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mtd: Add device-tree support to fsmc_nand

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This patch adds support to configure the FSMC NAND driver (used amongst
others on SPEAr platforms) via device-tree instead of platform_data.

Signed-off-by: Stefan Roese <[email protected]>
Signed-off-by: Artem Bityutskiy <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
This commit is contained in:
Stefan Roese 2012-03-16 10:19:31 +01:00 • committed by David Woodhouse
commit eea628199d
3 changed files with 91 additions and 3 deletions
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57
drivers/mtd/nand/fsmc_nand.c
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@ -31,6 +31,7 @@
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/mtd/partitions.h>
#include <linux/io.h>
#include <linux/slab.h>
@ -854,6 +855,38 @@ static bool filter(struct dma_chan *chan, void *slave)
return true;
}
#ifdef CONFIG_OF
static int __devinit fsmc_nand_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
{
struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
u32 val;
/* Set default NAND width to 8 bits */
pdata->width = 8;
if (!of_property_read_u32(np, "bank-width", &val)) {
if (val == 2) {
pdata->width = 16;
} else if (val != 1) {
dev_err(&pdev->dev, "invalid bank-width %u\n", val);
return -EINVAL;
}
}
of_property_read_u32(np, "st,ale-off", &pdata->ale_off);
of_property_read_u32(np, "st,cle-off", &pdata->cle_off);
if (of_get_property(np, "nand-skip-bbtscan", NULL))
pdata->options = NAND_SKIP_BBTSCAN;
return 0;
}
#else
static int __devinit fsmc_nand_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
{
return -ENOSYS;
}
#endif
/*
* fsmc_nand_probe - Probe function
* @pdev: platform device structure
@ -861,6 +894,8 @@ static bool filter(struct dma_chan *chan, void *slave)
static int __init fsmc_nand_probe(struct platform_device *pdev)
{
struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node __maybe_unused *np = pdev->dev.of_node;
struct mtd_part_parser_data ppdata = {};
struct fsmc_nand_data *host;
struct mtd_info *mtd;
struct nand_chip *nand;
@ -870,6 +905,16 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
u32 pid;
int i;
if (np) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
pdev->dev.platform_data = pdata;
ret = fsmc_nand_probe_config_dt(pdev, np);
if (ret) {
dev_err(&pdev->dev, "no platform data\n");
return -ENODEV;
}
}
if (!pdata) {
dev_err(&pdev->dev, "platform data is NULL\n");
return -EINVAL;
@ -1113,7 +1158,8 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
* Check for partition info passed
*/
host->mtd.name = "nand";
ret = mtd_device_parse_register(&host->mtd, NULL, NULL,
ppdata.of_node = np;
ret = mtd_device_parse_register(&host->mtd, NULL, &ppdata,
host->partitions, host->nr_partitions);
if (ret)
goto err_probe;
@ -1183,11 +1229,20 @@ static int fsmc_nand_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(fsmc_nand_pm_ops, fsmc_nand_suspend, fsmc_nand_resume);
#endif
#ifdef CONFIG_OF
static const struct of_device_id fsmc_nand_id_table[] = {
{ .compatible = "st,spear600-fsmc-nand" },
{}
};
MODULE_DEVICE_TABLE(of, fsmc_nand_id_table);
#endif
static struct platform_driver fsmc_nand_driver = {
.remove = fsmc_nand_remove,
.driver = {
.owner = THIS_MODULE,
.name = "fsmc-nand",
.of_match_table = of_match_ptr(fsmc_nand_id_table),
#ifdef CONFIG_PM
.pm = &fsmc_nand_pm_ops,
#endif