video: ARM CLCD: Add DT support

This patch adds basic DT bindings for the PL11x CLCD cells
and make their fbdev driver use them.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/video/arm,pl11x.txt b/Documentation/devicetree/bindings/video/arm,pl11x.txt
new file mode 100644
index 000000000000..3e3039a8a253
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/arm,pl11x.txt
@@ -0,0 +1,109 @@
+* ARM PrimeCell Color LCD Controller PL110/PL111
+
+See also Documentation/devicetree/bindings/arm/primecell.txt
+
+Required properties:
+
+- compatible: must be one of:
+        "arm,pl110", "arm,primecell"
+        "arm,pl111", "arm,primecell"
+
+- reg: base address and size of the control registers block
+
+- interrupt-names: either the single entry "combined" representing a
+        combined interrupt output (CLCDINTR), or the four entries
+        "mbe", "vcomp", "lnbu", "fuf" representing the individual
+        CLCDMBEINTR, CLCDVCOMPINTR, CLCDLNBUINTR, CLCDFUFINTR interrupts
+
+- interrupts: contains an interrupt specifier for each entry in
+        interrupt-names
+
+- clock-names: should contain "clcdclk" and "apb_pclk"
+
+- clocks: contains phandle and clock specifier pairs for the entries
+        in the clock-names property. See
+        Documentation/devicetree/binding/clock/clock-bindings.txt
+
+Optional properties:
+
+- memory-region: phandle to a node describing memory (see
+        Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt)
+        to be used for the framebuffer; if not present, the framebuffer
+        may be located anywhere in the memory
+
+- max-memory-bandwidth: maximum bandwidth in bytes per second that the
+        cell's memory interface can handle; if not present, the memory
+        interface is fast enough to handle all possible video modes
+
+Required sub-nodes:
+
+- port: describes LCD panel signals, following the common binding
+        for video transmitter interfaces; see
+        Documentation/devicetree/bindings/media/video-interfaces.txt;
+        when it is a TFT panel, the port's endpoint must define the
+        following property:
+
+        - arm,pl11x,tft-r0g0b0-pads: an array of three 32-bit values,
+                defining the way CLD pads are wired up; first value
+                contains index of the "CLD" external pin (pad) used
+                as R0 (first bit of the red component), second value
+                index of the pad used as G0, third value index of the
+                pad used as B0, see also "LCD panel signal multiplexing
+                details" paragraphs in the PL110/PL111 Technical
+                Reference Manuals; this implicitly defines available
+                color modes, for example:
+                - PL111 TFT 4:4:4 panel:
+                        arm,pl11x,tft-r0g0b0-pads = <4 15 20>;
+                - PL110 TFT (1:)5:5:5 panel:
+                        arm,pl11x,tft-r0g0b0-pads = <1 7 13>;
+                - PL111 TFT (1:)5:5:5 panel:
+                        arm,pl11x,tft-r0g0b0-pads = <3 11 19>;
+                - PL111 TFT 5:6:5 panel:
+                        arm,pl11x,tft-r0g0b0-pads = <3 10 19>;
+                - PL110 and PL111 TFT 8:8:8 panel:
+                        arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
+                - PL110 and PL111 TFT 8:8:8 panel, R & B components swapped:
+                        arm,pl11x,tft-r0g0b0-pads = <16 8 0>;
+
+
+Example:
+
+        clcd@10020000 {
+                compatible = "arm,pl111", "arm,primecell";
+                reg = <0x10020000 0x1000>;
+                interrupt-names = "combined";
+                interrupts = <0 44 4>;
+                clocks = <&oscclk1>, <&oscclk2>;
+                clock-names = "clcdclk", "apb_pclk";
+                max-memory-bandwidth = <94371840>; /* Bps, 1024x768@60 16bpp */
+
+                port {
+                        clcd_pads: endpoint {
+                                remote-endpoint = <&clcd_panel>;
+                                arm,pl11x,tft-r0g0b0-pads = <0 8 16>;
+                        };
+                };
+
+        };
+
+        panel {
+                compatible = "panel-dpi";
+
+                port {
+                        clcd_panel: endpoint {
+                                remote-endpoint = <&clcd_pads>;
+                        };
+                };
+
+                panel-timing {
+                        clock-frequency = <25175000>;
+                        hactive = <640>;
+                        hback-porch = <40>;
+                        hfront-porch = <24>;
+                        hsync-len = <96>;
+                        vactive = <480>;
+                        vback-porch = <32>;
+                        vfront-porch = <11>;
+                        vsync-len = <2>;
+                };
+        };