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Date: Fri, 09 Mar 2012 18:04:45 +0100
From: Karol Lewandowski <k.lewandowsk@...sung.com>
To: ben-linux@...ff.org
Cc: thomas.abraham@...aro.org, m.szyprowski@...sung.com,
linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
devicetree-discuss@...ts.ozlabs.org,
linux-samsung-soc@...r.kernel.org, t.stanislaws@...sung.com,
Karol Lewandowski <k.lewandowsk@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 1/2] 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 plain unsigned int that can
hold not only device type but also hw revision-specific quirks
Signed-off-by: Karol Lewandowski <k.lewandowsk@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
drivers/i2c/busses/i2c-s3c2410.c | 56 +++++++++++++------------------------
1 files changed, 20 insertions(+), 36 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 737f721..5b400c6 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -44,8 +44,12 @@
#include <plat/regs-iic.h>
#include <plat/iic.h>
-/* i2c controller state */
+/* type */
+#define TYPE_BITS 0x000000ff
+#define TYPE_S3C2410 0x00000001
+#define TYPE_S3C2440 0x00000002
+/* i2c controller state */
enum s3c24xx_i2c_state {
STATE_IDLE,
STATE_START,
@@ -54,14 +58,10 @@ 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 type;
unsigned int suspended:1;
struct i2c_msg *msg;
@@ -88,28 +88,6 @@ struct s3c24xx_i2c {
#endif
};
-/* default platform data removed, dev should always carry data. */
-
-/* s3c24xx_i2c_is2440()
- *
- * return true is this is an s3c2440
-*/
-
-static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
-{
- 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
-
- type = platform_get_device_id(pdev)->driver_data;
- return type == TYPE_S3C2440;
-}
-
/* s3c24xx_i2c_master_complete
*
* complete the message and wake up the caller, using the given return code,
@@ -676,7 +654,7 @@ 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->type & TYPE_S3C2440) {
unsigned long sda_delay;
if (pdata->sda_delay) {
@@ -847,6 +825,8 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
}
#ifdef CONFIG_OF
+static const struct of_device_id s3c24xx_i2c_match[];
+
/* s3c24xx_i2c_parse_dt
*
* Parse the device tree node and retreive the platform data.
@@ -856,11 +836,16 @@ static void
s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
{
struct s3c2410_platform_i2c *pdata = i2c->pdata;
+ const struct of_device_id *match;
if (!np)
return;
pdata->bus_num = -1; /* i2c bus number is dynamically assigned */
+
+ match = of_match_node(&s3c24xx_i2c_match[0], np);
+ i2c->type = (unsigned int)match->data;
+
of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay);
of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr);
of_property_read_u32(np, "samsung,i2c-max-bus-freq",
@@ -906,9 +891,10 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
goto err_noclk;
}
- if (pdata)
+ if (pdata) {
memcpy(i2c->pdata, pdata, sizeof(*pdata));
- else
+ i2c->type = platform_get_device_id(pdev)->driver_data;
+ } else
s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c);
strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
@@ -1123,13 +1109,11 @@ 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" },
+ { .compatible = "samsung,s3c2410-i2c", .data = (void *)TYPE_S3C2410 },
+ { .compatible = "samsung,s3c2440-i2c", .data = (void *)TYPE_S3C2440 },
{},
};
MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
-#else
-#define s3c24xx_i2c_match NULL
#endif
static struct platform_driver s3c24xx_i2c_driver = {
@@ -1140,7 +1124,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
.owner = THIS_MODULE,
.name = "s3c-i2c",
.pm = S3C24XX_DEV_PM_OPS,
- .of_match_table = s3c24xx_i2c_match,
+ .of_match_table = of_match_ptr(s3c24xx_i2c_match),
},
};
--
1.7.9
--
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