Subject: Re: [PATCH v3 1/3] dt-bindings: gpu: Add ASPEED GFX bindings document

From: Rob Herring <[email-masked]>
Date: Sat, 06 Apr 2019 01:06:49 -0500

On Wed, Apr 03, 2019 at 10:49:07AM +1030, Joel Stanley wrote:
> This describes the ASPEED BMC SoC's display controller.
> 
> Signed-off-by: Joel Stanley <[email-masked]>
> Reviewed-by: Andrew Jeffery <[email-masked]>
> ---
> v3:
>  Add Andrew's reviewed-by
> 
>  .../devicetree/bindings/gpu/aspeed-gfx.txt    | 41 +++++++++++++++++++
>  1 file changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpu/aspeed-gfx.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpu/aspeed-gfx.txt b/Documentation/devicetree/bindings/gpu/aspeed-gfx.txt
> new file mode 100644
> index 000000000000..a74033332668
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/aspeed-gfx.txt
> @@ -0,0 +1,41 @@
> +Device tree configuration for the GFX display deivce on the AST2500 SoCs.
> +
> +Required properties:
> +  - compatible
> +    * Must be one of the following:
> +      + aspeed,ast2500-gfx
> +      + aspeed,ast2400-gfx
> +    * In addition, the ASPEED pinctrl bindings require the 'syscon' property to
> +      be present
> +
> +  - reg: Physical base address and length of the GFX registers
> +
> +  - interrupts: interrupt number for the GFX device
> +
> +  - clocks: clock number used to generate the pixel clock
> +
> +  - resets: reset line that must be released to use the GFX device
> +
> +  - memory-region:
> +    Phandle to a memory region to allocate from, as defined in
> +    Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt

If required, does that mean the h/w can only use certain memory? Why?

> +
> +
> +Example:
> +
> +gfx: display@1e6e6000 {
> +	compatible = "aspeed,ast2500-gfx", "syscon";
> +	reg = <0x1e6e6000 0x1000>;
> +	reg-io-width = <4>;

Not documented as used. This should be implied by the compatible though.

> +	clocks = <&syscon ASPEED_CLK_GATE_D1CLK>;
> +	resets = <&syscon ASPEED_RESET_CRT1>;
> +	interrupts = <0x19>;
> +	memory-region = <&gfx_memory>;
> +};
> +
> +gfx_memory: framebuffer {
> +	size = <0x01000000>;
> +	alignment = <0x01000000>;
> +	compatible = "shared-dma-pool";
> +	reusable;
> +};
> -- 
> 2.20.1
> 

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