openwrt/target/linux/layerscape/patches-5.4/808-i2c-0003-MLK-11403-I2C-imx-restore-pin-setting-for-i2c.patch

From b862ceba838786ac81aa6a295ad91a54aff6909d Mon Sep 17 00:00:00 2001
From: Gao Pan <b54642@freescale.com>
Date: Tue, 25 Aug 2015 14:00:32 +0800
Subject: [PATCH] MLK-11403: I2C: imx: restore pin setting for i2c

restore pin setting for i2c in suspend/resume

Signed-off-by: Gao Pan <gaopan@freescale.com>
(Vipul: Fixed merge conflicts)
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
(cherry picked from commit 42b5aa1d72c09015d435459c6a59022255e3ef21)
---
 drivers/i2c/busses/i2c-imx.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -1257,7 +1257,8 @@ static int __maybe_unused i2c_imx_runtim
 {
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
 
-	clk_disable(i2c_imx->clk);
+	clk_disable_unprepare(i2c_imx->clk);
+	pinctrl_pm_select_sleep_state(dev);
 
 	return 0;
 }
@@ -1267,14 +1268,28 @@ static int __maybe_unused i2c_imx_runtim
 	struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
 	int ret;
 
-	ret = clk_enable(i2c_imx->clk);
+	pinctrl_pm_select_default_state(dev);
+	ret = clk_prepare_enable(i2c_imx->clk);
 	if (ret)
 		dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);
 
 	return ret;
 }
 
+static int i2c_imx_suspend(struct device *dev)
+{
+	pinctrl_pm_select_sleep_state(dev);
+	return 0;
+}
+
+static int i2c_imx_resume(struct device *dev)
+{
+	pinctrl_pm_select_default_state(dev);
+	return 0;
+}
+
 static const struct dev_pm_ops i2c_imx_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(i2c_imx_suspend, i2c_imx_resume)
 	SET_RUNTIME_PM_OPS(i2c_imx_runtime_suspend,
 			   i2c_imx_runtime_resume, NULL)
 };