linux-kernel - Re: [PATCH v2 1/9] dt-bindings: spi: Add spi-buses property

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Message-ID: <0a3b69b8-e868-49c8-a0ca-c448ee3cd488@linux.dev>
Date: Mon, 18 Aug 2025 10:56:50 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: David Lechner <dlechner@...libre.com>, Mark Brown <broonie@...nel.org>,
 Michal Simek <michal.simek@....com>, linux-spi@...r.kernel.org
Cc: Jinjie Ruan <ruanjinjie@...wei.com>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
Subject: Re: [PATCH v2 1/9] dt-bindings: spi: Add spi-buses property

On 8/15/25 11:49, David Lechner wrote:
> On 6/16/25 5:00 PM, Sean Anderson wrote:
>> From: David Lechner <dlechner@...libre.com>
>> 
>> Add a spi-buses property to the spi-peripheral-props binding to allow
>> specifying the SPI bus or buses that a peripheral is connected to in
>> cases where the SPI controller has more than one physical SPI bus.
>> 
>> Signed-off-by: David Lechner <dlechner@...libre.com>
>> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
>> ---
>> 
>> Changes in v2:
>> - New
>> 
>>  .../devicetree/bindings/spi/spi-peripheral-props.yaml  | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
>> index 8fc17e16efb2..cfdb55071a08 100644
>> --- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
>> +++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
>> @@ -89,6 +89,16 @@ properties:
>>      description:
>>        Delay, in microseconds, after a write transfer.
>>  
>> +  spi-buses:
>> +    description:
>> +      Array of bus numbers that describes which SPI buses of the controller are
>> +      connected to the peripheral. This only applies to peripherals connected
>> +      to specialized SPI controllers that have multiple SPI buses on a single
>> +      controller.
>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>> +    minItems: 1
> 
> Finally have some hardware to test this series with using 2 or 4 buses.
> I found that we also need an absolute max here to make the bindings checker
> happy. 8 seems sensible since I haven't seen more than that on a peripheral.
> We can always increase it if we find hardware that requires more buses.
> 
> 	maxItems: 8

What is the error you get without this?

--Sean