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Commit e13fe92b authored by Gao Pan's avatar Gao Pan Committed by Wolfram Sang
Browse files

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: default avatarGao Pan <pandy.gao@nxp.com>
Reviewed-by: default avatarVladimir Zapolskiy <vz@mleia.com>
[wsa: added missing include]
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 0e1929de

drivers/i2c/busses/i2c-imx-lpi2c.c

+20 −0
Original line number Diff line number Diff line
@@ -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,

	},

};