linux-kernel - Re: [PATCH 1/6] thermal/drivers/sun8i: add gpadc clock

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Message-ID: <aAIPUcS_cNRHoxwq@mai.linaro.org>
Date: Fri, 18 Apr 2025 10:37:37 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: iuncuim <iuncuim@...il.com>
Cc: Vasily Khoruzhick <anarsoul@...il.com>,
	Yangtao Li <tiny.windzz@...il.com>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Andre Przywara <andre.przywara@....com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Piotr Oniszczuk <piotr.oniszczuk@...il.com>
Subject: Re: [PATCH 1/6] thermal/drivers/sun8i: add gpadc clock

On Fri, Apr 11, 2025 at 08:38:21AM +0800, Mikhail Kalashnikov wrote:
> From: Mikhail Kalashnikov <iuncuim@...il.com>
> 
> Some processors (e.g. Allwinner A523) require GPADC clocking activation for
> temperature sensors to work. So let's add support for enabling it.
> 
> Signed-off-by: Mikhail Kalashnikov <iuncuim@...il.com>
> ---
>  drivers/thermal/sun8i_thermal.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> index 226747906..1f3908a60 100644
> --- a/drivers/thermal/sun8i_thermal.c
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -66,8 +66,9 @@ struct tsensor {
>  };
>  
>  struct ths_thermal_chip {
> -	bool            has_mod_clk;
> -	bool            has_bus_clk_reset;
> +	bool		has_gpadc_clk;
> +	bool		has_mod_clk;
> +	bool		has_bus_clk_reset;
>  	bool		needs_sram;
>  	int		sensor_num;
>  	int		offset;
> @@ -89,7 +90,8 @@ struct ths_device {
>  	struct regmap_field			*sram_regmap_field;
>  	struct reset_control			*reset;
>  	struct clk				*bus_clk;
> -	struct clk                              *mod_clk;
> +	struct clk				*mod_clk;
> +	struct clk				*gpadc_clk;
>  	struct tsensor				sensor[MAX_SENSOR_NUM];
>  };
>  
> @@ -417,6 +419,16 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
>  	if (ret)
>  		return ret;
>  
> +	if (tmdev->chip->has_gpadc_clk) {
> +		tmdev->gpadc_clk = devm_clk_get_enabled(&pdev->dev, "gpadc");
> +		if (IS_ERR(tmdev->gpadc_clk))
> +			return PTR_ERR(tmdev->gpadc_clk);

			return dev_err_probe();

> +	}
> +
> +	ret = clk_prepare_enable(tmdev->gpadc_clk);
> +	if (ret)
> +		return ret;
> +

Why calling clk_prepare_enable() ? devm_clk_get_enabled() did the job no ?

>  	if (tmdev->chip->needs_sram) {
>  		struct regmap *regmap;
>  
> -- 
> 2.49.0
> 

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