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Message-ID: <0086CD40-F161-4B33-8D76-8DCA20E7DB07@aosc.io>
Date:   Thu, 03 Oct 2019 21:04:03 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org,
        Maxime Ripard <mripard@...nel.org>,
        Jagan Teki <jagan@...rulasolutions.com>
CC:     devicetree@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>, Daniel Vetter <daniel@...ll.ch>,
        michael@...rulasolutions.com
Subject: Re: [PATCH v11 4/7] dt-bindings: sun6i-dsi: Add VCC-DSI supply property



于 2019年10月3日 GMT+08:00 下午7:47:33, Maxime Ripard <mripard@...nel.org> 写到:
>On Thu, Oct 03, 2019 at 12:15:24PM +0530, Jagan Teki wrote:
>> Allwinner MIPI DSI controllers are supplied with SoC DSI
>> power rails via VCC-DSI pin.
>>
>> Some board still work without supplying this but give more
>> faith on datasheet and hardware schematics and document this
>> supply property in required property list.
>>
>> Reviewed-by: Rob Herring <robh@...nel.org>
>> Tested-by: Merlijn Wajer <merlijn@...zup.org>
>> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
>> ---
>>  .../bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml         | 3
>+++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git
>a/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
>b/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
>> index 47950fced28d..9d4c25b104f6 100644
>> ---
>a/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
>> +++
>b/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
>> @@ -36,6 +36,9 @@ properties:
>>    resets:
>>      maxItems: 1
>>
>> +  vcc-dsi-supply:
>> +    description: VCC-DSI power supply of the DSI encoder
>> +
>
>The driver treats it as mandatory, so I've added it to the binding, as
>suggested by the commit log.

No. The regulator_get function will return dummy regulator, rather than
fail, if the regulator is not specified.

>
>Maxime

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