linux-kernel - Re: [DMARC error][DKIM error] [PATCH 3/4] arm64: dts: add support for A4 based Amlogic BA400

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Message-ID: <b1d59c5e-26ae-45a8-8677-13d2bb5e9751@amlogic.com>
Date: Fri, 15 Mar 2024 11:13:16 +0800
From: Xianwei Zhao <xianwei.zhao@...ogic.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Dmitry Rokosov <ddrokosov@...utedevices.com>,
 Xianwei Zhao via B4 Relay <devnull+xianwei.zhao.amlogic.com@...nel.org>
Cc: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Jerome Brunet <jbrunet@...libre.com>, Kevin Hilman <khilman@...libre.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org
Subject: Re: [DMARC error][DKIM error] [PATCH 3/4] arm64: dts: add support for
 A4 based Amlogic BA400

Hi Krzysztof,
      Thanks for your reply.

On 2024/3/14 14:58, Krzysztof Kozlowski wrote:
> [ EXTERNAL EMAIL ]
> 
> On 14/03/2024 06:19, Xianwei Zhao wrote:
>>>> +
>>>> +             apb@...00000 {
>>>> +                     compatible = "simple-bus";
>>>> +                     reg = <0x0 0xfe000000 0x0 0x480000>;
>>>> +                     #address-cells = <2>;
>>>> +                     #size-cells = <2>;
>>>> +                     ranges = <0x0 0x0 0x0 0xfe000000 0x0 0x480000>;
>>>> +
>>>> +                     uart_b: serial@...00 {
>>>> +                             compatible = "amlogic,meson-s4-uart",
>>>
>>> If I'm not wrong, you need to create dt-binding alias for meson-a4-uart
>>> and use it as 3rd compatible string.
>>>
>> On UART module, A4 and A5 SoCs exactly the same as S4. There's no
>> difference.
> 
> That's not really the point. You are supposed to always provide SoC
> specific compatible in front of the fallback. See writing bindings document.
> 
Will add bindings.
If two chips use a common dtsi, and this module is in the common dtsi, 
can I only add one to suit this two chips?
> 
> Best regards,
> Krzysztof
>