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

[Sandor Yu]

Hi Krzysztof,

Thanks your comments,

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
> Sent: 2022年11月22日 16:28
> To: Sandor Yu <sandor.yu at nxp.com>; andrzej.hajda at intel.com;
> neil.armstrong at linaro.org; robert.foss at linaro.org;
> Laurent.pinchart at ideasonboard.com; jonas at kwiboo.se;
> jernej.skrabec at gmail.com; airlied at gmail.com; daniel at ffwll.ch;
> robh+dt at kernel.org; krzysztof.kozlowski+dt at linaro.org;
> shawnguo at kernel.org; s.hauer at pengutronix.de; festevam at gmail.com;
> kishon at ti.com; vkoul at kernel.org; dri-devel at lists.freedesktop.org;
> devicetree at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> linux-kernel at vger.kernel.org; linux-phy at lists.infradead.org;
> alexander.stein at ew.tq-group.com
> Cc: kernel at pengutronix.de; dl-linux-imx <linux-imx at nxp.com>; Oliver Brown
> <oliver.brown at nxp.com>
> 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 at nxp.com>
> > ---
> >  .../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
> > +---
> > +$id:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fschemas%2Fdisplay%2Fbridge%2Fcdns%2Cmhdp-imx8mq-dp.
> yaml%
> >
> +23&data=05%7C01%7CSandor.yu%40nxp.com%7C163690c8a8ab4f7a6
> c9208dac
> >
> +c6373c4%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6380470
> 247542869
> >
> +46%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM
> zIiLCJBTi
> >
> +I6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Eei5Nkp0
> Hl8SHpBLZU
> > +1HsJDnWQujHvmPh2XMuC%2BSZ58%3D&reserved=0
> > +$schema:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fmeta-schemas%2Fcore.yaml%23&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&sdata=eZUnepnQHS9ewyWb9AHMht%2F%2BevutmOt
> mTajL%2B5Ewwbs
> > +%3D&reserved=0
> > +
> > +title: Cadence MHDP Displayport bridge
> > +
> > +maintainers:
> > +  - Sandor Yu <Sandor.yu at nxp.com>
> > +
> > +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 at 0:
> > +        $ref: /schemas/graph.yaml#/properties/port
> > +        description:
> > +          Input port from display controller output.
> > +      port at 1:
> > +        $ref: /schemas/graph.yaml#/properties/port
> > +        description:
> > +          Output port to DP connector.
> > +
> > +    required:
> > +      - port at 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 at 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 at 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