Add optional support for i2c bus pin configuration using pinctrl interface
Cc: Ben Dooks <ben-linux@xxxxxxxxx>
Signed-off-by: Thomas Abraham <thomas.abraham@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-s3c2410.c | 19 ++++++++++++++++---
1 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 5ae3b02..f4b2d6f 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -38,6 +38,7 @@
#include <linux/io.h>
#include <linux/of_i2c.h>
#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
#include <asm/irq.h>
@@ -83,6 +84,8 @@ struct s3c24xx_i2c {
struct s3c2410_platform_i2c *pdata;
int gpios[2];
+ struct pinctrl *pctrl;
+ struct pinctrl_state *pctrl_state;
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
#endif
@@ -859,11 +862,17 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
/* inititalise the gpio */
- if (pdata->cfg_gpio)
+ if (pdata->cfg_gpio) {
pdata->cfg_gpio(to_platform_device(i2c->dev));
- else
- if (s3c24xx_i2c_parse_dt_gpio(i2c))
+ } else if (!IS_ERR_OR_NULL(i2c->pctrl) &&
+ !IS_ERR_OR_NULL(i2c->pctrl_state)) {
+ if (pinctrl_select_state(i2c->pctrl, i2c->pctrl_state)) {
+ dev_err(i2c->dev, "failed to configure io-pins\n");
+ return -ENXIO;
+ }
+ } else if (s3c24xx_i2c_parse_dt_gpio(i2c)) {
return -EINVAL;
+ }
/* write slave address */
@@ -1013,6 +1022,10 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
i2c->adap.algo_data = i2c;
i2c->adap.dev.parent = &pdev->dev;
+ i2c->pctrl = devm_pinctrl_get(i2c->dev);
+ if (!IS_ERR_OR_NULL(i2c->pctrl))
+ i2c->pctrl_state = pinctrl_lookup_state(i2c->pctrl, "default");
+
/* initialise the i2c controller */
ret = s3c24xx_i2c_init(i2c);
--
1.6.6.rc2
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