linux-kernel - Re: [PATCH v3 0/2] DSS: Add support for DisplayPort

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Date:   Fri, 15 Apr 2022 12:51:12 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Rahul T R <r-ravikumar@...com>, <nm@...com>
CC:     <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski@...onical.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <tomi.valkeinen@...asonboard.com>,
        <laurent.pinchart@...asonboard.com>, <kishon@...com>
Subject: Re: [PATCH v3 0/2] DSS: Add support for DisplayPort



On 06/04/22 10:28 pm, Rahul T R wrote:
> The following series of patches enables DisplayPort on
> j721e-evm
> 
> Tomi Valkeinen (2):
>   arm64: dts: ti: k3-j721e-main: add DP & DP PHY
>   arm64: dts: ti: k3-j721e-common-proc-board: add DP to j7 evm
> 
> v2:
>    - use phandle with a parameter to refer clocks insted of
>      sub nodes in serdes_wiz node
>    - move phy link node to board DTS file
> 
> v3:
>    - Fix the regulator node name as per the DT spec
>    - Use Macro for GPIO type
> 
> boot logs:
>    https://gist.githubusercontent.com/ravi-rahul/1bdbc3f77ab381e486c8394650c2e85d/raw/f04584c30181821c4ee83aee7781a9ba143cd3f3/j7_DP_upstream.log
> 
> kernel patch verify report:
>    https://gist.githubusercontent.com/ravi-rahul/a982fef3fae03ec0dbdd5cb475a4cb25/raw/c8230370746e9878daf9527c3aa9d82eed7aa33c/report-kernel-patch-verify.txt

Hmm, With dtbs_check I see (on v5.18-rc1 tag)

+/workdir/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dtb: dp-bridge@...0000: ports: 'port@0' is a required property
+/workdir/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dtb: dp-bridge@...0000: ports: 'port@4' is a required property
+/workdir/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dtb: dp-bridge@...0000: 'phys' is a required property
+/workdir/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dtb: dp-bridge@...0000: 'phy-names' is a required property

This goes away with 2/2 although adds:
+<stdout>: Warning (graph_child_address): /bus@...000/dss@...0000/ports: graph node has single child node 'port@0', #address-cells/#size-cells are not necessary


Do we need to have empty ports node in j721e-main.dtsi for dp-bridge?   And something similar wrt phys as well?

Regards
Vignesh

> 
>  .../dts/ti/k3-j721e-common-proc-board.dts     | 78 ++++++++++++++++++-
>  arch/arm64/boot/dts/ti/k3-j721e-main.dtsi     | 65 ++++++++++++++++
>  2 files changed, 139 insertions(+), 4 deletions(-)
>