Hi Anson,
On Mon, Jul 29, 2019 at 6:04 AM <Anson.Huang@xxxxxxx> wrote:
>
> From: Anson Huang <Anson.Huang@xxxxxxx>
>
> Some platforms like i.MX8MQ has clock control for this module,
> need to add clock operations to make sure the driver is working
> properly.
I haven't seen this series earlier, and I have sent a similar patch
for Guido to test.
Since this patch solves a hang problem, I would suggest that this one
becomes the first of the series.
Also, the "clk: imx8mq: Remove CLK_IS_CRITICAL flag for
IMX8MQ_CLK_TMU_ROOT" should only be applied after this one in order to
avoid the hang.
>
> Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> Reviewed-by: Guido Günther <agx@xxxxxxxxxxx>
> ---
> 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 */
In case of failure the TMU clock should be disabled in the error path.
Thanks
