linux-kernel - Re: [PATCH 6/9] arm64: dts: ti: k3-j721e-beagleboneai64: Add wakeup

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Date:   Tue, 13 Jun 2023 19:26:34 +0530
From:   "Kumar, Udit" <u-kumar1@...com>
To:     Nishanth Menon <nm@...com>, Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tero Kristo <kristo@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Neha Malcom Francis <n-francis@...com>
Subject: Re: [PATCH 6/9] arm64: dts: ti: k3-j721e-beagleboneai64: Add
 wakeup_uart pinmux

Hi Nishanth,

On 6/2/2023 12:01 AM, Nishanth Menon wrote:
> Define the wakeup uart pin-mux for completeness. This allows the
> device tree usage in bootloader and firmwares that can configure the
> same appropriately.
>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts b/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts
> index c13246a9ed8f..bc53ca566a68 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts
> @@ -531,6 +531,13 @@ J721E_WKUP_IOPAD(0xfc, PIN_INPUT_PULLUP, 0) /* (H24) WKUP_I2C0_SDA */
>   		>;
>   	};
>   
> +	wkup_uart0_pins_default: wkup-uart0-pins-default {
> +		pinctrl-single,pins = <
> +			J721E_WKUP_IOPAD(0xa0, PIN_INPUT, 0) /* (J29) WKUP_UART0_RXD */
> +			J721E_WKUP_IOPAD(0xa4, PIN_OUTPUT, 0) /* (J28) WKUP_UART0_TXD */
> +		>;
> +	};
> +
>   	mcu_usbss1_pins_default: mcu-usbss1-pins-default {
>   		pinctrl-single,pins = <
>   			J721E_WKUP_IOPAD(0x3c, PIN_OUTPUT_PULLUP, 5) /* (A23) MCU_OSPI1_LBCLKO.WKUP_GPIO0_30 */
> @@ -541,6 +548,8 @@ J721E_WKUP_IOPAD(0x3c, PIN_OUTPUT_PULLUP, 5) /* (A23) MCU_OSPI1_LBCLKO.WKUP_GPIO
>   &wkup_uart0 {
>   	/* Wakeup UART is used by TIFS firmware. */
>   	status = "reserved";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&wkup_uart0_pins_default>;
>   };


If you like to consider alias for wkup_uart0 for this board ,

Just to align with other boards for this SOC family.  I understand 
wkup_uart0 is not being used.


>   
>   &main_uart0 {