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ARM: at91: atmel-ssc: add device tree support

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Add atmel-ssc for device tree support

Match "atmel,at91rm9200-ssc" for using pdc for data transfer
Match "atmel,at91sam9g45-ssc" for using dma for data transfer

Signed-off-by: Bo Shen <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Bo Shen 2012-11-07 11:41:41 +08:00 • committed by Mark Brown
commit 099343c64e
13 changed files with 123 additions and 3 deletions
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49
drivers/misc/atmel-ssc.c
View file

@ -18,6 +18,8 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
/* Serialize access to ssc_list and user count */
static DEFINE_SPINLOCK(user_lock);
static LIST_HEAD(ssc_list);
@ -29,7 +31,13 @@ struct ssc_device *ssc_request(unsigned int ssc_num)
spin_lock(&user_lock);
list_for_each_entry(ssc, &ssc_list, list) {
if (ssc->pdev->id == ssc_num) {
if (ssc->pdev->dev.of_node) {
if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc")
== ssc_num) {
ssc_valid = 1;
break;
}
} else if (ssc->pdev->id == ssc_num) {
ssc_valid = 1;
break;
}
@ -88,10 +96,41 @@ static const struct platform_device_id atmel_ssc_devtypes[] = {
}
};
#ifdef CONFIG_OF
static const struct of_device_id atmel_ssc_dt_ids[] = {
{
.compatible = "atmel,at91rm9200-ssc",
.data = &at91rm9200_config,
}, {
.compatible = "atmel,at91sam9g45-ssc",
.data = &at91sam9g45_config,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, atmel_ssc_dt_ids);
#endif
static inline const struct atmel_ssc_platform_data * __init
atmel_ssc_get_driver_data(struct platform_device *pdev)
{
if (pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(atmel_ssc_dt_ids, pdev->dev.of_node);
if (match == NULL)
return NULL;
return match->data;
}
return (struct atmel_ssc_platform_data *)
platform_get_device_id(pdev)->driver_data;
}
static int ssc_probe(struct platform_device *pdev)
{
struct resource *regs;
struct ssc_device *ssc;
const struct atmel_ssc_platform_data *plat_dat;
ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);
if (!ssc) {
@ -100,8 +139,11 @@ static int ssc_probe(struct platform_device *pdev)
}
ssc->pdev = pdev;
ssc->pdata = (struct atmel_ssc_platform_data *)
platform_get_device_id(pdev)->driver_data;
plat_dat = atmel_ssc_get_driver_data(pdev);
if (!plat_dat)
return -ENODEV;
ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
@ -160,6 +202,7 @@ static struct platform_driver ssc_driver = {
.driver = {
.name = "ssc",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(atmel_ssc_dt_ids),
},
.id_table = atmel_ssc_devtypes,
.probe = ssc_probe,