Re: [PATCH v8 03/16] hwmon: Make use of devm_clk_get_enabled()

[Guenter Roeck <linux@xxxxxxxxxxxx>]

On 3/14/22 07:16, Uwe Kleine-König wrote:
> Several drivers manually register a devm handler to disable their clk.
> Convert them to devm_clk_get_enabled().
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>

Let's see if it goes anywhere this time.

Acked-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
>   drivers/hwmon/axi-fan-control.c | 15 +--------------
>   drivers/hwmon/ltc2947-core.c    | 17 +----------------
>   drivers/hwmon/mr75203.c         | 26 +-------------------------
>   drivers/hwmon/sparx5-temp.c     | 19 +------------------
>   4 files changed, 4 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/hwmon/axi-fan-control.c b/drivers/hwmon/axi-fan-control.c
> index d2092c17d993..ce404ed9c53e 100644
> --- a/drivers/hwmon/axi-fan-control.c
> +++ b/drivers/hwmon/axi-fan-control.c
> @@ -393,11 +393,6 @@ static int axi_fan_control_init(struct axi_fan_control_data *ctl,
>   	return ret;
>   }
>   
> -static void axi_fan_control_clk_disable(void *clk)
> -{
> -	clk_disable_unprepare(clk);
> -}
> -
>   static const struct hwmon_channel_info *axi_fan_control_info[] = {
>   	HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT),
>   	HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_LABEL),
> @@ -477,20 +472,12 @@ static int axi_fan_control_probe(struct platform_device *pdev)
>   	if (IS_ERR(ctl->base))
>   		return PTR_ERR(ctl->base);
>   
> -	clk = devm_clk_get(&pdev->dev, NULL);
> +	clk = devm_clk_get_enabled(&pdev->dev, NULL);
>   	if (IS_ERR(clk)) {
>   		dev_err(&pdev->dev, "clk_get failed with %ld\n", PTR_ERR(clk));
>   		return PTR_ERR(clk);
>   	}
>   
> -	ret = clk_prepare_enable(clk);
> -	if (ret)
> -		return ret;
> -
> -	ret = devm_add_action_or_reset(&pdev->dev, axi_fan_control_clk_disable, clk);
> -	if (ret)
> -		return ret;
> -
>   	ctl->clk_rate = clk_get_rate(clk);
>   	if (!ctl->clk_rate)
>   		return -EINVAL;
> diff --git a/drivers/hwmon/ltc2947-core.c b/drivers/hwmon/ltc2947-core.c
> index 5423466de697..626f5bf2c9c7 100644
> --- a/drivers/hwmon/ltc2947-core.c
> +++ b/drivers/hwmon/ltc2947-core.c
> @@ -956,13 +956,6 @@ static struct attribute *ltc2947_attrs[] = {
>   };
>   ATTRIBUTE_GROUPS(ltc2947);
>   
> -static void ltc2947_clk_disable(void *data)
> -{
> -	struct clk *extclk = data;
> -
> -	clk_disable_unprepare(extclk);
> -}
> -
>   static int ltc2947_setup(struct ltc2947_data *st)
>   {
>   	int ret;
> @@ -989,7 +982,7 @@ static int ltc2947_setup(struct ltc2947_data *st)
>   		return ret;
>   
>   	/* check external clock presence */
> -	extclk = devm_clk_get_optional(st->dev, NULL);
> +	extclk = devm_clk_get_optional_enabled(st->dev, NULL);
>   	if (IS_ERR(extclk))
>   		return dev_err_probe(st->dev, PTR_ERR(extclk),
>   				     "Failed to get external clock\n");
> @@ -1007,14 +1000,6 @@ static int ltc2947_setup(struct ltc2947_data *st)
>   			return -EINVAL;
>   		}
>   
