linux-kernel - Re: [PATCH v4 2/3] arm64: dts: amlogic: Add A4 Reset Controller

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Message-ID: <4cec908c-1412-4e18-959d-b71c9ec21eb4@kernel.org>
Date: Mon, 17 Mar 2025 08:28:45 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kelvin Zhang <kelvin.zhang@...ogic.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Zelong Dong <zelong.dong@...ogic.com>
Subject: Re: [PATCH v4 2/3] arm64: dts: amlogic: Add A4 Reset Controller

On 17/03/2025 03:49, Kelvin Zhang wrote:
>>
>> Why do you have on the bus devices with bus addressing and without it?
>> What sort of bus is it?
> 
> Are you referring to the 'apb'?
> If so, the 'apb' bus is defined in 
> arch/arm64/boot/dts/amlogic/amlogic-a4-common.dtsi.
> 
> apb: bus@...00000 {
>          compatible = "simple-bus";
>          reg = <0x0 0xfe000000 0x0 0x480000>;
>          #address-cells = <2>;
>          #size-cells = <2>;
>          ranges = <0x0 0x0 0x0 0xfe000000 0x0 0x480000>;
> 
>>
>>>        periphs_pinctrl: pinctrl {

Then what the heck is this?

>>>                compatible = "amlogic,pinctrl-a4";
>>>                #address-cells = <2>;
>>
>> Best regards,
>> Krzysztof
>>
> 


Best regards,
Krzysztof