linux-kernel - RE: [EXT] Re: [v1 1/4] dt-bindings: display: Add DT bindings for LS1028A HDP-TX PHY.

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Date:   Mon, 17 Jun 2019 01:45:04 +0000
From:   Wen He <wen.he_1@....com>
To:     Rob Herring <robh@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>
Subject: RE: [EXT] Re: [v1 1/4] dt-bindings: display: Add DT bindings for
 LS1028A HDP-TX PHY.



> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: 2019年6月14日 4:08
> To: Wen He <wen.he_1@....com>
> Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; shawnguo@...nel.org; Leo Li
> <leoyang.li@....com>
> Subject: [EXT] Re: [v1 1/4] dt-bindings: display: Add DT bindings for LS1028A
> HDP-TX PHY.
> 
> Caution: EXT Email
> 
> On Wed, May 08, 2019 at 10:35:25AM +0000, Wen He wrote:
> > Add DT bindings documentmation for the HDP-TX PHY controller. The
> > describes which could be found on NXP Layerscape ls1028a platform.
> 
> Drop the hard stop (.) from the subject.
> 
> >
> > Signed-off-by: Wen He <wen.he_1@....com>
> > ---
> >  .../devicetree/bindings/display/fsl,hdp.txt   | 56 +++++++++++++++++++
> >  1 file changed, 56 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/display/fsl,hdp.txt
> >
> > diff --git a/Documentation/devicetree/bindings/display/fsl,hdp.txt
> > b/Documentation/devicetree/bindings/display/fsl,hdp.txt
> > new file mode 100644
> > index 000000000000..36b5687a1261
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/fsl,hdp.txt
> > @@ -0,0 +1,56 @@
> > +NXP Layerscpae ls1028a HDP-TX PHY Controller
> > +============================================
> > +
> > +The following bindings describe the Cadence HDP TX PHY on ls1028a
> > +that offer multi-protocol support of standars such as eDP and
> > +Displayport, supports for 25-600MHz pixel clock and up to 4k2k at 60MHz
> resolution.
> > +The HDP transmitter is a Cadence HDP TX controller IP with a
> > +companion PHY IP.
> 
> I'm confused. This binding covers both blocks or is just one of them?
> 

Hi Rob,

This binding covers both blocks(HDP TX PHY and HDP TX Controller), 
Because they are belong to the one IP.

> > +
> > +Required properties:
> > +  - compatible:   Should be "fsl,ls1028a-dp" for ls1028a.
> > +  - reg:          Physical base address and size of the block of registers
> used
> > +  by the processor.
> > +  - interrupts:   HDP hotplug in/out detect interrupt number
> > +  - clocks:       A list of phandle + clock-specifier pairs, one for each
> entry
> > +  in 'clock-names'
> > +  - clock-names:  A list of clock names. It should contain:
> > +      - "clk_ipg": inter-Integrated circuit clock
> > +      - "clk_core": for the Main Display TX controller clock
> > +      - "clk_pxl": for the pixel clock feeding the output PLL of the processor
> > +      - "clk_pxl_mux": for the high PerfPLL bypass clock
> > +      - "clk_pxl_link": for the link rate pixel clock
> > +      - "clk_apb": for the APB interface clock
> > +      - "clk_vif": for the Video pixel clock
> 
> The 'clk_' part is redundant.
> 

You mean should I remove these 'clk_' part?

Thanks for the review.

Best Regards,
Wen

> > +
> > +Required sub-nodes:
> > +  - port: The HDP connection to an encoder output port. The connection
> > +    is modelled using the OF graph bindings specified in
> > +    Documentation/devicetree/bindings/graph.txt
> > +
> > +
> > +Example:
> > +
> > +/ {
> > +        ...
> > +
> > +     hdp: display@...0000 {
> > +                compatible = "fsl,ls1028a-dp";
> > +             reg = <0x0 0xf1f0000 0x0 0xffff>,
> > +                 <0x0 0xf200000 0x0 0xfffff>;
> > +                interrupts = <0 221 IRQ_TYPE_LEVEL_HIGH>;
> > +             clocks = <&sysclk>, <&hdpclk>, <&dpclk>,
> > +                         <&dpclk>, <&dpclk>, <&pclk>, <&dpclk>;
> > +             clock-names = "clk_ipg", "clk_core", "clk_pxl",
> > +                              "clk_pxl_mux", "clk_pxl_link", "clk_apb",
> > +                              "clk_vif";
> > +
> > +             port {
> > +                     dp1_output: endpoint {
> > +                             remote-endpoint = <&dp0_input>;
> > +                     };
> > +             };
> > +        };
> > +
> > +        ...
> > +};
> > --
> > 2.17.1
> >