Re: [PATCH v15 01/11] dt-bindings: mediatek,dp: Add Display Port binding

[Rex-BC Chen <rex-bc.chen@mediatek.com>]

On Wed, 2022-07-27 at 09:23 +0200, Krzysztof Kozlowski wrote:
> On 27/07/2022 06:50, Bo-Chen Chen wrote:
> > From: Markus Schneider-Pargmann <msp@baylibre.com>
> > 
> > This controller is present on several mediatek hardware. Currently
> > mt8195 and mt8395 have this controller without a functional
> > difference,
> > so only one compatible field is added.
> > 
> > The controller can have two forms, as a normal display port and as
> > an
> > embedded display port.
> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> > ---
> >  .../display/mediatek/mediatek,dp.yaml         | 117
> > ++++++++++++++++++
> >  1 file changed, 117 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.ya
> > ml
> > b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.ya
> > ml
> > new file mode 100644
> > index 000000000000..fd68c6c08df3
> > --- /dev/null
> > +++
> > b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.ya
> > ml
> > @@ -0,0 +1,117 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: 
> > https://urldefense.com/v3/__http://devicetree.org/schemas/display/mediatek/mediatek,dp.yaml*__;Iw!!CTRNKA9wMg0ARbw!wfsojIGZI_UYOhzgZxHy9ndUMC78GcAtJV-oZkD4DNXz0NE58uCHPE_MRZIyljEjrpwP$
> >  
> > +$schema: 
> > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!wfsojIGZI_UYOhzgZxHy9ndUMC78GcAtJV-oZkD4DNXz0NE58uCHPE_MRZIylldgseRE$
> >  
> > +
> > +title: MediaTek Display Port Controller
> > +
> > +maintainers:
> > +  - Chun-Kuang Hu <chunkuang.hu@kernel.org>
> > +  - Jitao shi <jitao.shi@mediatek.com>
> > +
> > +description: |
> > +  Device tree bindings for the MediaTek display port TX (DP) and
> > +  embedded display port TX (eDP) controller present on some
> > MediaTek SoCs.
> 
> Drop entire sentence and just describe the hardware.
> 
> > +  We just need to enable the power domain of DP. The clock of DP
> > is
> > +  generated by itself and we are not using other PLL to generate
> > clocks.
> > +  MediaTek DP and eDP are different hardwares and there are some
> > features
> > +  which are not supported for eDP. For example, audio is not
> > supported for
> > +  eDP. Therefore, we need to use two different compatibles to
> > describe them.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - mediatek,mt8195-dp-tx
> > +      - mediatek,mt8195-edp-tx
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  nvmem-cells:
> > +    maxItems: 1
> > +    description: efuse data for display port calibration
> > +
> > +  nvmem-cell-names:
> > +    const: dp_calibration_data
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  ports:
> > +    $ref: /schemas/graph.yaml#/properties/ports
> > +    properties:
> > +      port@0:
> > +        $ref: /schemas/graph.yaml#/properties/port
> > +        description: Input endpoint of the controller, usually
> > dp_intf
> > +
> > +      port@1:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: Output endpoint of the controller
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/media/video-interfaces.yaml#
> > +            unevaluatedProperties: false
> > +            properties:
> > +              data-lanes:
> > +                description: |
> > +                  number of lanes supported by the hardware.
> > +                  The possible values:
> > +                  0       - For 1 lane enabled in IP.
> > +                  0 1     - For 2 lanes enabled in IP.
> > +                  0 1 2 3 - For 4 lanes enabled in IP.
> > +                minItems: 1
> > +                maxItems: 4
> > +            required:
> > +              - data-lanes
> > +
> > +    required:
> > +      - port@0
> > +      - port@1
> > +
> > +  max-linkrate-mhz:
> > +    enum: [ 1620, 2700, 5400, 8100 ]
> > +    description: maximum link rate supported by the hardware.
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - ports
> > +  - max-linkrate-mhz
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    #include <dt-bindings/power/mt8195-power.h>
> > +    dp_tx@1c600000 {
> 
> No underscores in node names, so just "dp".
> 
> Best regards,
> Krzysztof

Hello Krzysztof,

Thanks for your review.
I will modify these in next version.

BRs,
Bo-Chen