RE: [EXT] Re: [PATCH v4 02/10] dt-bindings: display: bridge: Add MHDP DP for i.MX8MQ

From: Sandor Yu
Date: Tue Nov 22 2022 - 10:30:27 EST


Hi Krzysztof,

Thanks your comments,

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> Sent: 2022年11月22日 16:28
> To: Sandor Yu <sandor.yu@xxxxxxx>; andrzej.hajda@xxxxxxxxx;
> neil.armstrong@xxxxxxxxxx; robert.foss@xxxxxxxxxx;
> Laurent.pinchart@xxxxxxxxxxxxxxxx; jonas@xxxxxxxxx;
> jernej.skrabec@xxxxxxxxx; airlied@xxxxxxxxx; daniel@xxxxxxxx;
> robh+dt@xxxxxxxxxx; krzysztof.kozlowski+dt@xxxxxxxxxx;
> shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; festevam@xxxxxxxxx;
> kishon@xxxxxx; vkoul@xxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
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> linux-kernel@xxxxxxxxxxxxxxx; linux-phy@xxxxxxxxxxxxxxxxxxx;
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> Cc: kernel@xxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; Oliver Brown
> <oliver.brown@xxxxxxx>
> Subject: [EXT] Re: [PATCH v4 02/10] dt-bindings: display: bridge: Add MHDP
> DP for i.MX8MQ
>
> Caution: EXT Email
>
> On 21/11/2022 08:23, Sandor Yu wrote:
> > Add bindings for i.MX8MQ MHDP DisplayPort.
> >
> > Signed-off-by: Sandor Yu <Sandor.yu@xxxxxxx>
> > ---
> > .../display/bridge/cdns,mhdp-imx8mq-dp.yaml | 93
> +++++++++++++++++++
> > 1 file changed, 93 insertions(+)
> > create mode 100644
> >
> Documentation/devicetree/bindings/display/bridge/cdns,mhdp-imx8mq-dp.y
> > aml
> >
> > diff --git
> >
> a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp-imx8mq-dp
> > .yaml
> >
> b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp-imx8mq-dp
> > .yaml
> > new file mode 100644
> > index 000000000000..d82f3ceddaa8
> > --- /dev/null
> > +++
> b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp-imx8m
> > +++ q-dp.yaml
> > @@ -0,0 +1,93 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) %YAML 1.2
> > +---
> > +$id:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fschemas%2Fdisplay%2Fbridge%2Fcdns%2Cmhdp-imx8mq-dp.
> yaml%
> >
> +23&amp;data=05%7C01%7CSandor.yu%40nxp.com%7C163690c8a8ab4f7a6
> c9208dac
> >
> +c6373c4%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6380470
> 247542869
> >
> +46%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM
> zIiLCJBTi
> >
> +I6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=Eei5Nkp0
> Hl8SHpBLZU
> > +1HsJDnWQujHvmPh2XMuC%2BSZ58%3D&amp;reserved=0
> > +$schema:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=05%7C01%7CSa
> ndor.yu
> >
> +%40nxp.com%7C163690c8a8ab4f7a6c9208dacc6373c4%7C686ea1d3bc2b4
> c6fa92cd
> >
> +99c5c301635%7C0%7C0%7C638047024754286946%7CUnknown%7CTWFp
> bGZsb3d8eyJW
> >
> +IjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7
> C3000
> >
> +%7C%7C%7C&amp;sdata=eZUnepnQHS9ewyWb9AHMht%2F%2BevutmOt
> mTajL%2B5Ewwbs
> > +%3D&amp;reserved=0
> > +
> > +title: Cadence MHDP Displayport bridge
> > +
> > +maintainers:
> > + - Sandor Yu <Sandor.yu@xxxxxxx>
> > +
> > +description:
> > + The Cadence MHDP Displayport TX interface.
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - cdns,mhdp-imx8mq-dp
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + clocks:
> > + maxItems: 1
> > + description: MHDP DP APB clock.
> > +
> > + phys:
> > + maxItems: 1
> > +
> > + interrupts:
> > + items:
> > + - description: Hotplug cable plugin.
> > + - description: Hotplug cable plugout.
> > +
> > + interrupt-names:
> > + items:
> > + - const: plug_in
> > + - const: plug_out
> > +
> > + ports:
> > + $ref: /schemas/graph.yaml#/properties/ports
> > +
> > + properties:
> > + port@0:
> > + $ref: /schemas/graph.yaml#/properties/port
> > + description:
> > + Input port from display controller output.
> > + port@1:
> > + $ref: /schemas/graph.yaml#/properties/port
> > + description:
> > + Output port to DP connector.
> > +
> > + required:
> > + - port@0
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - clocks
> > + - interrupts
> > + - interrupt-names
> > + - phys
> > + - ports
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/clock/imx8mq-clock.h>
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > + mhdp_dp: dp-bridge@32c00000 {
> > + compatible = "cdns,mhdp-imx8mq-dp";
> > + reg = <0x32c00000 0x100000>;
> > + interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>,
> > + <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> > + interrupt-names = "plug_in", "plug_out";
> > + clocks = <&clk IMX8MQ_CLK_DISP_APB_ROOT>;
> > + phys = <&dp_phy>;
> > +
> > + ports {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > +
> > + mhdp_in: endpoint {
> > + remote-endpoint = <&dcss_out>;
> > + };
>
> As Rob suggested, you allowed property for output to DP port. However it is
> not in the example. If this is a bridge, what does it bridge if there is no output
> connector?
>
OK, I got it. Output connector will be added to the example in the next version.
Thanks,
Sandor
>
> Best regards,
> Krzysztof