On Fri, Feb 19, 2016 at 04:03:52PM +0300, Alexey Brodkin wrote:
> This add DT bindings documentation for ARC PGU display controller.
>
> Signed-off-by: Alexey Brodkin <abrodkin@xxxxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Pawel Moll <pawel.moll@xxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
> Cc: Kumar Gala <galak@xxxxxxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: linux-snps-arc@xxxxxxxxxxxxxxxxxxx
> ---
> .../devicetree/bindings/display/snps,arcpgu.txt | 74 ++++++++++++++++++++++
> 1 file changed, 74 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/snps,arcpgu.txt
>
> diff --git a/Documentation/devicetree/bindings/display/snps,arcpgu.txt b/Documentation/devicetree/bindings/display/snps,arcpgu.txt
> new file mode 100644
> index 0000000..c8382fb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/snps,arcpgu.txt
> @@ -0,0 +1,74 @@
> +ARC PGU
> +
> +This is a display controller found on several development boards produced
> +by Synopsys. The ARC PGU is an RGB streamer that reads the data from a
> +framebuffer and sends it to a single digital encoder (usually HDMI).
> +
> +Required properties:
> + - compatible: "snps,arcpgu"
Seems like this should be more specific. Is there some sort or
versioning with ARC blocks?
> + - reg: Physical base address and length of the controller's registers.
> + - clocks: A list of phandle + clock-specifier pairs, one for each
> + entry in 'clock-names'.
> + - clock-names: A list of clock names. For ARC PGU it should contain:
> + - "pxlclk" for the clock feeding the output PLL of the controller.
> + - encoder-slave: Phandle of encoder chip.
This is unnecessary with the OF graph.
> +
> +Required sub-nodes:
> + - port: The PGU connection to an encoder chip. The connection is modelled
> + using the OF graph bindings specified in
> + Documentation/devicetree/bindings/graph.txt.
> +
> +Example:
> +
> +/ {
> + ...
> +
> + pgu@0xXXXXXXXX {
Unit address should not have '0x'
> + compatible = "snps,arcpgu";
> + reg = <0xXXXXXXXX 0x400>;
> + clocks = <&clock_node>;
> + clock-names = "pxlclk";
> + encoder-slave = <&encoder_node>;
> +
> + port {
> + pgu_output: endpoint {
> + remote-endpoint = <&hdmi_enc_input>;
> + };
> + };
> + };
> +
> + /* HDMI encoder on I2C bus */
> + i2c@0xXXXXXXXX {
> + compatible = "...";
> +
> + encoder_node:encoder_node@0xXXXXXXXX{
I2C addresses would be 8-bit only.
> + compatible="...";
> +
> + ports {
> + port@0 {
> + reg = <0>;
> + hdmi_enc_input:endpoint {
> + remote-endpoint = <&pgu_output>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> + hdmi_enc_output:endpoint {
> + remote-endpoint = <&hdmi_connector_in>;
> + };
> + };
> + };
> + };
> + }
> +
> + hdmi0: connector {
> + compatible = "hdmi-connector";
> +
> + port {
> + hdmi_connector_in: endpoint {
> + remote-endpoint = <&hdmi_enc_output>;
> + };
> + };
> + };
> +};
> --
> 2.5.0
>
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