linux-kernel - Re: [PATCH] pwm: axi-pwmgen: Create a dedicated function for getting driver data from a chip

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Message-ID: <95e372fc-5656-4c11-9e84-0df624fca0ad@baylibre.com>
Date: Mon, 23 Sep 2024 08:56:09 -0400
From: Trevor Gamblin <tgamblin@...libre.com>
To: Uwe Kleine-König <u.kleine-koenig@...libre.com>,
 Michael Hennerich <michael.hennerich@...log.com>,
 Nuno Sá <nuno.sa@...log.com>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pwm: axi-pwmgen: Create a dedicated function for getting
 driver data from a chip


On 2024-09-23 08:54, Uwe Kleine-König wrote:
> Compared to direct calls to pwmchip_get_drvdata() a dedicated function
> has two upsides: A better name and the right type. So the code becomes
> easier to read and the new function is harder to use wrongly.
>
> Another side effect (which is the secret motivation for this patch, but
> shhh) is that the driver becomes a bit easier to backport to kernel
> versions that don't have devm_pwmchip_alloc() yet.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...libre.com>
Reviewed-by: Trevor Gamblin <tgamblin@...libre.com>
> ---
>   drivers/pwm/pwm-axi-pwmgen.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pwm/pwm-axi-pwmgen.c b/drivers/pwm/pwm-axi-pwmgen.c
> index b5477659ba18..e5162f3e511e 100644
> --- a/drivers/pwm/pwm-axi-pwmgen.c
> +++ b/drivers/pwm/pwm-axi-pwmgen.c
> @@ -53,10 +53,15 @@ static const struct regmap_config axi_pwmgen_regmap_config = {
>   	.max_register = 0xFC,
>   };
>   
> +static struct axi_pwmgen_ddata axi_pwmgen_ddata_from_chip(struct pwm_chip *chip)
> +{
> +	return pwmchip_get_drvdata(chip);
> +}
> +
>   static int axi_pwmgen_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>   			    const struct pwm_state *state)
>   {
> -	struct axi_pwmgen_ddata *ddata = pwmchip_get_drvdata(chip);
> +	struct axi_pwmgen_ddata *ddata = axi_pwmgen_ddata_from_chip(chip);
>   	unsigned int ch = pwm->hwpwm;
>   	struct regmap *regmap = ddata->regmap;
>   	u64 period_cnt, duty_cnt;
> @@ -100,7 +105,7 @@ static int axi_pwmgen_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>   static int axi_pwmgen_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
>   				struct pwm_state *state)
>   {
> -	struct axi_pwmgen_ddata *ddata = pwmchip_get_drvdata(chip);
> +	struct axi_pwmgen_ddata *ddata = axi_pwmgen_ddata_from_chip(chip);
>   	struct regmap *regmap = ddata->regmap;
>   	unsigned int ch = pwm->hwpwm;
>   	u32 cnt;
>
> base-commit: 62f92d634458a1e308bb699986b9147a6d670457