[PATCH v2 0/1] arm64: dts: renesas: r9a09g047e57-smarc: Enable I3C

[PATCH v2 0/1] arm64: dts: renesas: r9a09g047e57-smarc: Enable I3C

[Tommaso Merciai]

Dear all,

This patch enable I3C support to the rzg3e-smarc-som.dtsi.
Tested using NXP P3T1085UK-ARD connected to the RZ/G3E SMARC SoM
via the RZ/G3E SMARC BREAKOUT board.

Using the following connections:

 RZ SMARC Carrier II (CN1)  →  RZ SMARC BREAKOUT board
 +--------------------------------------------------------+

 RZ SMARC Carrier II (PMOD1_6)  →  P3T1085UK-ARD (J9)
 +--------------------------------------------------------+
 |    PWR_PMOD1  (pin 6)    →    (pin 9)   +3V3           |
 |    GND        (pin 5)    →    (pin 7)   GND            |
 +--------------------------------------------------------+

 RZ SMARC BREAKOUT board (CN1)  →  P3T1085UK-ARD (J13)
 +--------------------------------------------------------+
 |    GND      (pin 2)    →    (pin 4)   GND              |
 |    I3C_SCL  (pin 3)    →    (pin 1)   SCL_I3C          |
 |    I3C_SDA  (pin 4)    →    (pin 2)   SDA_I3C          |
 +--------------------------------------------------------+

 The following jumpers setup is required on the P3T1085UK-ARD board:
 - JP1: 1-2
 - JP2: 1-2
 - JP3: 1-2

 The following SW1(1,2) switch setup is required on the RZ SMARC BREAKOUT
 board:
 - SW1(1): 1
 - SW1(2): 1

Thanks & Regards,
Tommaso

v1->v2:
 - Dropped overlay and moved I3C support (pure bus mode) directly to the
   rzg3e-smarc-som.dtsi as suggested by Wolfram Sang.
 - Removed alias as suggested by Wolfram Sang.

Tommaso Merciai (1):
  arm64: dts: renesas: rzg3e-smarc-som: Enable I3C support

 arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

-- 
2.43.0

[PATCH v2 1/1] arm64: dts: renesas: rzg3e-smarc-som: Enable I3C support

[Tommaso Merciai]

Enable I3C on RZ/G3E SMARC SoM.

Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
---
v1->v2:
 - Dropped overlay and moved I3C support (pure bus mode) directly to the
   rzg3e-smarc-som.dtsi as suggested by Wolfram Sang.
 - Removed alias as suggested by Wolfram Sang.

 arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
index 7faa44510d98..f05b9fec05f0 100644
--- a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
@@ -122,6 +122,14 @@ raa215300: pmic@12 {
 	};
 };
 
+&i3c {
+	pinctrl-0 = <&i3c_pins>;
+	pinctrl-names = "default";
+	i2c-scl-hz = <400000>;
+	i3c-scl-hz = <12500000>;
+	status = "okay";
+};
+
 &mdio0 {
 	phy0: ethernet-phy@7 {
 		compatible = "ethernet-phy-id0022.1640",
@@ -219,6 +227,12 @@ i2c2_pins: i2c {
 			 <RZG3E_PORT_PINMUX(3, 5, 1)>; /* SDA2 */
 	};
 
+	i3c_pins: i3c {
+		pinmux = <RZG3E_PORT_PINMUX(2, 0, 2)>, /* I3C0_SCL */
+			 <RZG3E_PORT_PINMUX(2, 1, 2)>; /* I3C0_SDA */
+		drive-push-pull;
+	};
+
 	rtc_irq_pin: rtc-irq {
 		pins = "PS1";
 		bias-pull-up;
-- 
2.43.0

Re: [PATCH v2 1/1] arm64: dts: renesas: rzg3e-smarc-som: Enable I3C support

[Wolfram Sang]

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On Thu, Nov 20, 2025 at 12:51:39PM +0100, Tommaso Merciai wrote:
> Enable I3C on RZ/G3E SMARC SoM.
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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