ARM: dts: sun9i: Enable uart4 for A80 Optimus board

The A80 Optimus board exposes uart4 on the GPIO expansion header.
Enable it so we can use it.

Also enable the internal pull-ups, as there doesn't seem to be
external pull-up resistors for pins on the expansion header.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/sun9i-a80-optimus.dts b/arch/arm/boot/dts/sun9i-a80-optimus.dts
index 87b1355e3cd7..506948f582ee 100644
--- a/arch/arm/boot/dts/sun9i-a80-optimus.dts
+++ b/arch/arm/boot/dts/sun9i-a80-optimus.dts
@@ -71,6 +71,11 @@
                                 allwinner,drive = <0>;
                                 allwinner,pull = <0>;
                         };
+
+                        uart4_pins_a: uart4@0 {
+                                /* Enable internal pull-up */
+                                allwinner,pull = <1>;
+                        };
                 };
 
                 uart0: serial@07000000 {
@@ -79,6 +84,12 @@
                         status = "okay";
                 };
 
+                uart4: serial@07001000 {
+                        pinctrl-names = "default";
+                        pinctrl-0 = <&uart4_pins_a>;
+                        status = "okay";
+                };
+
                 i2c3: i2c@07003400 {
                         pinctrl-names = "default";
                         pinctrl-0 = <&i2c3_pins_a>;