[PATCH linux dev-4.13] ARM: dts: aspeed-g5: Add DAC MUX userspace control

[Joel Stanley]

This exposes SCU2C "Misc. Control Register" bits 16 and 17 which control
the input to the VGA DAC. They are used to select which graphics device
drives the analog output:

  00: VGA mode (default)
  01: Graphics CRT mode
  10: Pass-through mode from Video input port-A
  11: Pass-through mode from Video input port-B

Signed-off-by: Joel Stanley <joel at jms.id.au>
---
 arch/arm/boot/dts/aspeed-g5.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
index 4ca4bc463347..83b07954644a 100644
--- a/arch/arm/boot/dts/aspeed-g5.dtsi
+++ b/arch/arm/boot/dts/aspeed-g5.dtsi
@@ -158,6 +158,15 @@
 
 				};
 
+				scratch at 2c {
+					compatible = "aspeed,bmc-misc";
+					dac_mux {
+						offset = <0x2c>;
+						bit-mask = <0x3>;
+						bit-shift = <16>;
+					};
+				};
+
 				vga_scratch: scratch at 50 {
 					compatible = "aspeed,bmc-misc";
 					reg = <0x50 0x20>;
-- 
2.17.0