[PATCH v3 2/4] arm64: dts: ti: k3-am67a-beagley-ai: Add DSI0/CSI1 mux

[Jai Luthra]

The DSI0 connector is shared with the CSI1 and selectable via the
TMUX646 switch present on the board. Model it using a gpio-mux so that
camera sensor or DSI panel overlays can override it.

Link: https://docs.beagle.cc/boards/beagley/ai/03-design.html#dsi
Reviewed-by: Rishikesh Donadkar <r-donadkar at ti.com>
Signed-off-by: Jai Luthra <jai.luthra at ideasonboard.com>
---
Changes in v3:
- Add Rishikesh's R-by
- Add Link to BeagleY schematics for the DSI0 connector and mux
- No changes in the patch itself
---
 arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts b/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts
index 890d3a745375..bb1db8c6a91f 100644
--- a/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts
+++ b/arch/arm64/boot/dts/ti/k3-am67a-beagley-ai.dts
@@ -146,6 +146,19 @@ led-1 {
 			default-state = "on";
 		};
 	};
+
+	dsi_csi_mux: mux-controller {
+		compatible = "gpio-mux";
+		#mux-state-cells = <1>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&dsi_csi_mux_pins_default>;
+
+		mux-gpios = <&main_gpio0 2 GPIO_ACTIVE_HIGH>,
+			    <&main_gpio0 1 GPIO_ACTIVE_HIGH>;
+
+		/* state = SEL + 2*OE : 0 = DSI0, 1 = CSI1, 2,3 = off */
+		idle-state = <2>;
+	};
 };
 
 &main_pmx0 {
@@ -199,6 +212,13 @@ J722S_IOPAD(0x015c, PIN_INPUT, 0) /* (AD25) MDIO0_MDIO */
 		>;
 	};
 
+	dsi_csi_mux_pins_default: dsi-csi-mux-default-pins {
+		pinctrl-single,pins = <
+			J722S_IOPAD(0x0004, PIN_OUTPUT, 7) /* (L23) OSPI0_LBCLKO.GPIO0_1 */
+			J722S_IOPAD(0x0008, PIN_OUTPUT, 7) /* (L22) OSPI0_DQS.GPIO0_2 */
+		>;
+	};
+
 	rgmii1_pins_default: rgmii1-default-pins {
 		pinctrl-single,pins = <
 			J722S_IOPAD(0x014c, PIN_INPUT, 0) /* (AC25) RGMII1_RD0 */

-- 
2.54.0