linux-kernel - [PATCH] Thermal: imx: add clk disable/enable for suspend/resume

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Message-ID: <1420468153-19142-1-git-send-email-b20788@freescale.com>
Date:	Mon, 5 Jan 2015 22:29:13 +0800
From:	Anson Huang <b20788@...escale.com>
To:	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	<rui.zhang@...el.com>, <edubezval@...il.com>
Subject: [PATCH] Thermal: imx: add clk disable/enable for suspend/resume

Thermal sensor's clk is from pll3_usb_otg, per hardware
design requirement, need to make sure pll3_usb_otg is disabled
before STOP mode is entered, otherwise, all PFDs under it may
enter incorrect state, this patch disables pll3_usb_otg before
suspend and enables it after resume.

Signed-off-by: Anson Huang <b20788@...escale.com>
---
 drivers/thermal/imx_thermal.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index 461bf3d..03894da 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -600,6 +600,8 @@ static int imx_thermal_suspend(struct device *dev)
 	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
 	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
 	data->mode = THERMAL_DEVICE_DISABLED;
+	if (!IS_ERR(data->thermal_clk))
+		clk_disable_unprepare(data->thermal_clk);
 
 	return 0;
 }
@@ -609,6 +611,8 @@ static int imx_thermal_resume(struct device *dev)
 	struct imx_thermal_data *data = dev_get_drvdata(dev);
 	struct regmap *map = data->tempmon;
 
+	if (!IS_ERR(data->thermal_clk))
+		clk_prepare_enable(data->thermal_clk);
 	/* Enabled thermal sensor after resume */
 	regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
 	regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
-- 
1.9.1

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