i2c-s3c2410: Rework device type handling

Reorganize driver a bit to better handle device tree-based systems:

 - move machine type to driver's private structure instead of
   quering platform device variants in runtime

 - replace s3c24xx_i2c_type enum with unsigned int that holds
   bitmask with revision-specific quirks

Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 85e3664..23736ff 100644 (file)
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -44,8 +44,10 @@
 #include <plat/regs-iic.h>
 #include <plat/iic.h>
 
-/* i2c controller state */
+/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */
+#define QUIRK_S3C2440          (1 << 0)
 
+/* i2c controller state */
 enum s3c24xx_i2c_state {
        STATE_IDLE,
        STATE_START,
@@ -54,14 +56,10 @@ enum s3c24xx_i2c_state {
        STATE_STOP
 };
 
-enum s3c24xx_i2c_type {
-       TYPE_S3C2410,
-       TYPE_S3C2440,
-};
-
 struct s3c24xx_i2c {
        spinlock_t              lock;
        wait_queue_head_t       wait;
+       unsigned int            quirks;
        unsigned int            suspended:1;
 
        struct i2c_msg          *msg;
@@ -88,26 +86,40 @@ struct s3c24xx_i2c {
 #endif
 };
 
-/* default platform data removed, dev should always carry data. */
+static struct platform_device_id s3c24xx_driver_ids[] = {
+       {
+               .name           = "s3c2410-i2c",
+               .driver_data    = 0,
+       }, {
+               .name           = "s3c2440-i2c",
+               .driver_data    = QUIRK_S3C2440,
+       }, { },
+};
+MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id s3c24xx_i2c_match[] = {
+       { .compatible = "samsung,s3c2410-i2c", .data = (void *)0 },
+       { .compatible = "samsung,s3c2440-i2c", .data = (void *)QUIRK_S3C2440 },
+       {},
+};
+MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
+#endif
 
-/* s3c24xx_i2c_is2440()
+/* s3c24xx_get_device_quirks
  *
- * return true is this is an s3c2440
+ * Get controller type either from device tree or platform device variant.
 */
 
-static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
+static inline unsigned int s3c24xx_get_device_quirks(struct platform_device *pdev)
 {
-       struct platform_device *pdev = to_platform_device(i2c->dev);
-       enum s3c24xx_i2c_type type;
-
-#ifdef CONFIG_OF
-       if (i2c->dev->of_node)
-               return of_device_is_compatible(i2c->dev->of_node,
-                               "samsung,s3c2440-i2c");
-#endif
+       if (pdev->dev.of_node) {
+               const struct of_device_id *match;
+               match = of_match_node(&s3c24xx_i2c_match, pdev->dev.of_node);
+               return (unsigned int)match->data;
+       }
 
-       type = platform_get_device_id(pdev)->driver_data;
-       return type == TYPE_S3C2440;
+       return platform_get_device_id(pdev)->driver_data;
 }
 
 /* s3c24xx_i2c_master_complete
@@ -676,7 +688,7 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 
        writel(iiccon, i2c->regs + S3C2410_IICCON);
 
-       if (s3c24xx_i2c_is2440(i2c)) {
+       if (i2c->quirks & QUIRK_S3C2440) {
                unsigned long sda_delay;
 
                if (pdata->sda_delay) {
@@ -906,6 +918,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
                goto err_noclk;
        }
 
+       i2c->quirks = s3c24xx_get_device_quirks(pdev);
        if (pdata)
                memcpy(i2c->pdata, pdata, sizeof(*pdata));
        else
@@ -1110,26 +1123,6 @@ static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
 
 /* device driver for platform bus bits */
 
-static struct platform_device_id s3c24xx_driver_ids[] = {
-       {
-               .name           = "s3c2410-i2c",
-               .driver_data    = TYPE_S3C2410,
-       }, {
-               .name           = "s3c2440-i2c",
-               .driver_data    = TYPE_S3C2440,
-       }, { },
-};
-MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
-
-#ifdef CONFIG_OF
-static const struct of_device_id s3c24xx_i2c_match[] = {
-       { .compatible = "samsung,s3c2410-i2c" },
-       { .compatible = "samsung,s3c2440-i2c" },
-       {},
-};
-MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
-#endif
-
 static struct platform_driver s3c24xx_i2c_driver = {
        .probe          = s3c24xx_i2c_probe,
        .remove         = s3c24xx_i2c_remove,