Re: [PATCH v2 4/5] dt-bindings: display: Add STM32 DSI host driver

[Rob Herring <robh@xxxxxxxxxx>]

On Fri, May 19, 2017 at 05:20:17PM +0200, Philippe CORNU wrote:
> This patch adds documentation of device tree bindings for the STM32
> DSI host driver based on the Synopsys DW MIPI DSI driver from Rockchip.
> 
> Signed-off-by: Philippe CORNU <philippe.cornu@xxxxxx>
> ---
>  .../devicetree/bindings/display/st,stm32-ltdc.txt  | 102 ++++++++++++++++++++-
>  1 file changed, 100 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt b/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
> index 8e14769..18a57a2 100644
> --- a/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
> +++ b/Documentation/devicetree/bindings/display/st,stm32-ltdc.txt
> @@ -1,7 +1,6 @@
>  * STMicroelectronics STM32 lcd-tft display controller
>  
>  - ltdc: lcd-tft display controller host
> -  must be a sub-node of st-display-subsystem
>    Required properties:
>    - compatible: "st,stm32-ltdc"
>    - reg: Physical base address of the IP registers and length of memory mapped region.
> @@ -13,8 +12,37 @@
>    Required nodes:
>      - Video port for RGB output.
>  
> -Example:
> +* STMicroelectronics STM32 specific extensions to Synopsys DesignWare MIPI DSI
>  
> +Required properties:
> +- #address-cells: Should be <1>.
> +- #size-cells: Should be <0>.
> +- compatible: "st,stm32-dsi".
> +- reg: Memory mapped base address and length of the DWC MIPI DSI registers.
> +- clocks: References to all the clocks specified in the clock-names property
> +  as specified in [1].
> +- clock-names: The DWC MIPI DSI host uses the following clocks.
> +  - "pclk" is the peripheral clock for either AHB and APB (mandatory).
> +  - "ref" is the pll reference clock (mandatory).

Just "See [5]" is enough description here.

> +- resets: References to all the resets specified in the reset-names property
> +  as specified in [2]. (optional)
> +- reset-names: string reset name, must be "apb" if used. (optional)
> +- ports: The connectivity of the DWC MIPI DSI host controller
> +  with the rest of the system is expressed in using ports as specified in the
> +  device graph bindings in [2].
> +  - port@0 is the dsi input, connected to the ltdc output port.
> +  - port@1 is the dsi output, connected to the dsi panel or bridge.
> +
> +Note: You can find more documentation related to the Synopsys DesignWare MIPI
> +DSI host controller in [5].
> +
> +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
> +[2] Documentation/devicetree/bindings/reset/reset.txt
> +[3] Documentation/devicetree/bindings/media/video-interfaces.txt
> +[4] Documentation/devicetree/bindings/graph.txt
> +[5] Documentation/devicetree/bindings/display/bridge/dw_mipi_dsi.txt
> +
> +Example 1: RGB panel
>  / {
>  	...
>  	soc {
> @@ -34,3 +62,73 @@ Example:
>  		};
>  	};
>  };
> +
> +Example 2: DSI panel
> +
> +/ {
> +	...
> +	soc {
> +	...
> +		ltdc: display-controller@40016800 {
> +			compatible = "st,stm32-ltdc";
> +			reg = <0x40016800 0x200>;
> +			interrupts = <88>, <89>;
> +			resets = <&rcc STM32F4_APB2_RESET(LTDC)>;
> +			clocks = <&rcc 1 CLK_LCD>;
> +			clock-names = "lcd";
> +
> +			port {
> +				ltdc_out_dsi: endpoint {
> +					remote-endpoint = <&dsi_in>;
> +				};
> +			};
> +		};
> +
> +
> +		dsi: dsi@40016C00 {

nit: lowercase hex

> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			compatible = "st,stm32-dsi";
> +			reg = <0x40016C00 0x800>;

here too.

> +			clocks = <&rcc 1 CLK_F469_DSI>, <&clk_hse>;
> +			clock-names = "ref", "pclk";
> +			resets = <&rcc STM32F4_APB2_RESET(DSI)>;
> +			reset-names = "apb";
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +					dsi_in: endpoint {
> +						remote-endpoint = <&ltdc_out_dsi>;
> +					};
> +				};
> +
> +				port@1 {
> +					reg = <1>;
> +					dsi_out_panel: endpoint {
> +						remote-endpoint = <&dsi_in_panel>;
> +					};
> +				};
> +
> +			};
> +
> +			panel-dsi@0 {
> +				reg = <0>; /* dsi virtual channel (0..3) */
> +				compatible = ...;
> +				enable-gpios = ...;
> +
> +				port {
> +					dsi_in_panel: endpoint {
> +						remote-endpoint = <&dsi_out_panel>;
> +					};
> +				};
> +
> +			};
> +
> +		};
> +
> +	};
> +};
> -- 
> 1.9.1
> 
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