linux-kernel - Re: [PATCH 1/2] dt-bindings: drm/bridge: ti-sn65dsi86: Replace #pwm-cells

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Message-ID: <7ff13ed2-5fe4-01b5-d1d7-0916f0630196@kali.org>
Date:   Wed, 30 Sep 2020 18:06:55 -0500
From:   Steev Klimaszewski <steev@...i.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Douglas Anderson <dianders@...omium.org>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: drm/bridge: ti-sn65dsi86: Replace
 #pwm-cells


On 9/30/20 5:35 PM, Bjorn Andersson wrote:
> While the signal on GPIO4 to drive the backlight controller indeed is
> pulse width modulated its purpose is specifically to control the
> brightness of a backlight.
>
> Drop the #pwm-cells and instead expose a new property to configure the
> granularity of the backlight PWM signal.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  .../devicetree/bindings/display/bridge/ti,sn65dsi86.yaml | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> index f8622bd0f61e..e380218b4646 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.yaml
> @@ -66,9 +66,12 @@ properties:
>        1-based to match the datasheet.  See ../../gpio/gpio.txt for more
>        information.
>  
> -  '#pwm-cells':
> -    const: 1
> -    description: See ../../pwm/pwm.yaml for description of the cell formats.
> +  ti,backlight-scale:
> +    description:
> +      The granularity of brightness for the PWM signal provided on GPIO4, if
> +      this property is specified.
> +    minimum: 0
> +    maximum: 65535
>  
>    ports:
>      type: object


Tested-By: Steev Klimaszewski <steev@...i.org>