linux-kernel - Re: [PATCH v3 05/15] dt-bindings: dma: dw-axi-dmac: extend the number of interrupts

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Date:   Thu, 30 Jun 2022 23:12:53 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <fancer.lancer@...il.com>, <mail@...chuod.ie>
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>, <damien.lemoal@...nsource.wdc.com>,
        <geert@...ux-m68k.org>, <niklas.cassel@....com>,
        <dillon.minfei@...il.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 v3 05/15] dt-bindings: dma: dw-axi-dmac: extend the number
 of interrupts

On 30/06/2022 22:55, Serge Semin wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Wed, Jun 29, 2022 at 07:43:34PM +0100, Conor Dooley wrote:
>> From: Conor Dooley <conor.dooley@...rochip.com>
>>
>> The Canaan k210 apparently has a Sysnopsys Designware AXI DMA
>> controller, but according to the documentation & devicetree it has 6
>> interrupts rather than the standard one. Support the 6 interrupt
>> configuration by unconditionally extending the binding to a maximum of
>> 8 per-channel interrupts thereby matching the number of possible
>> channels.
>>
>> Link: https://canaan-creative.com/wp-content/uploads/2020/03/kendryte_standalone_programming_guide_20190311144158_en.pdf #Page 51
>> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
>> ---
>>  Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> index 4324a94b26b2..e33ef22aec9c 100644
>> --- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> @@ -34,7 +34,9 @@ properties:
>>        - const: axidma_apb_regs
>>
>>    interrupts:
> 
>> -    maxItems: 1
>> +    description: per channel interrupts
> 
> Description is inaccurate. It's either combined or per-channel IRQs.

I will change it to:
  interrupts:
    description: |
      If the IP-core synthesis parameter DMAX_INTR_IO_TYPE is set to 1, this
      will be per-channel interrupts. Otherwise, this is a single combined IRQ
      for all channels.
    minItems: 1
    maxItems: 8

How's that sound?


> 
> Other than that:
> Reviewed-by: Serge Semin <fancer.lancer@...il.com>
> 
> -Sergey
> 
>> +    minItems: 1
>> +    maxItems: 8
>>
>>    clocks:
>>      items:
>> --
>> 2.36.1
>>