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Message-ID: <66729683-32ad-4000-b9be-001cd5631b97@collabora.com>
Date: Fri, 19 Apr 2024 09:44:53 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Rob Herring <robh@...nel.org>
Cc: chunkuang.hu@...nel.org, krzysztof.kozlowski+dt@...aro.org,
conor+dt@...nel.org, p.zabel@...gutronix.de, airlied@...il.com,
daniel@...ll.ch, maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, matthias.bgg@...il.com, shawn.sung@...iatek.com,
yu-chang.lee@...iatek.com, ck.hu@...iatek.com, jitao.shi@...iatek.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, wenst@...omium.org,
kernel@...labora.com
Subject: Re: [PATCH v2 1/3] dt-bindings: display: mediatek: Add OF graph
support for board path
Il 10/04/24 21:03, Rob Herring ha scritto:
> On Tue, Apr 09, 2024 at 02:02:09PM +0200, AngeloGioacchino Del Regno wrote:
>> The display IPs in MediaTek SoCs support being interconnected with
>> different instances of DDP IPs (for example, merge0 or merge1) and/or
>> with different DDP IPs (for example, rdma can be connected with either
>> color, dpi, dsi, merge, etc), forming a full Display Data Path that
>> ends with an actual display.
>>
>> The final display pipeline is effectively board specific, as it does
>> depend on the display that is attached to it, and eventually on the
>> sensors supported by the board (for example, Adaptive Ambient Light
>> would need an Ambient Light Sensor, otherwise it's pointless!), other
>> than the output type.
>>
>> Add support for OF graphs to most of the MediaTek DDP (display) bindings
>> to add flexibility to build custom hardware paths, hence enabling board
>> specific configuration of the display pipeline and allowing to finally
>> migrate away from using hardcoded paths.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>> .../display/mediatek/mediatek,aal.yaml | 40 +++++++++++++++++++
>> .../display/mediatek/mediatek,ccorr.yaml | 21 ++++++++++
>> .../display/mediatek/mediatek,color.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,dither.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,dpi.yaml | 25 +++++++++++-
>> .../display/mediatek/mediatek,dsc.yaml | 24 +++++++++++
>> .../display/mediatek/mediatek,dsi.yaml | 27 ++++++++++++-
>> .../display/mediatek/mediatek,ethdr.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,gamma.yaml | 19 +++++++++
>> .../display/mediatek/mediatek,merge.yaml | 23 +++++++++++
>> .../display/mediatek/mediatek,od.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,ovl-2l.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,ovl.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,postmask.yaml | 21 ++++++++++
>> .../display/mediatek/mediatek,rdma.yaml | 22 ++++++++++
>> .../display/mediatek/mediatek,ufoe.yaml | 21 ++++++++++
>> 16 files changed, 372 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,aal.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,aal.yaml
>> index b4c28e96dd55..623cf7e37fe3 100644
>> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,aal.yaml
>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,aal.yaml
>> @@ -61,6 +61,27 @@ properties:
>> $ref: /schemas/types.yaml#/definitions/phandle-array
>> maxItems: 1
>>
>> + ports:
>> + $ref: /schemas/graph.yaml#/properties/ports
>> + description:
>> + Input and output ports can have multiple endpoints, each of those
>> + connects to either the primary, secondary, etc, display pipeline.
>> +
>> + properties:
>> + port@0:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description: AAL input port
>> +
>> + port@1:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description:
>> + AAL output to the next component's input, for example could be one
>> + of many gamma, overdrive or other blocks.
