linux-kernel - Re: [RFC] arm64: dts: ti: introduce a minimal am642 device tree

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Date:   Wed, 30 Mar 2022 15:55:45 +0200
From:   Wadim Egorov <w.egorov@...tec.de>
To:     Bryan Brattlof <bb@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] arm64: dts: ti: introduce a minimal am642 device tree

Hi Bryan,

> +/* (optional) for console */
> +&main_uart0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_uart0_pins_default>;
> +};
> +
> +/* reserved for firmware */
> +&main_uart1 {
> +	status = "reserved";
> +};

k3-image-gen says UART0 is used as a debug interface. See

 
https://git.ti.com/cgit/k3-image-gen/k3-image-gen/tree/soc/am64x/evm/board-cfg.c#n81

So it seems that you can enable uart1 here. But people may run into a 
conflict with uart0 and k3-image-gen compiled with ENABLE_TRACE=1.

If I am wrong, can you please clarify why you mark uart1 as reserved.

Regards,
Wadim