linux-kernel - Re: [PATCH v2 4/7] arm64: dts: ti: k3-j721s2-common-proc-board: Add main

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Message-ID: <a5b61958-98fa-48a7-9499-b6e238c5945a@ti.com>
Date: Thu, 26 Jun 2025 15:56:14 +0530
From: "Kumar, Udit" <u-kumar1@...com>
To: Jayesh Choudhary <j-choudhary@...com>, <nm@...com>, <vigneshr@...com>,
        <devicetree@...r.kernel.org>
CC: <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devarsht@...com>, <u-kumar1@...com>
Subject: Re: [PATCH v2 4/7] arm64: dts: ti: k3-j721s2-common-proc-board: Add
 main_i2c4 instance


On 6/24/2025 1:56 PM, Jayesh Choudhary wrote:
> Add dt node for main_i2c4 instance along with required pinmuxing.
> Also add the gpio expander 'exp4' required by display connector.
>
> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
> ---
>   .../dts/ti/k3-j721s2-common-proc-board.dts    | 24 +++++++++++++++++++
>   1 file changed, 24 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> index e2fc1288ed07..793d50344fad 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
> @@ -148,6 +148,13 @@ J721S2_IOPAD(0x060, PIN_INPUT_PULLUP, 13) /* (AC27) MCASP2_AXR1.I2C3_SDA */
>   		>;
>   	};
>   
> +	main_i2c4_pins_default: main-i2c4-default-pins {
> +		pinctrl-single,pins = <
> +			J721S2_IOPAD(0x014, PIN_INPUT_PULLUP, 8) /* (AD25) I2C4_SCL */

Please check once for i2c clock, pin should be in input or output pull 
up mode.


> +			J721S2_IOPAD(0x010, PIN_INPUT_PULLUP, 8) /* (AF28) I2C4_SDA */
> +		>;
> +	};
> +
>   	main_i2c5_pins_default: main-i2c5-default-pins {
>   		pinctrl-single,pins = <
>   			J721S2_IOPAD(0x01c, PIN_INPUT, 8) /* (Y24) MCAN15_TX.I2C5_SCL */
> @@ -370,6 +377,23 @@ exp2: gpio@22 {
>   	};
>   };
>   
> +&main_i2c4 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_i2c4_pins_default>;
> +	clock-frequency = <400000>;
> +
> +	exp4: gpio@20 {
> +		compatible = "ti,tca6408";
> +		reg = <0x20>;
> +		gpio-controller;
> +		#gpio-cells = <2>;
> +		gpio-line-names = "DP0_PWR_SW_EN", "DP1_PWR_SW_EN", "UB981_PDB",
> +				  "UB981_GPIO0", "UB981_GPIO1", "UB981_GPIO2",
> +				  "UB981_GPIO3", "PWR_SW_CNTL_DSI0#";
> +	};
> +};
> +
>   &main_i2c5 {
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&main_i2c5_pins_default>;