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, 27 Jun 2022 18:05:40 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <robh@...nel.org>
CC:     <mail@...chuod.ie>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <krzysztof.kozlowski+dt@...aro.org>, <thierry.reding@...il.com>,
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        <fancer.lancer@...il.com>, <vkoul@...nel.org>,
        <lgirdwood@...il.com>, <broonie@...nel.org>,
        <daniel.lezcano@...aro.org>, <palmer@...belt.com>,
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        <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 27/06/2022 18:15, Rob Herring wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Mon, Jun 20, 2022 at 09:06:34PM +0000, Conor.Dooley@...rochip.com wrote:
>> On 20/06/2022 21:56, Serge Semin wrote:
>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>>
>>> On Sat, Jun 18, 2022 at 01:30:28PM +0100, Conor Dooley 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>
>>>> ---
>>>>  .../bindings/spi/snps,dw-apb-ssi.yaml         | 48 ++++++++++++++-----
>>>>  1 file changed, 35 insertions(+), 13 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
>>>> index e25d44c218f2..f2b9e3f062cd 100644
>>>> --- 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
>>>> +
>>>> +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
>>>
>>> You can just use a more relaxed constraint "enum: [1 2 4 8]" here
>>
>> 8 too? sure.
> 
> Then no constraints needed because the common definition already has
> this presumably.

Almost, the default has 0 in the enum too.
I'll go with that - thanks!
Conor.