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

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Date:   Mon, 29 Jul 2019 09:30:36 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Yongcai Huang <Anson.Huang@....com>
Cc:     "rui.zhang" <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        NXP Linux Team <Linux-imx@....com>
Subject: Re: [PATCH V2 4/4] thermal: qoriq: Add clock operations

Hi Anson,

On Mon, Jul 29, 2019 at 6:04 AM <Anson.Huang@....com> wrote:
>
> 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.

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@....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 */

In case of failure the TMU clock should be disabled in the error path.

Thanks