linux-kernel - Re: [PATCH v2] leds: pwm: add support for default-state device property

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Date:   Wed, 11 Mar 2020 22:33:09 +0100
From:   Pavel Machek <pavel@....cz>
To:     "20200309082218.13263-1-Denis.Osterland@...hl.com" 
        <20200309082218.13263-1-Denis.Osterland@...hl.com>
Cc:     "dmurphy@...com" <dmurphy@...com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "jacek.anaszewski@...il.com" <jacek.anaszewski@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Denis Osterland-Heim <denis.osterland@...hl.com>,
        "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2] leds: pwm: add support for default-state device
 property

Hi!

> This patch adds support for "default-state" devicetree property, which
> allows to defer pwm init to first use of led.
> 
> This allows to configure the PWM early in bootloader to let the LED
> blink until an application in Linux userspace set something different.

"sets".

> Signed-off-by: Denis Osterland-Heim <Denis.Osterland@...hl.com>

Looks good, I'll probably just apply it.

> index 6c6583c35f2f..d0f489680594 100644
> --- a/Documentation/devicetree/bindings/leds/leds-pwm.txt
> +++ b/Documentation/devicetree/bindings/leds/leds-pwm.txt
> @@ -19,6 +19,8 @@ LED sub-node properties:
>    see Documentation/devicetree/bindings/leds/common.txt
>  - linux,default-trigger :  (optional)
>    see Documentation/devicetree/bindings/leds/common.txt
> +- default-state : (optional)
> +  see Documentation/devicetree/bindings/leds/common.yaml
>  

Should other references be updated to common.yaml (as a separate patch)?

> diff --git a/include/linux/leds_pwm.h b/include/linux/leds_pwm.h
> index 93d101d28943..c9ef9012913d 100644
> --- a/include/linux/leds_pwm.h
> +++ b/include/linux/leds_pwm.h
> @@ -10,6 +10,7 @@ struct led_pwm {
>  	const char	*default_trigger;
>  	unsigned	pwm_id __deprecated;
>  	u8 		active_low;
> +	u8		default_state;
>  	unsigned 	max_brightness;
>  	unsigned	pwm_period_ns;
>  };

leds-pwm.c but leds_pwm.h. Hmm. This really should be leds-pwm.h.

Actually, leds-pwm.c is only user of leds_pwm.h, so that one should
just disappear...

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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