[Patch V2] i2c: imx-lpi2c: add VLLS mode support
From: Gao Pan <hidden>
Date: 2017-01-17 07:11:17
Subsystem:
freescale imx lpi2c driver, i2c subsystem, i2c subsystem host drivers, the rest · Maintainers:
Dong Aisheng, Wolfram Sang, Andi Shyti, Linus Torvalds
When system enters VLLS mode, module power is turned off. As a result, all registers are reset to HW default value. After exiting VLLS mode, registers are still in default mode. As a result, the pinctrl settings are incorrect, which will affect the module function. The patch recovers the pinctrl setting when exit VLLS mode. Signed-off-by: Gao Pan <redacted> --- V2: -drop "#else branch" and IMX_LPI2C_PM completely -pm = &imx_lpi2c_pm drivers/i2c/busses/i2c-imx-lpi2c.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index c62b7cd..dbde95d 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c@@ -636,12 +636,33 @@ static int lpi2c_imx_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int lpi2c_imx_suspend(struct device *dev) +{ + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int lpi2c_imx_resume(struct device *dev) +{ + pinctrl_pm_select_default_state(dev); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(imx_lpi2c_pm, lpi2c_imx_suspend, lpi2c_imx_resume); +#endif + static struct platform_driver lpi2c_imx_driver = { .probe = lpi2c_imx_probe, .remove = lpi2c_imx_remove, .driver = { .name = DRIVER_NAME, .of_match_table = lpi2c_imx_of_match, +#ifdef CONFIG_PM_SLEEP + .pm = &imx_lpi2c_pm, +#endif }, };
--
1.9.1