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

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Date:   Wed, 7 Jun 2023 17:52:32 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 12:36, Miquel Raynal wrote:
> Hi Arseniy,
> 
> avkrasnov@...rdevices.ru wrote on Wed, 7 Jun 2023 12:04:29 +0300:
> 
>> On 07.06.2023 12:08, Krzysztof Kozlowski wrote:
>>> On 07/06/2023 10:57, Arseniy Krasnov wrote:  
>>>>
>>>>
>>>> On 07.06.2023 11:53, Krzysztof Kozlowski wrote:  
>>>>> 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)?  
> 
> The bindings and your driver internal representation are two different
> things. Anyway, as mentioned above, wiring the RB line to one die and
> not the other would be valid hardware design and would require the rb
> property to be in the chip node. Please perform a per-chip property read
> in the driver as well.

Done, I resend both patches (bindings + driver update) as a single patchset. Your review comments
for driver code were also fixed.

> 
>>>>>
>>>>> No, because how would your DTS pass validation? I understand you did not
>>>>> test the bindings, but this will improve, right?  
>>>>
>>>> Ok, i'll follow DTS layout in the driver, "test the bindings" You mean "make dt_binding_check"?  
>>>
>>> Yes. They were sent without testing.
>>>
>>> But please also test your DTS with dtbs_check. 

Done

Thanks, Arseniy

>>
>> Got it!
>>
>> Thanks, Arseniy
>>
>>>
>>>
>>> Best regards,
>>> Krzysztof
>>>   
> 
> 
> Thanks,
> Miquèl