linux-kernel - Re: [PATCH 1/3] dt-bindings: auxdisplay: hit,hd44780: drop redundant GPIO node

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Date: Mon, 12 Feb 2024 14:56:43 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Miguel Ojeda
 <ojeda@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Robin van der Gracht
 <robin@...tonic.nl>, Paul Burton <paulburton@...nel.org>,
 Geert Uytterhoeven <geert@...ux-m68k.org>,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: auxdisplay: hit,hd44780: drop redundant
 GPIO node

On 12/02/2024 14:39, Andy Shevchenko wrote:
> On Mon, Feb 12, 2024 at 09:34:24AM +0100, Krzysztof Kozlowski wrote:
>> Examples of other nodes, like GPIO controller, are redundant and not
>> really needed in device bindings.
> 
> ...
> 
>> -    i2c {
>> -            #address-cells = <1>;
>> -            #size-cells = <0>;
>>  
>> -            pcf8574: pcf8574@27 {
>> -                    compatible = "nxp,pcf8574";
>> -                    reg = <0x27>;
>> -                    gpio-controller;
>> -                    #gpio-cells = <2>;
>> -            };
>> -    };
> 
> In patch 3 you updated the lines that have lost their sense due to this one.

How did they lose it?


> And I agree with others, please leave this example in place.

What for? Why this binding is special and 99% of others do not need GPIO
expander in the example?

Best regards,
Krzysztof