linux-kernel - [PATCH V2 4/4] thermal: qoriq: Add clock operations

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Date:   Mon, 29 Jul 2019 16:39:15 +0800
From:   Anson.Huang@....com
To:     rui.zhang@...el.com, edubezval@...il.com,
        daniel.lezcano@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH V2 4/4] thermal: qoriq: Add clock operations

From: Anson Huang <Anson.Huang@....com>

Some platforms like i.MX8MQ has clock control for this module,
need to add clock operations to make sure the driver is working
properly.

Signed-off-by: Anson Huang <Anson.Huang@....com>
Reviewed-by: Guido Günther <agx@...xcpu.org>
---
Changes since V1:
	- use devm_clk_get_optional() instead of devm_clk_get().
---
 drivers/thermal/qoriq_thermal.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
index 2b2f79b..0ae45c0 100644
--- a/drivers/thermal/qoriq_thermal.c
+++ b/drivers/thermal/qoriq_thermal.c
@@ -2,6 +2,7 @@
 //
 // Copyright 2016 Freescale Semiconductor, Inc.
 
+#include <linux/clk.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/err.h>
@@ -72,6 +73,7 @@ struct qoriq_sensor {
 
 struct qoriq_tmu_data {
 	struct qoriq_tmu_regs __iomem *regs;
+	struct clk *clk;
 	bool little_endian;
 	struct qoriq_sensor	*sensor[SITES_MAX];
 };
@@ -208,6 +210,16 @@ static int qoriq_tmu_probe(struct platform_device *pdev)
 		return PTR_ERR(data->regs);
 	}
 
+	data->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(data->clk))
+		return PTR_ERR(data->clk);
+
+	ret = clk_prepare_enable(data->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable clock\n");
+		return ret;
+	}
+
 	qoriq_tmu_init_device(data);	/* TMU initialization */
 
 	ret = qoriq_tmu_calibration(pdev);	/* TMU calibration */
@@ -235,6 +247,8 @@ static int qoriq_tmu_remove(struct platform_device *pdev)
 	/* Disable monitoring */
 	tmu_write(data, TMR_DISABLE, &data->regs->tmr);
 
+	clk_disable_unprepare(data->clk);
+
 	platform_set_drvdata(pdev, NULL);
 
 	return 0;
@@ -250,14 +264,21 @@ static int __maybe_unused qoriq_tmu_suspend(struct device *dev)
 	tmr &= ~TMR_ME;
 	tmu_write(data, tmr, &data->regs->tmr);
 
+	clk_disable_unprepare(data->clk);
+
 	return 0;
 }
 
 static int __maybe_unused qoriq_tmu_resume(struct device *dev)
 {
 	u32 tmr;
+	int ret;
 	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
 
+	ret = clk_prepare_enable(data->clk);
+	if (ret)
+		return ret;
+
 	/* Enable monitoring */
 	tmr = tmu_read(data, &data->regs->tmr);
 	tmr |= TMR_ME;
-- 
2.7.4