linux-kernel - Re: [PATCH] pwm: atmel: Remove platform_device

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Message-ID: <20190918144058.GN21254@piout.net>
Date:   Wed, 18 Sep 2019 16:40:58 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Kamel Bouhara <kamel.bouhara@...tlin.com>
Cc:     Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org,
        Gregory Clement <gregory.clement@...tlin.com>
Subject: Re: [PATCH] pwm: atmel: Remove platform_device_id and use only dt
 bindings

Hi,

On 18/09/2019 16:05:34+0200, Kamel Bouhara wrote:
> Since commit 26202873bb51 ("avr32: remove support for AVR32
> architecture") there is no more user of platform_device_id and we
> should only use dt bindings
> 
> Signed-off-by: Kamel Bouhara <kamel.bouhara@...tlin.com>
> ---
>  drivers/pwm/Kconfig     |  2 +-
>  drivers/pwm/pwm-atmel.c | 29 +++--------------------------
>  2 files changed, 4 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index a7e57516959e..b51fb1a33aa2 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -44,7 +44,7 @@ config PWM_AB8500
>  
>  config PWM_ATMEL
>  	tristate "Atmel PWM support"
> -	depends on ARCH_AT91
> +	depends on ARCH_AT91 && OF
>  	help
>  	  Generic PWM framework driver for Atmel SoC.
>  
> diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
> index e5e1eaf372fa..a3d93d634462 100644
> --- a/drivers/pwm/pwm-atmel.c
> +++ b/drivers/pwm/pwm-atmel.c
> @@ -318,19 +318,6 @@ static const struct atmel_pwm_data mchp_sam9x60_pwm_data = {
>  	},
>  };
>  
> -static const struct platform_device_id atmel_pwm_devtypes[] = {
> -	{
> -		.name = "at91sam9rl-pwm",
> -		.driver_data = (kernel_ulong_t)&atmel_sam9rl_pwm_data,
> -	}, {
> -		.name = "sama5d3-pwm",
> -		.driver_data = (kernel_ulong_t)&atmel_sama5_pwm_data,
> -	}, {
> -		/* sentinel */
> -	},
> -};
> -MODULE_DEVICE_TABLE(platform, atmel_pwm_devtypes);
> -
>  static const struct of_device_id atmel_pwm_dt_ids[] = {
>  	{
>  		.compatible = "atmel,at91sam9rl-pwm",
> @@ -353,14 +340,7 @@ MODULE_DEVICE_TABLE(of, atmel_pwm_dt_ids);
>  static inline const struct atmel_pwm_data *
>  atmel_pwm_get_driver_data(struct platform_device *pdev)
>  {
> -	const struct platform_device_id *id;
> -
> -	if (pdev->dev.of_node)
> -		return of_device_get_match_data(&pdev->dev);
> -
> -	id = platform_get_device_id(pdev);
> -
> -	return (struct atmel_pwm_data *)id->driver_data;
> +	return of_device_get_match_data(&pdev->dev);

The whole function is gone so you could simply call
of_device_get_match_data from atmel_pwm_probe.

>  }
>  
>  static int atmel_pwm_probe(struct platform_device *pdev)
> @@ -396,10 +376,8 @@ static int atmel_pwm_probe(struct platform_device *pdev)
>  	atmel_pwm->chip.dev = &pdev->dev;
>  	atmel_pwm->chip.ops = &atmel_pwm_ops;
>  
> -	if (pdev->dev.of_node) {
> -		atmel_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
> -		atmel_pwm->chip.of_pwm_n_cells = 3;
> -	}
> +	atmel_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
> +	atmel_pwm->chip.of_pwm_n_cells = 3;
>  
>  	atmel_pwm->chip.base = -1;
>  	atmel_pwm->chip.npwm = 4;
> @@ -437,7 +415,6 @@ static struct platform_driver atmel_pwm_driver = {
>  		.name = "atmel-pwm",
>  		.of_match_table = of_match_ptr(atmel_pwm_dt_ids),
>  	},
> -	.id_table = atmel_pwm_devtypes,
>  	.probe = atmel_pwm_probe,
>  	.remove = atmel_pwm_remove,
>  };
> -- 
> 2.23.0
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com