i2c: omap: Add calls for pinctrl state select

This adds calls to pinctrl subsystem in order to switch pin states
on suspend/resume if you provide a "sleep" state in DT.

If no "sleep" state is provided in the DT, these calls turn
to NOPs, so we don't need error checking here.
Signed-off-by: Pascal Huerst <pascal.huerst@gmail.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-omap.c

@@ -38,6 +38,7 @@
 #include <linux/slab.h>
 #include <linux/i2c-omap.h>
 #include <linux/pm_runtime.h>
+#include <linux/pinctrl/consumer.h>
 
 /* I2C controller revisions */
 #define OMAP_I2C_OMAP1_REV_2		0x20
@@ -1423,6 +1424,8 @@ static int omap_i2c_runtime_suspend(struct device *dev)
 		omap_i2c_read_reg(_dev, OMAP_I2C_STAT_REG);
 	}
 
+	pinctrl_pm_select_sleep_state(dev);
+
 	return 0;
 }
 
@@ -1431,6 +1434,8 @@ static int omap_i2c_runtime_resume(struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct omap_i2c_dev *_dev = platform_get_drvdata(pdev);
 
+	pinctrl_pm_select_default_state(dev);
+
 	if (!_dev->regs)
 		return 0;