From 835666e7403c3ddc6f3122888d975464f8272efe Mon Sep 17 00:00:00 2001
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: Sat, 29 Nov 2025 18:51:58 +0000
Subject: [PATCH] arm64: dts: renesas: r9a09g047e57-smarc: Enable rsci{2,4,9}
 nodes

Enable device rsci{2,4,9} nodes for the RZ/G3E SMARC EVK.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251129185203.380002-4-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 .../boot/dts/renesas/r9a09g047e57-smarc.dts   | 58 +++++++++++++++++++
 .../boot/dts/renesas/renesas-smarc2.dtsi      |  7 +++
 .../boot/dts/renesas/rzg3e-smarc-som.dtsi     |  4 ++
 3 files changed, 69 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts b/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
index 50e075745474a..696903dc7a636 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
@@ -12,6 +12,8 @@
 #define SW_GPIO9_CAN1_STB	0
 #define SW_LCD_EN		0
 #define SW_PDM_EN		0
+#define SW_SER0_PMOD		1
+#define SW_SER2_EN		1
 #define SW_SD0_DEV_SEL		0
 #define SW_SDIO_M2E		0
 
@@ -37,6 +39,9 @@
 
 	aliases {
 		i2c0 = &i2c0;
+		serial0 = &rsci4;
+		serial1 = &rsci9;
+		serial2 = &rsci2;
 		serial3 = &scif0;
 		mmc1 = &sdhi1;
 	};
@@ -140,6 +145,28 @@
 		input-schmitt-enable;
 	};
 
+	rsci2_pins: rsci2 {
+		pinmux = <RZG3E_PORT_PINMUX(1, 0, 1)>, /* RXD2 */
+			 <RZG3E_PORT_PINMUX(1, 1, 1)>, /* TXD2 */
+			 <RZG3E_PORT_PINMUX(1, 2, 6)>, /* CTS2N */
+			 <RZG3E_PORT_PINMUX(1, 3, 1)>; /* RTS2N */
+		bias-pull-up;
+	};
+
+	rsci4_pins: rsci4 {
+		pinmux = <RZG3E_PORT_PINMUX(7, 6, 5)>, /* RXD4 */
+			 <RZG3E_PORT_PINMUX(7, 7, 5)>, /* TXD4 */
+			 <RZG3E_PORT_PINMUX(8, 0, 6)>, /* CTS4N */
+			 <RZG3E_PORT_PINMUX(8, 1, 5)>; /* RTS4N */
+		bias-pull-up;
+	};
+
+	rsci9_pins: rsci9 {
+		pinmux = <RZG3E_PORT_PINMUX(8, 2, 5)>, /* RXD9 */
+			 <RZG3E_PORT_PINMUX(8, 3, 5)>; /* TXD9 */
+		bias-pull-up;
+	};
+
 	scif_pins: scif {
 		pins = "SCIF_TXD", "SCIF_RXD";
 		renesas,output-impedance = <1>;
@@ -176,6 +203,37 @@
 	};
 };
 
+#if SW_SER0_PMOD && SW_SER2_EN
+&rsci2 {
+	pinctrl-0 = <&rsci2_pins>;
+	pinctrl-names = "default";
+
+	uart-has-rtscts;
+
+	status = "okay";
+};
+#endif
+
+#if (!SW_LCD_EN) && (SW_SER0_PMOD)
+&rsci4 {
+	pinctrl-0 = <&rsci4_pins>;
+	pinctrl-names = "default";
+
+	uart-has-rtscts;
+
+	status = "okay";
+};
+#endif
+
+#if (!SW_LCD_EN)
+&rsci9 {
+	pinctrl-0 = <&rsci9_pins>;
+	pinctrl-names = "default";
+
+	status = "okay";
+};
+#endif
+
 &scif0 {
 	pinctrl-0 = <&scif_pins>;
 	pinctrl-names = "default";
diff --git a/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi b/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi
index a6e8eb7300966..b607b5d6c259e 100644
--- a/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi
+++ b/arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi
@@ -13,6 +13,13 @@
  *     0 - SMARC SDIO signal is connected to uSD1
  *     1 - SMARC SDIO signal is connected to M.2 Key E connector
  *
+ * Please set the switch position SW_OPT_MUX.4 on the carrier board and the
+ * corresponding macro SW_SER0_PMOD on the board DTS:
+ *
+ * SW_SER0_PMOD:
+ *     0 - SER0 signals connect to M.2 Key-E, SER2 signals are unconnected
+ *     1 - SER0 signals connect to PMOD, SER2 signals connect to M.2 Key-E
+ *
  * Please set the switch position SW_GPIO_CAN_PMOD on the carrier board and the
  * corresponding macro SW_GPIO8_CAN0_STB/SW_GPIO8_CAN0_STB on the board DTS:
  *
diff --git a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
index 7faa44510d988..eb0de21d6716c 100644
--- a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
@@ -13,6 +13,10 @@
  *      0 - SD0 is connected to eMMC (default)
  *      1 - SD0 is connected to uSD0 card
  *
+ * Switch position SYS.4, Macro SW_SER2_EN:
+ *      0 - Select Module DSI connector(GPIO)
+ *      1 - Select SER2
+ *
  * Switch position SYS.5, Macro SW_LCD_EN:
  *      0 - Select Misc. Signals routing
  *      1 - Select LCD
-- 
2.47.3