[openwrt/openwrt] realtek: add mux pinctrl for rtl931x

[LEDE Commits]

svanheule pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/b03109c094e63911ee913afc91f715895c5917d8

commit b03109c094e63911ee913afc91f715895c5917d8
Author: Sander Vanheule <sander at svanheule.net>
AuthorDate: Tue Jun 7 08:42:05 2022 +0200

    realtek: add mux pinctrl for rtl931x
    
    Add a pinctrl-single node to manage the sys-led mux and JTAG mux.
    This allows using the associated pins as GPIOs:
      - sys-led: GPIO0
      - JTAG: GPIO6, GPIO7, others unknown (TDO, TDI, TMS, TCK /TRST)
    
    Suggested-by: Birger Koblitz <mail at birger-koblitz.de>
    Signed-off-by: Sander Vanheule <sander at svanheule.net>
---
 target/linux/realtek/dts-5.10/rtl931x.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/target/linux/realtek/dts-5.10/rtl931x.dtsi b/target/linux/realtek/dts-5.10/rtl931x.dtsi
index 29aee1f7b2..a5166141e6 100644
--- a/target/linux/realtek/dts-5.10/rtl931x.dtsi
+++ b/target/linux/realtek/dts-5.10/rtl931x.dtsi
@@ -155,6 +155,25 @@
 		};
 	};
 
+	pinmux: pinmux at 1b001358 {
+		compatible = "pinctrl-single";
+		reg = <0x1b001358 0x4>;
+
+		pinctrl-single,bit-per-mux;
+		pinctrl-single,register-width = <32>;
+		pinctrl-single,function-mask = <0x1>;
+		#pinctrl-cells = <2>;
+
+		/* Enable GPIO6 and GPIO7, possibly unknown others */
+		pinmux_disable_jtag: disable_jtag {
+			pinctrl-single,bits = <0x0 0x0 0x8000>;
+		};
+
+		/* Controls GPIO0 */
+		pinmux_disable_sys_led: disable_sys_led {
+			pinctrl-single,bits = <0x0 0x0 0x100>;
+		};
+	};
 
 	ethernet0: ethernet at 1b00a300 {
 		status = "okay";