linux-kernel - Re: [DMARC error][DKIM error] [PATCH v6 1/2] pwm: meson: Add support for Amlogic S4 PWM

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Message-ID: <81bf75e9-6aac-4c18-aac7-3cb127d9a7b8@salutedevices.com>
Date: Thu, 30 May 2024 15:33:23 +0300
From: George Stark <gnstark@...utedevices.com>
To: <kelvin.zhang@...ogic.com>
CC: Kevin Hilman <khilman@...libre.com>, Rob Herring <robh@...nel.org>, Jerome
 Brunet <jbrunet@...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>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, Junyi Zhao <junyi.zhao@...ogic.com>, Martin
 Blumenstingl <martin.blumenstingl@...glemail.com>, "kernel@...utedevices.com"
	<kernel@...utedevices.com>
Subject: Re: [DMARC error][DKIM error] [PATCH v6 1/2] pwm: meson: Add support
 for Amlogic S4 PWM

Hello Kelvin, Junyi

On 5/29/24 13:00, 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 | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 49 insertions(+)
> 
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index b2f97dfb01bb..a513ebbb5666 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -460,6 +460,47 @@ 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 meson_pwm *meson = (struct meson_pwm *)data;
There's no need for type-casting. Here is maintainers' request for a 
similar case:
https://lore.kernel.org/lkml/CAHp75VeNijg6sXyW_frwD4siJ-LWBLBfVCmMDug8jYAVVg9Bmw@mail.gmail.com/

> +	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);
> +	struct meson_pwm_channel *channel;
> +	int i, ret;
> +
> +	for (i = 0; i < MESON_NUM_PWMS; i++) {
> +		channel = &meson->channels[i];
> +		channel->clk = of_clk_get(np, i);
> +		if (IS_ERR(channel->clk)) {
> +			ret = PTR_ERR(channel->clk);
> +			dev_err_probe(dev, ret, "Failed to get clk\n");
> +			goto err;
> +		}
> +	}
> +	ret = devm_add_action_or_reset(dev, meson_pwm_s4_put_clk, meson);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +
> +err:
> +	while (--i >= 0) {
> +		channel = &meson->channels[i];
> +		clk_put(channel->clk);
> +	}
Just as in meson_pwm_s4_put_clk() you can write it shorter:
	while (--i >= 0)
		clk_put(meson->channels[i].clk);

> +
> +	return ret;
> +}
> +
>   static const struct meson_pwm_data pwm_meson8b_data = {
>   	.parent_names = { "xtal", NULL, "fclk_div4", "fclk_div3" },
>   	.channels_init = meson_pwm_init_channels_meson8b_legacy,
> @@ -498,6 +539,10 @@ static const struct meson_pwm_data pwm_meson8_v2_data = {
>   	.channels_init = meson_pwm_init_channels_meson8b_v2,
>   };
>   
> +static const struct meson_pwm_data pwm_s4_data = {
> +	.channels_init = meson_pwm_init_channels_s4,
> +};
> +
>   static const struct of_device_id meson_pwm_matches[] = {
>   	{
>   		.compatible = "amlogic,meson8-pwm-v2",
> @@ -536,6 +581,10 @@ static const struct of_device_id meson_pwm_matches[] = {
>   		.compatible = "amlogic,meson-g12a-ao-pwm-cd",
>   		.data = &pwm_g12a_ao_cd_data
>   	},
> +	{
> +		.compatible = "amlogic,meson-s4-pwm",
> +		.data = &pwm_s4_data
> +	},
>   	{},
>   };
>   MODULE_DEVICE_TABLE(of, meson_pwm_matches);
> 

-- 
Best regards
George