From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Enable I2C0 and I2C1 on the RZ/N2H evaluation board.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v1->v2:
- Replaced RZN2H_PORT_PINMUX with RZT2H_PORT_PINMUX
- Corrected switch settings for I2C1
---
 .../dts/renesas/r9a09g087m44-rzn2h-evk.dts    | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
index fb2651c4c338..a068661fc442 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
@@ -10,6 +10,14 @@
 #include "r9a09g087m44.dtsi"
 #include "rzt2h-n2h-evk-common.dtsi"
 
+/*
+ * I2C0 and LED8/9 share the same pins use the below
+ * macro to choose (and set approopriate DIP switches).
+ */
+#define I2C0	1
+#define LED8	(!I2C0)
+#define LED9	(!I2C0)
+
 / {
 	model = "Renesas RZ/N2H EVK Board based on r9a09g087m44";
 	compatible = "renesas,rzn2h-evk", "renesas,r9a09g087m44", "renesas,r9a09g087";
@@ -60,6 +68,7 @@ led-7 {
 			function-enumerator = <8>;
 		};
 
+#if LED8
 		led-8 {
 			/*
 			 * USER_LED0
@@ -70,7 +79,9 @@ led-8 {
 			function = LED_FUNCTION_DEBUG;
 			function-enumerator = <0>;
 		};
+#endif
 
+#if LED9
 		led-9 {
 			/*
 			 * USER_LED1
@@ -81,6 +92,7 @@ led-9 {
 			function = LED_FUNCTION_DEBUG;
 			function-enumerator = <1>;
 		};
+#endif
 
 		led-10 {
 			/*
@@ -105,3 +117,47 @@ led-11 {
 		};
 	};
 };
+
+#if I2C0
+&i2c0 {
+	pinctrl-0 = <&i2c0_pins>;
+	pinctrl-names = "default";
+	clock-frequency = <400000>;
+	status = "okay";
+};
+#endif
+
+&i2c1 {
+	pinctrl-0 = <&i2c1_pins>;
+	pinctrl-names = "default";
+	clock-frequency = <400000>;
+	status = "okay";
+};
+
+&pinctrl {
+	/*
+	 * I2C0 Pin Configuration:
+	 * ------------------------
+	 * Signal | Pin     | DSW15
+	 * -------|---------|--------------
+	 * SCL    | P14_6   | 8: OFF, 9: ON, 10: OFF
+	 * SDA    | P14_7   | 5: ON, 6: OFF
+	 */
+	i2c0_pins: i2c0-pins {
+		pinmux = <RZT2H_PORT_PINMUX(14, 6, 0x17)>,
+			 <RZT2H_PORT_PINMUX(14, 7, 0x17)>;
+	};
+
+	/*
+	 * I2C1 Pin Configuration:
+	 * ------------------------
+	 * Signal | Pin     | DSW7
+	 * -------|---------|--------------
+	 * SCL    | P03_3   | 1: ON, 2: OFF
+	 * SDA    | P03_4   | 3: ON, 4: OFF
+	 */
+	i2c1_pins: i2c1-pins {
+		pinmux = <RZT2H_PORT_PINMUX(3, 3, 0x17)>,
+			 <RZT2H_PORT_PINMUX(3, 4, 0x17)>;
+	};
+};
-- 
2.51.0

On Wed, 20 Aug 2025 at 22:07, Prabhakar <prabhakar.csengg@gmail.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
>
> Enable I2C0 and I2C1 on the RZ/N2H evaluation board.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v1->v2:
> - Replaced RZN2H_PORT_PINMUX with RZT2H_PORT_PINMUX
> - Corrected switch settings for I2C1

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-devel for v6.18.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds