[PATCH linux dev-4.13 v2] 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

We don't need the reg property, so remove it and the unit name.

OpenBMC-Staging-Count: 1
Reviewed-by: Andrew Jeffery <andrew at aj.id.au>
Signed-off-by: Joel Stanley <joel at jms.id.au>
---
v2: Consolidate the two SCU scratch register nodes into one

 arch/arm/boot/dts/aspeed-g5.dtsi | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
index 4ca4bc463347..01b66359e6d6 100644
--- a/arch/arm/boot/dts/aspeed-g5.dtsi
+++ b/arch/arm/boot/dts/aspeed-g5.dtsi
@@ -158,9 +158,8 @@
 
 				};
 
-				vga_scratch: scratch at 50 {
+				vga_scratch: scratch {
 					compatible = "aspeed,bmc-misc";
-					reg = <0x50 0x20>;
 				};
 
 				hwrng at 78 {
@@ -1441,6 +1440,11 @@
 };
 
 &vga_scratch {
+	dac_mux {
+		offset = <0x2c>;
+		bit-mask = <0x3>;
+		bit-shift = <16>;
+	};
 	vga0 {
 		offset = <0x50>;
 		bit-mask = <0xffffffff>;
-- 
2.17.0