linux-kernel - Re: [PATCH v2 07/26] thermal/drivers/exynos: Use generic thermal_zone_get

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Date:   Fri, 12 Aug 2022 13:01:35 +0300
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rafael@...nel.org
Cc:     rui.zhang@...el.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "open list:SAMSUNG THERMAL DRIVER" 
        <linux-samsung-soc@...r.kernel.org>,
        "moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 07/26] thermal/drivers/exynos: Use generic
 thermal_zone_get_trip() function

On 10/08/2022 01:04, Daniel Lezcano wrote:
> The thermal framework gives the possibility to register the trip
> points with the thermal zone. When that is done, no get_trip_* ops are
> needed and they can be removed.
> 
> Convert ops content logic into generic trip points and register them with the
> thermal zone.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/thermal/samsung/exynos_tmu.c | 41 ++++++++++------------------
>  1 file changed, 15 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 51874d0a284c..5204e343d5b0 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -260,16 +260,8 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>  {
>  	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>  	struct thermal_zone_device *tzd = data->tzd;
> -	const struct thermal_trip * const trips =
> -		of_thermal_get_trip_points(tzd);
>  	unsigned int status;
> -	int ret = 0, temp, hyst;
> -
> -	if (!trips) {
> -		dev_err(&pdev->dev,
> -			"Cannot get trip points from device tree!\n");
> -		return -ENODEV;
> -	}
> +	int ret = 0, temp;
>  
>  	if (data->soc != SOC_ARCH_EXYNOS5433) /* FIXME */
>  		ret = tzd->ops->get_crit_temp(tzd, &temp);
> @@ -303,19 +295,16 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>  
>  		/* Write temperature code for rising and falling threshold */
>  		for (i = 0; i < ntrips; i++) {
> -			/* Write temperature code for rising threshold */
> -			ret = tzd->ops->get_trip_temp(tzd, i, &temp);
> -			if (ret)
> -				goto err;
> -			temp /= MCELSIUS;
> -			data->tmu_set_trip_temp(data, i, temp);
>  
> -			/* Write temperature code for falling threshold */
> -			ret = tzd->ops->get_trip_hyst(tzd, i, &hyst);
> +			struct thermal_trip trip;
> +			
> +			ret = thermal_zone_get_trip(tzd, i, &trip);
>  			if (ret)
>  				goto err;
> -			hyst /= MCELSIUS;
> -			data->tmu_set_trip_hyst(data, i, temp, hyst);
> +
> +			data->tmu_set_trip_temp(data, i, trip.temperature / MCELSIUS);
> +			data->tmu_set_trip_hyst(data, i, trip.temperature / MCELSIUS,
> +						trip.hysteresis / MCELSIUS);
>  		}
>  
>  		data->tmu_clear_irqs(data);
> @@ -360,21 +349,21 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
>  }
>  
>  static void exynos4210_tmu_set_trip_temp(struct exynos_tmu_data *data,
> -					 int trip, u8 temp)
> +					 int trip_id, u8 temp)
>  {
> -	const struct thermal_trip * const trips =
> -		of_thermal_get_trip_points(data->tzd);
> +	struct thermal_trip trip;
>  	u8 ref, th_code;
>  
> -	ref = trips[0].temperature / MCELSIUS;
> -
> -	if (trip == 0) {
> +	thermal_zone_get_trip(data->tzd, 0, &trip);

This can return error and trip will be uninitialized.


Best regards,
Krzysztof