Hi Boris.
> > +The LCDC IP exposes two subdevices:
> > + - a PWM chip: see ../pwm/atmel-lcdc-pwm.txt
> > + - a Display Controller: see ../display/atmel/lcdc-display-controller.txt
> > +
> > +Example:
> > + lcdc0: lcdc@700000 {
> > + compatible = "atmel,at91sam9263-lcdc-mfd";
> > + reg = <0x700000 0x1000>;
> > + interrupts = <26 IRQ_TYPE_LEVEL_HIGH 3>;
> > + clocks = <&lcd_clk>, <&lcd_clk>;
> > + clock-names = "lcdc_clk", "hclk";
> > +
> > + lcdc-display-controller {
> > + compatible = "atmel,lcdc-display-controller";
> > + lcd-supply = <&lcdc_reg>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + port@0 {
> > + reg = <0>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > + lcdc_panel_output: endpoint@0 {
> > + reg = <0>;
> > + remote-endpoint = <&panel_input>;
> > + };
> > + };
> > + };
> > +
> > + lcdc_pwm: lcdc-pwm {
> > + compatible = "atmel,lcdc-pwm";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&pinctrl_lcdc_pwm>;
> > + #pwm-cells = <3>;
> > + };
> > +
> > + };
>
> Also, I don't remember why I decided to declare distinct nodes for the
> PWM and display controller, but you should probably try to only declare
> the lcdc node. Something like that:
>
> lcdc0: lcdc@700000 {
> compatible = "atmel,at91sam9263-lcdc";
> reg = <0x700000 0x1000>;
> interrupts = <26 IRQ_TYPE_LEVEL_HIGH 3>;
> clocks = <&lcd_clk>, <&lcd_clk>;
> clock-names = "lcdc_clk", "hclk";
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_lcdc_pwm ...>;
> #pwm-cells = <3>;
> #address-cells = <1>;
> #size-cells = <0>;
>
> port@0 {
> reg = <0>;
> #address-cells = <1>;
> #size-cells = <0>;
> lcdc_panel_output: endpoint@0 {
> reg = <0>;
> remote-endpoint = <&panel_input>;
> };
> };
> };
>
> Note that this representation does not prevent us from having an MFD
> which declares the PWM and Display Engine, it's just that all devs will
> point to the same of_node.
I have something similar in my tree now, just need to figure out the mfd parts.
>
> > +
> > + lcdc-display-controller {
> > + compatible = "atmel,lcdc-display-controller";
> > + lcd-supply = <&lcdc_reg>;
>
> Hm, is this a regulator for the LCD controller or the LCD? If it's for
> the LCD it should be placed under the panel node.
It was added only because I could do it and I was (and continue to be) a
DT newbie. Will drop it in v2 as this is just an example which this part do
not add any value to.
> > + panel: panel {
> > + compatible = "logictechnologies,lttd800480070-l2rt", "simple-panel";
Reminds me that I need to dig out a panel-simple patch for a few
displays I use (logic + seiko).
But they are otherwise not related to this work.
Sam
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