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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>
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@ -28,6 +28,7 @@
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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@ -636,12 +637,31 @@ static int lpi2c_imx_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int lpi2c_imx_suspend(struct device *dev)
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{
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pinctrl_pm_select_sleep_state(dev);
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return 0;
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}
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static int lpi2c_imx_resume(struct device *dev)
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{
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pinctrl_pm_select_default_state(dev);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(imx_lpi2c_pm, lpi2c_imx_suspend, lpi2c_imx_resume);
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static struct platform_driver lpi2c_imx_driver = {
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.probe = lpi2c_imx_probe,
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.remove = lpi2c_imx_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = lpi2c_imx_of_match,
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.pm = &imx_lpi2c_pm,
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},
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};
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