linux-kernel - Re: [PATCH 2/2] pwm: use PWM_LOOKUP to set the period and polarity

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Message-ID: <20140409231549.GD2187@verge.net.au>
Date:	Thu, 10 Apr 2014 08:15:49 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Philipp Zabel <philipp.zabel@...il.com>,
	Paul Parsons <lost.distance@...oo.com>,
	Magnus Damm <magnus.damm@...il.com>, linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH 2/2] pwm: use PWM_LOOKUP to set the period and polarity

On Wed, Apr 09, 2014 at 08:04:09PM +0200, Alexandre Belloni wrote:
> Now that the PWM core is able to set the period and polarity based on
> the lookup table, add those to PWM_LOOKUP to ease their usage.

I would prefer if this change was made in a non-atomic manner.

1. Add new infrastructure
2. Update users individually
3. Remove old infrastructure

> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---
>  Documentation/pwm.txt                          | 3 ++-
>  arch/arm/mach-omap2/board-omap3beagle.c        | 3 ++-
>  arch/arm/mach-pxa/hx4700.c                     | 3 ++-
>  arch/arm/mach-shmobile/board-armadillo800eva.c | 3 ++-
>  include/linux/pwm.h                            | 4 +++-
>  5 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt
> index 93cb97974986..f38f99cda64f 100644
> --- a/Documentation/pwm.txt
> +++ b/Documentation/pwm.txt
> @@ -19,7 +19,8 @@ should instead register a static mapping that can be used to match PWM
>  consumers to providers, as given in the following example:
>  
>  	static struct pwm_lookup board_pwm_lookup[] = {
> -		PWM_LOOKUP("tegra-pwm", 0, "pwm-backlight", NULL),
> +		PWM_LOOKUP("tegra-pwm", 0, "pwm-backlight", NULL,
> +			   50000, PWM_POLARITY_NORMAL),
>  	};
>  
>  	static void __init board_init(void)
> diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
> index d6ed819ff15c..54c135a5b4f7 100644
> --- a/arch/arm/mach-omap2/board-omap3beagle.c
> +++ b/arch/arm/mach-omap2/board-omap3beagle.c
> @@ -61,7 +61,8 @@
>  
>  static struct pwm_lookup pwm_lookup[] = {
>  	/* LEDB -> PMU_STAT */
> -	PWM_LOOKUP("twl-pwmled", 1, "leds_pwm", "beagleboard::pmu_stat"),
> +	PWM_LOOKUP("twl-pwmled", 1, "leds_pwm", "beagleboard::pmu_stat",
> +		   7812500, PWM_POLARITY_NORMAL),
>  };
>  
>  static struct led_pwm pwm_leds[] = {
> diff --git a/arch/arm/mach-pxa/hx4700.c b/arch/arm/mach-pxa/hx4700.c
> index a7c30eb0c8db..c66ad4edc5e3 100644
> --- a/arch/arm/mach-pxa/hx4700.c
> +++ b/arch/arm/mach-pxa/hx4700.c
> @@ -574,7 +574,8 @@ static struct platform_device backlight = {
>  };
>  
>  static struct pwm_lookup hx4700_pwm_lookup[] = {
> -	PWM_LOOKUP("pxa27x-pwm.1", 0, "pwm-backlight", NULL),
> +	PWM_LOOKUP("pxa27x-pwm.1", 0, "pwm-backlight", NULL,
> +		   30923, PWM_POLARITY_NORMAL),
>  };
>  
>  /*
> diff --git a/arch/arm/mach-shmobile/board-armadillo800eva.c b/arch/arm/mach-shmobile/board-armadillo800eva.c
> index 2858f380beae..e2c4c5010f19 100644
> --- a/arch/arm/mach-shmobile/board-armadillo800eva.c
> +++ b/arch/arm/mach-shmobile/board-armadillo800eva.c
> @@ -416,7 +416,8 @@ static struct platform_device pwm_device = {
>  };
>  
>  static struct pwm_lookup pwm_lookup[] = {
> -	PWM_LOOKUP("renesas-tpu-pwm", 2, "pwm-backlight.0", NULL),
> +	PWM_LOOKUP("renesas-tpu-pwm", 2, "pwm-backlight.0", NULL,
> +		   33333, PWM_POLARITY_NORMAL),
>  };
>  
>  /* LCDC and backlight */
> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
> index 2f45e2fe5b93..e90628cac8fa 100644
> --- a/include/linux/pwm.h
> +++ b/include/linux/pwm.h
> @@ -278,12 +278,14 @@ struct pwm_lookup {
>  	enum pwm_polarity polarity;
>  };
>  
> -#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id)	\
> +#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id, _period, _polarity) \
>  	{						\
>  		.provider = _provider,			\
>  		.index = _index,			\
>  		.dev_id = _dev_id,			\
>  		.con_id = _con_id,			\
> +		.period = _period,			\
> +		.polarity = _polarity			\
>  	}
>  
>  #if IS_ENABLED(CONFIG_PWM)
> -- 
> 1.8.3.2
> 
> --
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