Re: [PATCH 1/2] dt-bindings: add bindings doc for ZTE VOU display controller

[Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On Fri, Sep 23, 2016 at 03:24:08PM +0800, Shawn Guo wrote:
> It adds initial bindings doc for ZTE VOU display controller.  HDMI is
> the only supported output device right now.
> 
> Signed-off-by: Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> ---
>  .../devicetree/bindings/display/zte,vou.txt        | 67 ++++++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/zte,vou.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/zte,vou.txt b/Documentation/devicetree/bindings/display/zte,vou.txt
> new file mode 100644
> index 000000000000..b7407219cfa1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/zte,vou.txt
> @@ -0,0 +1,67 @@
> +ZTE VOU Display Controller
> +
> +This is a display controller found on ZTE ZX296718 SoC.  It includes multiple
> +Graphic Layer (GL) and Video Layer (VL), two Mixers/Channels, and a few blocks
> +handling scaling, color space conversion etc.  VOU also integrates the support
> +for typical output devices, like HDMI, TV Encoder, VGA, and RGB LCD.
> +
> +* Master display-subsystem node
> +
> +It must be the parent node of all the sub-device nodes.
> +
> +Required properties:
> + - compatible: should be "zte,zx-display-subsystem"
> + - #address-cells: should be <1>
> + - #size-cells: should be <1>
> + - ranges: to allow probing of sub-devices
> +
> +* VOU controller device
> +
> +Required properties:
> + - compatible: should be "zte,zx296718-vou"
> + - reg: Physical base address and length of the whole VOU IO region
> + - interrupts: VOU interrupt number to the CPU
> + - 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: "aclk", "ppu_wclk",
> +   "main_wclk" and "aux_wclk".
> +
> +* HDMI output device
> +
> +Required properties:
> + - compatible: should be "zte,zx296718-hdmi"
> + - reg: Physical base address and length of the HDMI device IO region
> + - interrupts : HDMI interrupt number to the CPU
> + - 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: "osc_cec", "osc_clk"
> +   and "xclk".
> +
> +Example:
> +
> +display-subsystem {
> +	compatible = "zte,zx-display-subsystem";
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +	ranges;
> +
> +	vou: vou@1440000 {
> +		compatible = "zte,zx296718-vou";
> +		reg = <0x1440000 0x10000>;
> +		interrupts = <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&topcrm VOU_ACLK>, <&topcrm VOU_PPU_WCLK>,
> +			 <&topcrm VOU_MAIN_WCLK>, <&topcrm VOU_AUX_WCLK>;
> +		clock-names = "aclk", "ppu_wclk",
> +			      "main_wclk", "aux_wclk";
> +	};
> +
> +	hdmi: hdmi@144c000 {
> +		compatible = "zte,zx296718-hdmi";
> +		reg = <0x144c000 0x4000>;

You have overlapping regions here. I'd suggest you kill off
zte,zx-display-subsystem and make zte,zx296718-vou the top-level node 
with hdmi and others as the child nodes.

> +		interrupts = <GIC_SPI 82 IRQ_TYPE_EDGE_RISING>;
> +		clocks = <&topcrm HDMI_OSC_CEC>,
> +			 <&topcrm HDMI_OSC_CLK>,
> +			 <&topcrm HDMI_XCLK>;
> +		clock-names = "osc_cec", "osc_clk", "xclk";
> +	};
> +};
> -- 
> 1.9.1
> 
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