MIPS: ingenic: rs90: Add dedicated VRAM memory region

Add a 1 MiB memory area dedicated to the video driver. This area will be
managed by Linux' CMA, so that the ingenic-drm driver can be sure to
always be able to allocate contiguous buffers.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/boot/dts/ingenic/rs90.dts b/arch/mips/boot/dts/ingenic/rs90.dts
index 4eb1edbfc155a6d226b1833746fdc994aa42863e..74fee7f01352335b7498abc5ab9474fe3b88a7e2 100644 (file)
--- a/arch/mips/boot/dts/ingenic/rs90.dts
+++ b/arch/mips/boot/dts/ingenic/rs90.dts
@@ -16,6 +16,18 @@
                reg = <0x0 0x2000000>;
        };
 
+       reserved-memory {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               vmem: video-memory@1f00000 {
+                       compatible = "shared-dma-pool";
+                       reg = <0x1f00000 0x100000>;
+                       reusable;
+               };
+       };
+
        vcc: regulator {
                compatible = "regulator-fixed";
 
@@ -300,6 +312,8 @@
 };
 
 &lcd {
+       memory-region = <&vmem>;
+
        pinctrl-names = "default";
        pinctrl-0 = <&pins_lcd>;
 };