linux-kernel - Re: [PATCH 3/5] arm64: dts: imx8mp-msc-sm2s-ep1: Add HDMI connector

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Message-ID: <48e42fa7-f36e-4d38-b60b-51c9a6748de6@kontron.de>
Date: Mon, 21 Oct 2024 09:15:38 +0200
From: Frieder Schrempf <frieder.schrempf@...tron.de>
To: Marek Vasut <marex@...x.de>, Liu Ying <victor.liu@....com>,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
 festevam@...il.com, andrzej.hajda@...el.com, neil.armstrong@...aro.org,
 rfoss@...nel.org, Laurent.pinchart@...asonboard.com, jonas@...boo.se,
 jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
 stefan@...er.ch, dmitry.baryshkov@...aro.org
Subject: Re: [PATCH 3/5] arm64: dts: imx8mp-msc-sm2s-ep1: Add HDMI connector

On 18.10.24 11:35 AM, Marek Vasut wrote:
> On 10/18/24 11:00 AM, Liu Ying wrote:
>> On 10/18/2024, Marek Vasut wrote:
>>> On 10/18/24 8:48 AM, Liu Ying wrote:
>>>> Add a HDMI connector to connect with i.MX8MP HDMI TX output.
>>>> This is a preparation for making the i.MX8MP LCDIF driver use
>>>> drm_bridge_connector which requires the DRM_BRIDGE_ATTACH_NO_CONNECTOR
>>>> flag.  With that flag, the DW HDMI bridge core driver would
>>>> try to attach the next bridge which is the HDMI connector.
>>>>
>>>> Signed-off-by: Liu Ying <victor.liu@....com>
>>>> ---
>>>>    .../dts/freescale/imx8mp-msc-sm2s-ep1.dts     | 19 ++++++++++++++
>>>> +++++
>>>>    1 file changed, 19 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-msc-sm2s-ep1.dts
>>>> b/arch/arm64/boot/dts/freescale/imx8mp-msc-sm2s-ep1.dts
>>>> index 83194ea7cb81..b776646a258a 100644
>>>> --- a/arch/arm64/boot/dts/freescale/imx8mp-msc-sm2s-ep1.dts
>>>> +++ b/arch/arm64/boot/dts/freescale/imx8mp-msc-sm2s-ep1.dts
>>>> @@ -15,6 +15,17 @@ / {
>>>>                 "avnet,sm2s-imx8mp-14N0600E", "avnet,sm2s-imx8mp",
>>>>                 "fsl,imx8mp";
>>>>    +    hdmi-connector {
>>>> +        compatible = "hdmi-connector";
>>>> +        type = "a";
>>> Shouldn't this also have a 'label' property ?
>>
>> 'label' property is not required by hdmi-connector.yaml and there
>> are in-tree hdmi-connector nodes that haven't got it.
>> I tried to find schematics for the board online, but failed.
>> I don't have the board to see the label printed in silk layer, either.
>>
>> If anyone can provide a valid label name, I may add it.
> For the Kontron board, Frieder might be able to look it up for you ?

The Kontron PCB doesn't have a silkscreen label for the connector. The
schematic has the label "X801" for the part and the signals on the
connector are prefixed with "HDMI_CON".