i2c: pxa: add OF support

Append these properties in below.
mrvl,i2c-polling
mrvl,i2c-fast-mode

Still keep slave, slave_addr and class in platform data.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 74 insertions, 21 deletions

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index d60364650990..f6733267fa9c 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -29,6 +29,8 @@
 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/i2c-pxa.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/of_i2c.h>
 #include <linux/platform_device.h>
 #include <linux/err.h>
@@ -1044,23 +1046,60 @@ static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
         .functionality  = i2c_pxa_functionality,
 };
 
-static int i2c_pxa_probe(struct platform_device *dev)
+static struct of_device_id i2c_pxa_dt_ids[] = {
+        { .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
+        { .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
+        { .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA2XX },
+        {}
+};
+MODULE_DEVICE_TABLE(of, i2c_pxa_dt_ids);
+
+static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
+                            enum pxa_i2c_types *i2c_types)
 {
-        struct pxa_i2c *i2c;
-        struct resource *res;
-        struct i2c_pxa_platform_data *plat = dev->dev.platform_data;
-        const struct platform_device_id *id = platform_get_device_id(dev);
-        enum pxa_i2c_types i2c_type = id->driver_data;
+        struct device_node *np = pdev->dev.of_node;
+        const struct of_device_id *of_id =
+                        of_match_device(i2c_pxa_dt_ids, &pdev->dev);
         int ret;
-        int irq;
 
-        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
-        irq = platform_get_irq(dev, 0);
-        if (res == NULL || irq < 0)
-                return -ENODEV;
+        if (!of_id)
+                return 1;
+        ret = of_alias_get_id(np, "i2c");
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
+                return ret;
+        }
+        pdev->id = ret;
+        if (of_get_property(np, "mrvl,i2c-polling", NULL))
+                i2c->use_pio = 1;
+        if (of_get_property(np, "mrvl,i2c-fast-mode", NULL))
+                i2c->fast_mode = 1;
+        *i2c_types = (u32)(of_id->data);
+        return 0;
+}
 
-        if (!request_mem_region(res->start, resource_size(res), res->name))
-                return -ENOMEM;
+static int i2c_pxa_probe_pdata(struct platform_device *pdev,
+                               struct pxa_i2c *i2c,
+                               enum pxa_i2c_types *i2c_types)
+{
+        struct i2c_pxa_platform_data *plat = pdev->dev.platform_data;
+        const struct platform_device_id *id = platform_get_device_id(pdev);
+
+        *i2c_types = id->driver_data;
+        if (plat) {
+                i2c->use_pio = plat->use_pio;
+                i2c->fast_mode = plat->fast_mode;
+        }
+        return 0;
+}
+
+static int i2c_pxa_probe(struct platform_device *dev)
+{
+        struct i2c_pxa_platform_data *plat = dev->dev.platform_data;
+        enum pxa_i2c_types i2c_type;
+        struct pxa_i2c *i2c;
+        struct resource *res = NULL;
+        int ret, irq;
 
         i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
         if (!i2c) {
@@ -1068,6 +1107,24 @@ static int i2c_pxa_probe(struct platform_device *dev)
                 goto emalloc;
         }
 
+        ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
+        if (ret > 0)
+                ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
+        if (ret < 0)
+                goto eclk;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        irq = platform_get_irq(dev, 0);
+        if (res == NULL || irq < 0) {
+                ret = -ENODEV;
+                goto eclk;
+        }
+
+        if (!request_mem_region(res->start, resource_size(res), res->name)) {
+                ret = -ENOMEM;
+                goto eclk;
+        }
+
         i2c->adap.owner   = THIS_MODULE;
         i2c->adap.retries = 5;
 
@@ -1109,21 +1166,16 @@ static int i2c_pxa_probe(struct platform_device *dev)
 
         i2c->slave_addr = I2C_PXA_SLAVE_ADDR;
 
-#ifdef CONFIG_I2C_PXA_SLAVE
         if (plat) {
+#ifdef CONFIG_I2C_PXA_SLAVE
                 i2c->slave_addr = plat->slave_addr;
                 i2c->slave = plat->slave;
-        }
 #endif
-
-        clk_enable(i2c->clk);
-
-        if (plat) {
                 i2c->adap.class = plat->class;
-                i2c->use_pio = plat->use_pio;
-                i2c->fast_mode = plat->fast_mode;
         }
 
+        clk_enable(i2c->clk);
+
         if (i2c->use_pio) {
                 i2c->adap.algo = &i2c_pxa_pio_algorithm;
         } else {
@@ -1234,6 +1286,7 @@ static struct platform_driver i2c_pxa_driver = {
                 .name   = "pxa2xx-i2c",
                 .owner  = THIS_MODULE,
                 .pm     = I2C_PXA_DEV_PM_OPS,
+                .of_match_table = i2c_pxa_dt_ids,
         },
         .id_table       = i2c_pxa_id_table,
 };