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

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Message-ID: <166bdc27-f77c-9076-f866-180cfa5bff76@sberdevices.ru>
Date:   Wed, 7 Jun 2023 11:40:59 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     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

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)? Because in driver there is no sense
to store this value in chip structure. In fact, in driver, I can read it from the
chip node, but set 'no_rb_pin' flag in the controller structure.

Thanks, Arseniy

> 
> Please keep the bindings and driver changes related to this in the same
> series.

Ack

> 
>>
>> Fixes: fbc00b5e746f ("dt-bindings: nand: meson: convert txt to yaml")
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>> ---
>>  Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
>> index 28fb9a7dd70f..866edf800b81 100644
>> --- a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
>> +++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
>> @@ -37,6 +37,8 @@ properties:
>>        - const: core
>>        - const: device
>>  
>> +  nand-rb: true
>> +
>>  patternProperties:
>>    "^nand@[0-7]$":
>>      type: object
>> @@ -81,6 +83,7 @@ examples:
>>  
>>        pinctrl-0 = <&nand_pins>;
>>        pinctrl-names = "default";
>> +      nand-rb = "true";
>>  
>>        #address-cells = <1>;
>>        #size-cells = <0>;
> 
> 
> Thanks,
> Miquèl