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i2c: imx-lpi2c: add VLLS mode support 

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 <pandy.gao@nxp.com>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
[wsa: added missing include]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Gao Pan 2017-01-17 18:20:55 +08:00 committed by Wolfram Sang
parent 0e1929dede
commit e13fe92bb5
1 changed files with 20 additions and 0 deletions
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20
drivers/i2c/busses/i2c-imx-lpi2c.c
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@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
@ -636,12 +637,31 @@ 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;
}
#endif
static SIMPLE_DEV_PM_OPS(imx_lpi2c_pm, lpi2c_imx_suspend, lpi2c_imx_resume);
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,
.pm = &imx_lpi2c_pm,
},
};