linux-kernel - Re: [PATCH v2 2/2] ARM: tegra: transformers: add connector node

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Date:   Tue, 1 Aug 2023 23:29:21 +0200
From:   Maxim Schwalm <maxim.schwalm@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Svyatoslav Ryhel <clamor95@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Osipenko <digetx@...il.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 2/2] ARM: tegra: transformers: add connector node

Hi,

On 27.07.23 18:50, Thierry Reding wrote:
> On Thu, Jul 27, 2023 at 07:26:28PM +0300, Svyatoslav Ryhel wrote:
>>
>>
>> 27 липня 2023 р. 18:11:15 GMT+03:00, Thierry Reding <thierry.reding@...il.com> написав(-ла):
>>> On Sun, Jun 18, 2023 at 11:50:46AM +0300, Svyatoslav Ryhel wrote:
>>>> All ASUS Transformers have micro-HDMI connector directly available.
>>>> After Tegra HDMI got bridge/connector support, we should use connector
>>>> framework for proper HW description.
>>>>
>>>> Tested-by: Andreas Westman Dorcsak <hedmoo@...oo.com> # ASUS TF T30
>>>> Tested-by: Robert Eckelmann <longnoserob@...il.com> # ASUS TF101 T20
>>>> Tested-by: Svyatoslav Ryhel <clamor95@...il.com> # ASUS TF201 T30
>>>> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
>>>> ---
>>>>  arch/arm/boot/dts/tegra20-asus-tf101.dts      | 22 ++++++++++++++++---
>>>>  .../dts/tegra30-asus-transformer-common.dtsi  | 21 ++++++++++++++++--
>>>>  2 files changed, 38 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/arch/arm/boot/dts/tegra20-asus-tf101.dts b/arch/arm/boot/dts/tegra20-asus-tf101.dts
>>>> index c2a9c3fb5b33..97350f566539 100644
>>>> --- a/arch/arm/boot/dts/tegra20-asus-tf101.dts
>>>> +++ b/arch/arm/boot/dts/tegra20-asus-tf101.dts
>>>> @@ -82,9 +82,11 @@ hdmi@...80000 {
>>>>  			pll-supply = <&hdmi_pll_reg>;
>>>>  			hdmi-supply = <&vdd_hdmi_en>;
>>>>  
>>>> -			nvidia,ddc-i2c-bus = <&hdmi_ddc>;
>>>> -			nvidia,hpd-gpio = <&gpio TEGRA_GPIO(N, 7)
>>>> -				GPIO_ACTIVE_HIGH>;
>>>> +			port@0 {
>>>> +				hdmi_out: endpoint {
>>>> +					remote-endpoint = <&connector_in>;
>>>> +				};
>>>> +			};
>>>
>>> Does this need a bindings change? nvidia,tegra20-hdmi currently doesn't
>>> support OF graphs, so this would probably fail to validate if we merge
>>> it without a corresponding DT bindings update.
>>
>> drm/tegra patch is backwards compatible and connector node is optional.
> 
> We still need to document the connector node, otherwise the DT
> validation will complain about port@0 being used here, won't it?

this change indeed causes several new warnings:

    /mnt/linux/.output/arch/arm/boot/dts/tegra20-asus-tf101.dtb: hdmi@...80000: 'port@0' does not match any of the regexes: 'pinctrl-[0-9]+'
            From schema: /mnt/linux/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-hdmi.yaml
    /mnt/linux/.output/arch/arm/boot/dts/tegra20-asus-tf101.dtb: hdmi@...80000: 'nvidia,ddc-i2c-bus' is a required property
            From schema: /mnt/linux/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-hdmi.yaml
    /mnt/linux/.output/arch/arm/boot/dts/tegra20-asus-tf101.dtb: hdmi@...80000: 'nvidia,hpd-gpio' is a required property
            From schema: /mnt/linux/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-hdmi.yaml

BTW, the parallel RGB port isn't properly documented in nvidia,tegra20-dc either.

Best regards,
Maxim