linux-kernel - Re: [PATCH V2] dt-bindings: bridge: samsung-dsim: Make some flags optional

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Message-ID: <CAMty3ZB=XfMr7k31yHzZ+YHFxT0ifCbmR4+s5yw+YgTSJE0Jxg@mail.gmail.com>
Date:   Sun, 28 May 2023 19:04:01 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Adam Ford <aford173@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, aford@...conembedded.com,
        Conor Dooley <conor.dooley@...rochip.com>,
        Inki Dae <inki.dae@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] dt-bindings: bridge: samsung-dsim: Make some flags optional

On Sun, May 28, 2023 at 6:57 PM Adam Ford <aford173@...il.com> wrote:
>
> In the event a device is connected to the samsung-dsim
> controller that doesn't support the burst-clock, the
> driver is able to get the requested pixel clock from the
> attached device or bridge.  In these instances, the
> samsung,burst-clock-frequency isn't needed, so remove
> it from the required list.
>
> The pll-clock frequency can be set by the device tree entry
> for samsung,pll-clock-frequency, but in some cases, the
> pll-clock may have the same clock rate as sclk_mipi clock.
> If they are equal, this flag is not needed since the driver
> will use the sclk_mipi rate as a fallback.
>
> Signed-off-by: Adam Ford <aford173@...il.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
> V2:  Split from driver series.  Re-word updates for burst
> and pll-clock frequency.
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml b/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml
> index 9f61ebdfefa8..06b6c44d4641 100644
> --- a/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/samsung,mipi-dsim.yaml
> @@ -70,7 +70,9 @@ properties:
>    samsung,burst-clock-frequency:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      description:
> -      DSIM high speed burst mode frequency.
> +      DSIM high speed burst mode frequency.  If absent,
> +      the pixel clock from the attached device or bridge
> +      will be used instead.
>
>    samsung,esc-clock-frequency:
>      $ref: /schemas/types.yaml#/definitions/uint32
> @@ -80,7 +82,8 @@ properties:
>    samsung,pll-clock-frequency:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      description:
> -      DSIM oscillator clock frequency.
> +      DSIM oscillator clock frequency. If absent, the clock frequency
> +      of sclk_mipi will be used instead.

Maybe this explicit comment won't require as it is not listed in "required"

Reviewed-by: Jagan Teki <jagan@...rulasolutions.com>