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

[Tommaso Merciai]

Hi Geert,

Gentle ping on this patch.

Thanks,
Tommaso


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>
> ---
> 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

[Geert Uytterhoeven]

On Thu, 20 Nov 2025 at 12:52, Tommaso Merciai
<tommaso.merciai.xr@bp.renesas.com> wrote:
> 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.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
i.e. will queue in renesas-devel for v6.20.

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