linux-kernel - Re: [PATCH v2 03/16] pwm: cros-ec: update documentation regarding pwm-cells

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Date:   Fri, 12 Jan 2018 10:31:23 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     thierry.reding@...il.com, robh+dt@...nel.org, mark.rutland@....com,
        linux@...linux.org.uk, daniel@...que.org, haojian.zhuang@...il.com,
        robert.jarzmik@...e.fr, corbet@....net,
        nicolas.ferre@...rochip.com, alexandre.belloni@...e-electrons.com,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 03/16] pwm: cros-ec: update documentation regarding
 pwm-cells

On Fri, Jan 12, 2018 at 04:22:50PM +0200, Claudiu Beznea wrote:
> pwm-cells should be at least 2 to provide channel number and period value.

Nacked-by: Brian Norris <briannorris@...omium.org>

We don't control the period from the kernel; only the duty cycle. (Now,
that's perhaps not a wise firmware interface, and we may fix that
someday, but you can't just declare a breaking change to a documented,
reviewed binding.)

> Cc: Brian Norris <briannorris@...omium.org>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
>  Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt
> index 472bd46ab5a4..03347fd302b5 100644
> --- a/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt
> +++ b/Documentation/devicetree/bindings/pwm/google,cros-ec-pwm.txt
> @@ -8,7 +8,7 @@ Documentation/devicetree/bindings/mfd/cros-ec.txt).
>  
>  Required properties:
>  - compatible: Must contain "google,cros-ec-pwm"
> -- #pwm-cells: Should be 1. The cell specifies the PWM index.
> +- #pwm-cells: Should be 2. The cell specifies the PWM index.

Umm, "2 cells", but you use the singular "cell", and don't document what
the second one is? That's nonsense.

Brian

>  
>  Example:
>  	cros-ec@0 {
> @@ -18,6 +18,6 @@ Example:
>  
>  		cros_ec_pwm: ec-pwm {
>  			compatible = "google,cros-ec-pwm";
> -			#pwm-cells = <1>;
> +			#pwm-cells = <2>;
>  		};
>  	};
> -- 
> 2.7.4
>