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

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Date:   Thu, 31 Mar 2022 09:19:54 +0200
From:   Wadim Egorov <w.egorov@...tec.de>
To:     Vignesh Raghavendra <vigneshr@...com>, Bryan Brattlof <bb@...com>,
        Nishanth Menon <nm@...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



Am 31.03.22 um 08:58 schrieb Vignesh Raghavendra:
> Hi Wadim,
> 
> On 30/03/22 7:25 pm, Wadim Egorov wrote:
>> 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.
>>
> 
> We just seem to have same macro shared across multiple SoCs,
> BOARDCFG_TRACE_DST_UART0 means logs are also directed to UART. Instance
> of UART used for logging is platform specific.
> 
> On AM64 SYSFW logs are directed to MAIN UART1 (MAIN UART0 is used for
> linux console). I will work internally and get SYSFW documentation
> updated to reflect the same. Thanks!

OK, thank you for the clarification.

> 
> Regards
> Vignesh