linux-kernel - Re: [PATCH 2/2] arm64: dts: ti: k3-am62l: add initial reference board file

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Message-ID: <c8834352-75a7-446e-95eb-809aaa5cb18b@ti.com>
Date: Mon, 18 Nov 2024 12:09:46 -0600
From: Andrew Davis <afd@...com>
To: Bryan Brattlof <bb@...com>, Nishanth Menon <nm@...com>,
        Vignesh
 Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: ti: k3-am62l: add initial reference board
 file

On 11/17/24 11:34 PM, Bryan Brattlof wrote:
> From: Vignesh Raghavendra <vigneshr@...com>
> 
> Add the initial board file for the AM62L3's Evaluation Module.
> 
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> Signed-off-by: Bryan Brattlof <bb@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-am62l3-evm.dts | 54 ++++++++++++++++++++++++++++++++
>   1 file changed, 54 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
> new file mode 100644
> index 0000000000000..2d59389765cab
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ti/k3-am62l3-evm.dts
> @@ -0,0 +1,54 @@
> +// SPDX-License-Identifier: GPL-2.0-only or MIT
> +/*
> + * Device Tree file for the AM62L3 Evaluation Module
> + * Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com/
> + *
> + * Technical Reference Manual: https://www.ti.com/lit/ug/sprujb4/sprujb4.pdf
> + */
> +
> +/dts-v1/;
> +
> +#include "k3-am62l3.dtsi"
> +
> +/ {
> +	compatible = "ti,am62l3-evm", "ti,am62l3";
> +	model = "Texas Instruments AM62L3 Evaluation Module";
> +
> +	aliases {
> +		serial2 = &main_uart0;

We usually have WKUP and MCU UARTs as serial0 and serial1, we don't
have that many, so we would never have serial1, only 0 and 2. Might
be time we drop this odd numbering convention, at least for AM62L
class parts..

> +	};
> +
> +	chosen {
> +		stdout-path = &main_uart0;
> +	};
> +
> +	memory@...00000 {
> +		reg = <0x00000000 0x80000000 0x00000000 0x80000000>;
> +		device_type = "memory";
> +		bootph-all;
> +	};
> +
> +	reserved-memory {

Not needed until you have something to reserve.

> +		ranges;
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +	};
> +};
> +
> +&pmx0 {
> +	main_uart0_pins_default: main_uart0-default-pins {
> +		pinctrl-single,pins = <
> +			AM62LX_IOPAD(0x01d4, PIN_INPUT, 1)	  /* (D7)  UART0_RXD */
> +			AM62LX_IOPAD(0x01d8, PIN_OUTPUT, 1)	  /* (A6)  UART0_TXD */
> +		>;
> +		bootph-all;
> +	};
> +};
> +
> +&main_uart0 {
> +	current-speed = <115200>;

current-speed is only for UARTs that can't detect their current speed,
our UART and driver can, so this line isn't needed.

Andrew

> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_uart0_pins_default>;
> +	status = "okay";
> +	bootph-all;
> +};
>