arm64: dts: allwinner: a64: add simplefb for A64 SoC

The A64 SoC features two display pipelines, one has a LCD output, the
other has a HDMI output.

Add support for simplefb for the LCD output. Tested on Teres I.

This patch was inspired by work of Icenowy Zheng.

Signed-off-by: Harald Geyer <harald@ccbib.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 8401e7f887ff..1b2ef28c42bd 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -52,6 +52,26 @@
         #address-cells = <1>;
         #size-cells = <1>;
 
+        chosen {
+                #address-cells = <1>;
+                #size-cells = <1>;
+                ranges;
+
+/*
+ * The pipeline mixer0-lcd0 depends on clock CLK_MIXER0 from DE2 CCU.
+ * However there is no support for this clock on A64 yet, so we depend
+ * on the upstream clocks here to keep them (and thus CLK_MIXER0) up.
+ */
+                simplefb_lcd: framebuffer-lcd {
+                        compatible = "allwinner,simple-framebuffer",
+                                     "simple-framebuffer";
+                        allwinner,pipeline = "mixer0-lcd0";
+                        clocks = <&ccu CLK_TCON0>,
+                                 <&ccu CLK_DE>, <&ccu CLK_BUS_DE>;
+                        status = "disabled";
+                };
+        };
+
         cpus {
                 #address-cells = <1>;
                 #size-cells = <0>;