linux-kernel - Re: [DMARC error][DKIM error] [PATCH v7 1/2] pwm: meson: Add support for Amlogic S4 PWM

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Date: Wed, 5 Jun 2024 15:12:54 +0300
From: George Stark <gnstark@...utedevices.com>
To: <kelvin.zhang@...ogic.com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>, Jerome Brunet
	<jbrunet@...libre.com>, Kevin Hilman <khilman@...libre.com>, Neil Armstrong
	<neil.armstrong@...aro.org>, Uwe Kleine-König
	<u.kleine-koenig@...gutronix.de>, Conor Dooley <conor+dt@...nel.org>,
	<linux-pwm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, Junyi Zhao <junyi.zhao@...ogic.com>
Subject: Re: [DMARC error][DKIM error] [PATCH v7 1/2] pwm: meson: Add support
 for Amlogic S4 PWM

Hello Kelvin, Junyi

On 6/5/24 05:44, Kelvin Zhang via B4 Relay wrote:
> From: Junyi Zhao <junyi.zhao@...ogic.com>
> 
> Add support for Amlogic S4 PWM.
> 
> Signed-off-by: Junyi Zhao <junyi.zhao@...ogic.com>
> Signed-off-by: Kelvin Zhang <kelvin.zhang@...ogic.com>
> ---
>   drivers/pwm/pwm-meson.c | 36 ++++++++++++++++++++++++++++++++++++
>   1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index b2f97dfb01bb..4f01847525b2 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -460,6 +460,34 @@ static int meson_pwm_init_channels_meson8b_v2(struct pwm_chip *chip)
>   	return meson_pwm_init_clocks_meson8b(chip, mux_parent_data);
>   }
>   
> +static void meson_pwm_s4_put_clk(void *data)
> +{
> +	struct clk *clk = data;
> +
> +	clk_put(clk);
> +}
> +
> +static int meson_pwm_init_channels_s4(struct pwm_chip *chip)
> +{
> +	struct device *dev = pwmchip_parent(chip);
> +	struct device_node *np = dev->of_node;
> +	struct meson_pwm *meson = to_meson_pwm(chip);
> +	int i, ret;
> +
> +	for (i = 0; i < MESON_NUM_PWMS; i++) {
> +		meson->channels[i].clk = of_clk_get(np, i);
> +		if (IS_ERR(meson->channels[i].clk)) {
> +			ret = PTR_ERR(meson->channels[i].clk);
> +			dev_err_probe(dev, ret, "Failed to get clk\n");
> +			return ret;
> +		}
> +		devm_add_action_or_reset(dev, meson_pwm_s4_put_clk,
> +					 meson->channels[i].clk);

devm_add_action_or_reset() result should be checked

> +	}
> +
> +	return 0;
> +}

You can rewrite it a bit to always have a single allocation for devm node:

static void meson_pwm_s4_put_clk(void *data)
{
	struct meson_pwm *meson = data;
	int i;

	for (i = 0; i < MESON_NUM_PWMS; i++)
		clk_put(meson->channels[i].clk);
}

static int meson_pwm_init_channels_s4(struct pwm_chip *chip)
{
	struct device *dev = pwmchip_parent(chip);
	struct device_node *np = dev->of_node;
	struct meson_pwm *meson = to_meson_pwm(chip);
	int i, ret;

	ret = devm_add_action(dev, meson_pwm_s4_put_clk, meson);
	if (ret)
		return ret;

	for (i = 0; i < MESON_NUM_PWMS; i++) {
		meson->channels[i].clk = of_clk_get(np, i);
		if (IS_ERR(meson->channels[i].clk)) {
			ret = PTR_ERR(meson->channels[i].clk);
			dev_err_probe(dev, ret, "Failed to get clk\n");
			return ret;
		}
	}

	return 0;
}


-- 
Best regards
George