pdev->dev.of_node,
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"chip-delay", &val))
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board->chip_delay = (u8)val;
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} else
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board = pdev->dev.platform_data;
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mtd->priv = nc;
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mtd->owner = THIS_MODULE;
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@ -115,6 +143,10 @@ static int __init orion_nand_probe(struct platform_device *pdev)
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if (board->chip_delay)
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nc->chip_delay = board->chip_delay;
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WARN(board->width > 16,
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"%d bit bus width out of range",
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board->width);
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if (board->width == 16)
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nc->options |= NAND_BUSWIDTH_16;
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@ -129,8 +161,9 @@ static int __init orion_nand_probe(struct platform_device *pdev)
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}
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mtd->name = "orion_nand";
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ret = mtd_device_parse_register(mtd, NULL, NULL, board->parts,
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board->nr_parts);
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ppdata.of_node = pdev->dev.of_node;
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ret = mtd_device_parse_register(mtd, NULL, &ppdata,
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board->parts, board->nr_parts);
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if (ret) {
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nand_release(mtd);
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goto no_dev;
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@ -161,11 +194,19 @@ static int __devexit orion_nand_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_OF
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static struct of_device_id orion_nand_of_match_table[] = {
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{ .compatible = "mrvl,orion-nand", },
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{},
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};
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#endif
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static struct platform_driver orion_nand_driver = {
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.remove = __devexit_p(orion_nand_remove),
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.driver = {
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.name = "orion_nand",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(orion_nand_of_match_table),
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},
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};
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