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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Message-ID: <c272728f-f610-77df-bd9b-c9fee6b727f8@opensource.wdc.com>
Date:   Tue, 21 Jun 2022 08:17:20 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Conor Dooley <mail@...chuod.ie>, Conor.Dooley@...rochip.com,
        fancer.lancer@...il.com
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, daniel.lezcano@...aro.org,
        palmer@...belt.com, palmer@...osinc.com, tglx@...utronix.de,
        paul.walmsley@...ive.com, aou@...s.berkeley.edu,
        masahiroy@...nel.org, geert@...ux-m68k.org, 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 6/21/22 07:49, Conor Dooley wrote:
> 
> 
> On 20/06/2022 23:46, Damien Le Moal wrote:
>> On 6/21/22 06:06, 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.
>>>
>>>> irrespective from the compatible string. The modern DW APB SSI
>>>> controllers of v.4.* and newer also support the enhanced SPI Modes too
>>>> (Dual, Quad and Octal). Since the IP-core version is auto-detected at
>>>> run-time there is no way to create a DT-schema correctly constraining
>>>> the Rx/Tx SPI bus widths. So let's keep the
>>>> compatible-string-independent "patternProperties" here but just extend
>>>> the set of acceptable "spi-rx-bus-width" and "spi-tx-bus-width"
>>>> properties values.
>>>
>>> SGTM!
>>>
>>>>
>>>> Note the DW APB SSI/AHB SSI driver currently doesn't support the
>>>> enhanced SPI modes. So I am not sure whether the multi-lines Rx/Tx SPI
>>>> bus indeed works for Canaan K210 AHB SSI controller. AFAICS from the
>>>> DW APB SSI v4.01a manual the Enhanced SPI mode needs to be properly
>>>> activated by means of the corresponding CSR. So most likely the DW AHB
>>>> SSI controllers need some specific setups too.
>>>
>>> hmm, well I'll leave that up to people that have Canaan hardware!
>>
>> I will test this series.
>>
> 
> Cool, thanks.
> I'll try to get a respin out tomorrow w/ the memory node "unfixed".

OK. I will test that then :)

> Conor.
> 
>>> Thanks,
>>> Conor.
>>>
>>>>
>>>> -Sergey
>>>>
>>>>>
>>>>>  unevaluatedProperties: false
>>>>>
>>>>> --
>>>>> 2.36.1
>>>>>
>>>
>>
>>


-- 
Damien Le Moal
Western Digital Research