Hi Jean-François,
A brief update.
On Tuesday 29 Nov 2016 20:41:30 Laurent Pinchart wrote:
> On Monday 28 Nov 2016 19:02:39 Jean-Francois Moine wrote:
> > Signed-off-by: Jean-Francois Moine <moinejf at free.fr>
> > ---
> >
> > .../bindings/display/sunxi/sun8i-de2.txt | 121 ++++++++++++++++
> > 1 file changed, 121 insertions(+)
> > create mode 100644
> >
> > Documentation/devicetree/bindings/display/sunxi/sun8i-de2.txt
> >
> > diff --git a/Documentation/devicetree/bindings/display/sunxi/sun8i-de2.txt
> > b/Documentation/devicetree/bindings/display/sunxi/sun8i-de2.txt new file
> > mode 100644
> > index 0000000..edf38b8
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/sunxi/sun8i-de2.txt
> > @@ -0,0 +1,121 @@
> > +Allwinner sun8i Display Engine 2 subsystem
> > +==========================================
> > +
> > +The Allwinner DE2 subsystem contains a display controller (DE2),
> > +one or two LCD controllers (Timing CONtrollers) and their external
> > +interfaces (encoders/connectors).
> > +
> > + +-----------+
> > + | DE2 |
> > + | |
> > + | +-------+ |
> > + plane --->| | | +------+
> > + | | mixer |---->| TCON |---> encoder ---> display
> > + plane --->| | | +------+ connector device
> > + | +-------+ |
> > + | |
> > + | +-------+ |
> > + plane --->| | | +------+
> > + | | mixer |---->| TCON |---> encoder ---> display
> > + plane --->| | | +------+ connector device
> > + | +-------+ |
> > + +-----------+
> > +
> > +The DE2 contains a processor which mixes the input planes and creates
> > +the images which are sent to the TCONs.
> > +From the software point of vue, there are 2 independent real-time
> > +mixers, each one being statically associated to one TCON.
> > +
> > +The TCONs adjust the image format to the one of the display device.
> > +
> > +Display controller (DE2)
> > +========================
> > +
> > +Required properties:
> > +
> > +- compatible: value should be one of the following
> > + "allwinner,sun8i-a83t-display-engine"
> > + "allwinner,sun8i-h3-display-engine"
> > +
> > +- reg: base address and size of the I/O memory
> > +
> > +- clocks: must include clock specifiers corresponding to entries in the
> > + clock-names property.
> > +
> > +- clock-names: must contain
> > + "bus": bus gate
> > + "clock": clock
> > +
> > +- resets: phandle to the reset of the device
> > +
> > +- ports: must contain a list of 2 phandles, indexed by mixer number,
> > + and pointing to display interface ports of TCONs
> > +
> > +LCD controller (TCON)
> > +=====================
> > +
> > +Required properties:
> > +
> > +- compatible: should be
> > + "allwinner,sun8i-a83t-tcon"
> > +
> > +- reg: base address and size of the I/O memory
> > +
> > +- clocks: must include clock specifiers corresponding to entries in the
> > + clock-names property.
> > +
> > +- clock-names: must contain
> > + "bus": bus gate
> > + "clock": pixel clock
> > +
> > +- resets: phandle to the reset of the device
> > +
> > +- interrupts: interrupt number for the TCON
> > +
> > +- port: port node with endpoint definitions as defined in
> > + Documentation/devicetree/bindings/media/video-interfaces.txt
> > +
> > +Example:
> > +
> > + de: de-controller at 01000000 {
> > + compatible = "allwinner,sun8i-h3-display-engine";
> > + reg = <0x01000000 0x400000>;
> > + clocks = <&ccu CLK_BUS_DE>, <&ccu CLK_DE>;
> > + clock-names = "bus", "clock";
> > + resets = <&ccu RST_BUS_DE>;
> > + ports = <&tcon0_p>, <&tcon1_p>;
>
> This isn't how the OF graph DT bindings are used. You should instead have
>
> ports {
> #address-cells = <1>;
> #size-cells = <0>;
> port at 0 {
I forgot to add reg = <0>; (and similarly for port 1).
> de_out_0: endpoint {
> remote_endpoint = <&tcon0_hdmi>;
> };
> };
> port at 1 {
> /* No endpoint as the port is not connected */
> };
> };
>
> > + };
> > +
> > + tcon0: lcd-controller at 01c0c000 {
> > + compatible = "allwinner,sun8i-a83t-tcon";
> > + reg = <0x01c0c000 0x400>;
> > + clocks = <&ccu CLK_BUS_TCON0>, <&ccu CLK_TCON0>;
> > + clock-names = "bus", "clock";
> > + resets = <&ccu RST_BUS_TCON0>;
> > + interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > + tcon0_p: port {
> > + tcon0_hdmi: endpoint {
> > + remote-endpoint = <&hdmi_tcon0>;
> > + };
> > + };
>
> and here
>
> port {
> tcon0_hdmi: endpoint {
> remote-endpoint = <&de_out_0>;
> };
> };
The TCON has an output, so this should instead be
port at 0 {
reg = <0>;
tcon0_in: endpoint {
remote-endpoint = <&de_out_0>;
};
};
port at 1 {
reg = <1>;
tcon1_out: endpoint {
remote-endpoint = <&hdmi_in>;
};
};
(the second port requires adding the HDMI encoder to the example)
> > + };
> > +
> > + /* not used */
> > + tcon1: lcd-controller at 01c0d000 {
> > + compatible = "allwinner,sun8i-h3-tcon";
> > + reg = <0x01c0d000 0x400>;
> > + clocks = <&ccu CLK_BUS_TCON1>,
> > + <&ccu CLK_TCON0>; /* no clock */
> > + clock-names = "bus", "clock";
> > + interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
> > + status = "disabled";
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > + tcon1_p: port {
> > + endpoint {
> > + /* empty */
> > + };
> > + };
>
> and here
>
> port {
> /* No endpoint as the port is not connected */
> };
>
> (although I'm not sure why you don't connect it)
>
> > + };
--
Regards,
Laurent Pinchart
