ARM: at91: atmel-ssc: add device tree support
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 <voice.shen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
index f40abd8..a769719 100644
--- a/drivers/misc/atmel-ssc.c
+++ b/drivers/misc/atmel-ssc.c
@@ -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 @@
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 @@
}
};
+#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 @@
}
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 @@
.driver = {
.name = "ssc",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(atmel_ssc_dt_ids),
},
.id_table = atmel_ssc_devtypes,
.probe = ssc_probe,