linux-kernel - Re: [PATCH v1] dt-bindings: nand: meson: Fix 'nand-rb' property

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Date:   Wed, 7 Jun 2023 10:53:59 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Arseniy Krasnov <avkrasnov@...rdevices.ru>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Liang Yang <liang.yang@...ogic.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        oxffffaa@...il.com, kernel@...rdevices.ru,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] dt-bindings: nand: meson: Fix 'nand-rb' property

On 07/06/2023 10:40, Arseniy Krasnov wrote:
> Hello Miquel, 
> 
> On 07.06.2023 10:58, Miquel Raynal wrote:
> 
>> Hi Arseniy,
>>
>> AVKrasnov@...rdevices.ru wrote on Tue, 6 Jun 2023 22:35:07 +0300:
>>
>>> Add description of 'nand-rb' property. Use "Fixes" because this property
>>> must be supported since the beginning. For this controller 'nand-rb' is
>>> stored in the controller node (not in chip), because it has only single
>>> r/b wire for all chips.
>>
>> Sorry if I mislead you in the first place, but you could definitely
>> have two chips and only one with RB wired. It needs to be defined in
>> the chips.
> 
> Ok, so to clarify: is it ok, that in bindings this property will be placed in the
> chip, but in driver, i'm trying to read it from the controller node (thus  in
> dts file it will be also in controller node)?

No, because how would your DTS pass validation? I understand you did not
test the bindings, but this will improve, right?

> Because in driver there is no sense
> to store this value in chip structure. 

Driver does not shape the DTS. Hardware does.



Best regards,
Krzysztof