>> +
>> + required:
>> + - port@0
>> + - port@1
>> +
>> required:
>> - compatible
>> - reg
>> @@ -88,5 +109,24 @@ examples:
>> power-domains = <&scpsys MT8173_POWER_DOMAIN_MM>;
>> clocks = <&mmsys CLK_MM_DISP_AAL>;
>> mediatek,gce-client-reg = <&gce SUBSYS_1401XXXX 0x5000 0x1000>;
>> +
>> + ports {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + port@0 {
>> + reg = <0>;
>> + aal0_in: endpoint {
>> + remote-endpoint = <&ccorr0_out>;
>> + };
>> + };
>> +
>> + port@1 {
>> + reg = <1>;
>> + aal0_out: endpoint {
>> + remote-endpoint = <&gamma0_in>;
>> + };
>> + };
>> + };
>> };
>> };
>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,ccorr.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,ccorr.yaml
>> index 8c2a737237f2..71ea277a5d8e 100644
>> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,ccorr.yaml
>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,ccorr.yaml
>> @@ -54,6 +54,27 @@ properties:
>> $ref: /schemas/types.yaml#/definitions/phandle-array
>> maxItems: 1
>>
>> + ports:
>> + $ref: /schemas/graph.yaml#/properties/ports
>> + description:
>> + Input and output ports can have multiple endpoints, each of those
>> + connects to either the primary, secondary, etc, display pipeline.
>> +
>> + properties:
>> + port@0:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description: CCORR input port
>> +
>> + port@1:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description:
>> + CCORR output to the input of the next desired component in the
>> + display pipeline, usually only one of the available AAL blocks.
>> +
>> + required:
>> + - port@0
>> + - port@1
>> +
>> required:
>> - compatible
>> - reg
>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,color.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,color.yaml
>> index b886ca0d89ea..61d040a10c08 100644
>> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,color.yaml
>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,color.yaml
>> @@ -64,6 +64,28 @@ properties:
>> $ref: /schemas/types.yaml#/definitions/phandle-array
>> maxItems: 1
>>
>> + ports:
>> + $ref: /schemas/graph.yaml#/properties/ports
>> + description:
>> + Input and output ports can have multiple endpoints, each of those
>> + connects to either the primary, secondary, etc, display pipeline.
>> +
>> + properties:
>> + port@0:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description: COLOR input port
>> +
>> + port@1:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description:
>> + COLOR output to the input of the next desired component in the
>> + display pipeline, for example one of the available CCORR or AAL
>> + blocks.
>> +
>> + required:
>> + - port@0
>> + - port@1
>> +
>> required:
>> - compatible
>> - reg
>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dither.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,dither.yaml
>> index 1588b3f7cec7..3d4ab3f86294 100644
>> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dither.yaml
>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dither.yaml
>> @@ -55,6 +55,28 @@ properties:
>> $ref: /schemas/types.yaml#/definitions/phandle-array
>> maxItems: 1
>>
>> + ports:
>> + $ref: /schemas/graph.yaml#/properties/ports
>> + description:
>> + Input and output ports can have multiple endpoints, each of those
>> + connects to either the primary, secondary, etc, display pipeline.
>> +
>> + properties:
>> + port@0:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description: DITHER input, usually from a POSTMASK or GAMMA block.
>> +
>> + port@1:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description:
>> + DITHER output to the input of the next desired component in the
>> + display pipeline, for example one of the available DSC compressors,
>> + DP_INTF, DSI, LVDS or others.
>> +
>> + required:
>> + - port@0
>> + - port@1
>> +
>> required:
>> - compatible
>> - reg
>> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml
>> index 803c00f26206..6607cb1c6e0a 100644
>> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml
>> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.yaml
>> @@ -64,13 +64,34 @@ properties:
>> Output port node. This port should be connected to the input port of an
>> attached HDMI, LVDS or DisplayPort encoder chip.
>>
>> + ports:
>> + $ref: /schemas/graph.yaml#/properties/ports
>> +
>> + properties:
>> + port@0:
>> + $ref: /schemas/graph.yaml#/properties/port
>> + description: DPI input port
>
> Strictly speaking, 'port' is equivalent to 'port@0', so it is already
> defined to be the output path. It is a little odd for the input to be
> port@1, but that is why we define the numbering.
>
> Same comment applies to DSI.
>
> Rob
Sorry Rob, but I think I didn't understand your comment here.. because the
input is port@0, not port@....
DPI/DSI/other components IN -> port@0
DPI/DSI/other components OUT -> port@1
Cheers,
Angelo
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