linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j722s-evm: Describe main

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Message-ID: <20240824181434.53m2ik3ozvc74pjf@dormitory>
Date: Sat, 24 Aug 2024 13:14:34 -0500
From: Nishanth Menon <nm@...com>
To: Bhavya Kapoor <b-kapoor@...com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: dts: ti: k3-j722s-evm: Describe main_uart5

On 11:05-20240822, Bhavya Kapoor wrote:
> main_uart5 in J722S platform is used by the firmware. Thus,
what platform? what firmware?

> describe it for completeness, adding the pinmux and mark
> it as reserved.
> 
> Signed-off-by: Bhavya Kapoor <b-kapoor@...com>
> ---
>  arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> index 24e9f2ea509b..5addf1c0afc2 100644
> --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> @@ -20,6 +20,7 @@ / {
>  	aliases {
>  		serial0 = &wkup_uart0;
>  		serial2 = &main_uart0;
> +		serial3 = &main_uart5;
>  		mmc0 = &sdhci0;
>  		mmc1 = &sdhci1;
>  	};
> @@ -211,6 +212,13 @@ J722S_IOPAD(0x01cc, PIN_OUTPUT, 0)	/* (B22) UART0_TXD */
>  		bootph-all;
>  	};
>  
> +	main_uart5_pins_default: main-uart5-default-pins {
> +		pinctrl-single,pins = <
> +			J722S_IOPAD(0x0108, PIN_INPUT, 3)       /* (J27) UART5_RXD */
> +			J722S_IOPAD(0x010c, PIN_OUTPUT, 3)      /* (H27) UART5_TXD */
> +		>;
> +	};
> +
>  	vdd_sd_dv_pins_default: vdd-sd-dv-default-pins {
>  		pinctrl-single,pins = <
>  			J722S_IOPAD(0x0120, PIN_INPUT, 7) /* (F27) MMC2_CMD.GPIO0_70 */
> @@ -330,6 +338,12 @@ &main_uart0 {
>  	bootph-all;
>  };
>  
> +&main_uart5 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_uart5_pins_default>;

Document specifically why reserved.

> +	status = "reserved";
> +};
> +
>  &mcu_pmx0 {
>  
>  	mcu_mcan0_pins_default: mcu-mcan0-default-pins {
> -- 
> 2.34.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D