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Message-ID: <73a4a16b-193a-3075-61e9-82bcf21fc7d2@phytec.de>
Date:   Wed, 30 Mar 2022 15:55:45 +0200
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Subject: Re: [RFC] arm64: dts: ti: introduce a minimal am642 device tree
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To:     Bryan Brattlof <bb@ti.com>, Nishanth Menon <nm@ti.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Tero Kristo <kristo@kernel.org>
CC:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzk+dt@kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
References: <20220321155417.13267-1-bb@ti.com>
From:   Wadim Egorov <w.egorov@phytec.de>
In-Reply-To: <20220321155417.13267-1-bb@ti.com>
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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