Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Neil Armstrong narmstrong@baylibre.com --- .../bindings/display/amlogic,meson-vpu.txt | 112 +++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt
diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt new file mode 100644 index 0000000..00f74ba --- /dev/null +++ b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt @@ -0,0 +1,112 @@ +Amlogic Meson Display Controller +================================ + +The Amlogic Meson Display controller is composed of several components +that are going to be documented below: + +DMC|---------------VPU (Video Processing Unit)----------------|------HHI------| + | vd1 _______ _____________ _________________ | | +D |-------| |----| | | | | HDMI PLL | +D | vd2 | VIU | | Video Post | | Video Encoders |<---|-----VCLK | +R |-------| |----| Processing | | | | | + | osd2 | | | |---| Enci ----------|----|-----VDAC------| +R |-------| CSC |----| Scalers | | Encp ----------|----|----HDMI-TX----| +A | osd1 | | | Blenders | | Encl ----------|----|---------------| +M |-------|______|----|____________| |________________| | | +___|__________________________________________________________|_______________| + + +VIU: Video Input Unit +--------------------- + +The Video Input Unit is in charge of the pixel scanout from the DDR memory. +It fetches the frames addresses, stride and parameters from the "Canvas" memory. +This part is also in charge of the CSC (Colorspace Conversion). +It can handle 2 OSD Planes and 2 Video Planes. + +VPP: Video Post Processing +-------------------------- + +The Video Post Processing is in charge of the scaling and blending of the +various planes into a single pixel stream. +There is a special "pre-blending" used by the video planes with a dedicated +scaler and a "post-blending" to merge with the OSD Planes. +The OSD planes also have a dedicated scaler for one of the OSD. + +VENC: Video Encoders +-------------------- + +The VENC is composed of the multiple pixel encoders : + - ENCI : Interlace Video encoder for CVBS and Interlace HDMI + - ENCP : Progressive Video Encoder for HDMI + - ENCL : LCD LVDS Encoder +The VENC Unit gets a Pixel Clocks (VCLK) from a dedicated HDMI PLL and clock +tree and provides the scanout clock to the VPP and VIU. +The ENCI is connected to a single VDAC for Composite Output. +The ENCI and ENCP are connected to an on-chip HDMI Transceiver. + +Device Tree Bindings: +--------------------- + +VPU: Video Processing Unit +-------------------------- + +Required properties: +- compatible: value should be different for each SoC family as : + - GXBB (S905) : "amlogic,meson-gxbb-vpu" + - GXL (S905X, S905D) : "amlogic,meson-gxl-vpu" + - GXM (S912) : "amlogic,meson-gxm-vpu" + followed by the common "amlogic,meson-gx-vpu" +- reg: base address and size of he following memory-mapped regions : + - vpu + - hhi + - dmc +- reg-names: should contain the names of the previous memory regions +- interrupts: should contain the VENC Vsync interrupt number + +Required nodes: + +The connections to the VPU output video ports are modeled using the OF graph +bindings specified in Documentation/devicetree/bindings/graph.txt. + +The following table lists for each supported model the port number +corresponding to each VPU output. + + Port 0 Port 1 +----------------------------------------- + S905 (GXBB) CVBS VDAC HDMI-TX + S905X (GXL) CVBS VDAC HDMI-TX + S905D (GXL) CVBS VDAC HDMI-TX + S912 (GXM) CVBS VDAC HDMI-TX + +Example: + +tv-connector { + compatible = "composite-video-connector"; + + port { + tv_connector_in: endpoint { + remote-endpoint = <&cvbs_vdac_out>; + }; + }; +}; + +vpu: vpu@d0100000 { + compatible = "amlogic,meson-gxbb-vpu"; + reg = <0x0 0xd0100000 0x0 0x100000>, + <0x0 0xc883c000 0x0 0x1000>, + <0x0 0xc8838000 0x0 0x1000>; + reg-names = "vpu", "hhi", "dmc"; + interrupts = <GIC_SPI 3 IRQ_TYPE_EDGE_RISING>; + #address-cells = <1>; + #size-cells = <0>; + + /* CVBS VDAC output port */ + port@0 { + reg = <0>; + + cvbs_vdac_out: endpoint { + remote-endpoint = <&tv_connector_in>; + }; + }; +};