linux-kernel - Re: [PATCH 06/14] spi: dt-bindings: dw-apb-ssi: update spi-{r,t}x-bus-width for dwc-ssi

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Date:   Mon, 20 Jun 2022 08:47:03 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <geert@...ux-m68k.org>
CC:     <airlied@...ux.ie>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <thierry.reding@...il.com>,
        <sam@...nborg.org>, <Eugeniy.Paltsev@...opsys.com>,
        <vkoul@...nel.org>, <lgirdwood@...il.com>, <broonie@...nel.org>,
        <fancer.lancer@...il.com>, <daniel.lezcano@...aro.org>,
        <palmer@...belt.com>, <palmer@...osinc.com>, <tglx@...utronix.de>,
        <paul.walmsley@...ive.com>, <aou@...s.berkeley.edu>,
        <Conor.Dooley@...rochip.com>, <masahiroy@...nel.org>,
        <damien.lemoal@...nsource.wdc.com>, <niklas.cassel@....com>,
        <dillon.minfei@...il.com>, <jee.heng.sia@...el.com>,
        <joabreu@...opsys.com>, <dri-devel@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dmaengine@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <linux-spi@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 06/14] spi: dt-bindings: dw-apb-ssi: update
 spi-{r,t}x-bus-width for dwc-ssi

On 20/06/2022 09:02, Geert Uytterhoeven wrote:
> Hi Conor,
> 
> On Sat, Jun 18, 2022 at 2:32 PM Conor Dooley <mail@...chuod.ie> wrote:
>> From: Conor Dooley <conor.dooley@...rochip.com>
>>
>> snps,dwc-ssi-1.01a has a single user - the Canaan k210, which uses a
>> width of 4 for spi-{r,t}x-bus-width. Update the binding to reflect
>> this.
>>
>> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> 
> Thanks for your patch!
> 
>> --- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
>> +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
>> @@ -135,19 +135,41 @@ properties:
>>         of the designware controller, and the upper limit is also subject to
>>         controller configuration.
>>
>> -patternProperties:
>> -  "^.*@[0-9a-f]+$":
>> -    type: object
>> -    properties:
>> -      reg:
>> -        minimum: 0
>> -        maximum: 3
>> -
>> -      spi-rx-bus-width:
>> -        const: 1
>> -
>> -      spi-tx-bus-width:
>> -        const: 1
>> +if:
>> +  properties:
>> +    compatible:
>> +      contains:
>> +        const: snps,dwc-ssi-1.01a
>> +
>> +then:
>> +  patternProperties:
>> +    "^.*@[0-9a-f]+$":
>> +      type: object
>> +      properties:
>> +        reg:
>> +          minimum: 0
>> +          maximum: 3
>> +
>> +        spi-rx-bus-width:
>> +          const: 4
>> +
>> +        spi-tx-bus-width:
>> +          const: 4
> 
> These two also depend on the board (SPI device + wiring).
> So all of [1, 2, 4] are valid values.

Yeah, I wasn't sure about this one as I was writing it.
enum: [1, 2, 4] I guess.
As always, thanks Geert!

Conor.

> 
>> +
>> +else:
>> +  patternProperties:
>> +    "^.*@[0-9a-f]+$":
>> +      type: object
>> +      properties:
>> +        reg:
>> +          minimum: 0
>> +          maximum: 3
>> +
>> +        spi-rx-bus-width:
>> +          const: 1
>> +
>> +        spi-tx-bus-width:
>> +          const: 1
>>
>>   unevaluatedProperties: false
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds