[PATCH V3 1/5] thermal: qoriq: Add clock operations

[Anson . Huang]

From: Anson Huang <anson.hu...@nxp.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.hu...@nxp.com>
Reviewed-by: Guido Günther <a...@sigxcpu.org>
---
Changes since V2:
        - move this patch as first patch in the series;
        - add clock disable handling in error path of probe.
---
 drivers/thermal/qoriq_thermal.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
index 7b36493..2893947 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];
 };
@@ -209,6 +211,16 @@ static int qoriq_tmu_probe(struct platform_device *pdev)
                goto err_iomap;
        }
 
+       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 */
@@ -225,6 +237,7 @@ static int qoriq_tmu_probe(struct platform_device *pdev)
        return 0;
 
 err_tmu:
+       clk_disable_unprepare(data->clk);
        iounmap(data->regs);
 
 err_iomap:
@@ -241,6 +254,9 @@ static int qoriq_tmu_remove(struct platform_device *pdev)
        tmu_write(data, TMR_DISABLE, &data->regs->tmr);
 
        iounmap(data->regs);
+
+       clk_disable_unprepare(data->clk);
+
        platform_set_drvdata(pdev, NULL);
 
        return 0;
@@ -257,14 +273,21 @@ static int 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 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