> -		ret = clk_prepare_enable(extclk);
> -		if (ret)
> -			return ret;
> -
> -		ret = devm_add_action_or_reset(st->dev, ltc2947_clk_disable,
> -					       extclk);
> -		if (ret)
> -			return ret;
>   		/* as in table 1 of the datasheet */
>   		if (rate_hz >= LTC2947_CLK_MIN && rate_hz <= 1000000)
>   			pre = 0;
> diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
> index 1ba1e3145969..0c691f291a64 100644
> --- a/drivers/hwmon/mr75203.c
> +++ b/drivers/hwmon/mr75203.c
> @@ -461,24 +461,6 @@ static int pvt_get_regmap(struct platform_device *pdev, char *reg_name,
>   	return 0;
>   }
>   
> -static void pvt_clk_disable(void *data)
> -{
> -	struct pvt_device *pvt = data;
> -
> -	clk_disable_unprepare(pvt->clk);
> -}
> -
> -static int pvt_clk_enable(struct device *dev, struct pvt_device *pvt)
> -{
> -	int ret;
> -
> -	ret = clk_prepare_enable(pvt->clk);
> -	if (ret)
> -		return ret;
> -
> -	return devm_add_action_or_reset(dev, pvt_clk_disable, pvt);
> -}
> -
>   static void pvt_reset_control_assert(void *data)
>   {
>   	struct pvt_device *pvt = data;
> @@ -515,16 +497,10 @@ static int mr75203_probe(struct platform_device *pdev)
>   	if (ret)
>   		return ret;
>   
> -	pvt->clk = devm_clk_get(dev, NULL);
> +	pvt->clk = devm_clk_get_enabled(dev, NULL);
>   	if (IS_ERR(pvt->clk))
>   		return dev_err_probe(dev, PTR_ERR(pvt->clk), "failed to get clock\n");
>   
> -	ret = pvt_clk_enable(dev, pvt);
> -	if (ret) {
> -		dev_err(dev, "failed to enable clock\n");
> -		return ret;
> -	}
> -
>   	pvt->rst = devm_reset_control_get_exclusive(dev, NULL);
>   	if (IS_ERR(pvt->rst))
>   		return dev_err_probe(dev, PTR_ERR(pvt->rst),
> diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
> index 98be48e3a22a..04fd8505e5d6 100644
> --- a/drivers/hwmon/sparx5-temp.c
> +++ b/drivers/hwmon/sparx5-temp.c
> @@ -26,13 +26,6 @@ struct s5_hwmon {
>   	struct clk *clk;
>   };
>   
> -static void s5_temp_clk_disable(void *data)
> -{
> -	struct clk *clk = data;
> -
> -	clk_disable_unprepare(clk);
> -}
> -
>   static void s5_temp_enable(struct s5_hwmon *hwmon)
>   {
>   	u32 val = readl(hwmon->base + TEMP_CFG);
> @@ -113,7 +106,6 @@ static int s5_temp_probe(struct platform_device *pdev)
>   {
>   	struct device *hwmon_dev;
>   	struct s5_hwmon *hwmon;
> -	int ret;
>   
>   	hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
>   	if (!hwmon)
> @@ -123,19 +115,10 @@ static int s5_temp_probe(struct platform_device *pdev)
>   	if (IS_ERR(hwmon->base))
>   		return PTR_ERR(hwmon->base);
>   
> -	hwmon->clk = devm_clk_get(&pdev->dev, NULL);
> +	hwmon->clk = devm_clk_get_enabled(&pdev->dev, NULL);
>   	if (IS_ERR(hwmon->clk))
>   		return PTR_ERR(hwmon->clk);
>   
> -	ret = clk_prepare_enable(hwmon->clk);
> -	if (ret)
> -		return ret;
> -
> -	ret = devm_add_action_or_reset(&pdev->dev, s5_temp_clk_disable,
> -				       hwmon->clk);
> -	if (ret)
> -		return ret;
> -
>   	s5_temp_enable(hwmon);
>   
>   	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,