linux-kernel - Re: [PATCH v1 1/3] dt-bindings: dma: snps,dw-axi-dmac: Update resets and add snps,num-hs-if

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Message-ID: <9f8c3242-762c-96a3-ad5b-e71e2321e7bf@starfivetech.com>
Date:   Mon, 13 Feb 2023 18:08:40 +0800
From:   Walker Chen <walker.chen@...rfivetech.com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-riscv@...ts.infradead.org>, <dmaengine@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor@...nel.org>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] dt-bindings: dma: snps,dw-axi-dmac: Update resets
 and add snps,num-hs-if

On 2023/2/8 4:58, Rob Herring wrote:
> On Mon, Feb 06, 2023 at 07:38:09PM +0800, Walker Chen wrote:
>> Add two reset items and properties 'snps,num-hs-if'.
>> The DMA controller needs to be reset before being used in JH7110 SoC.
>> Another difference from the original version is that the hardware
>> handshake number of DMA can be up to 56 while the number in original
>> version is less than 16, and different registers are selected according
>> to this.
>> 
>> Signed-off-by: Walker Chen <walker.chen@...rfivetech.com>
>> ---
>>  .../bindings/dma/snps,dw-axi-dmac.yaml          | 17 ++++++++++++++++-
>>  1 file changed, 16 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 67aa7bb6d36a..1a8d8c20e254 100644
>> --- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> @@ -9,6 +9,7 @@ title: Synopsys DesignWare AXI DMA Controller
>>  maintainers:
>>    - Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
>>    - Jee Heng Sia <jee.heng.sia@...el.com>
>> +  - Walker Chen <walker.chen@...rfivetech.com>
>>  
>>  description:
>>    Synopsys DesignWare AXI DMA Controller DT Binding
>> @@ -21,6 +22,7 @@ properties:
>>      enum:
>>        - snps,axi-dma-1.01a
>>        - intel,kmb-axi-dma
>> +      - starfive,axi-dma
> 
> This should be SoC specific.

Well, so this should be 'starfive,jh7110-axi-dma'.

> 
>>  
>>    reg:
>>      minItems: 1
>> @@ -59,7 +61,12 @@ properties:
>>      maximum: 8
>>  
>>    resets:
>> -    maxItems: 1
>> +    maxItems: 2
>> +
>> +  reset-names:
>> +    items:
>> +      - const: axi-rst
>> +      - const: ahb-rst
> 
> '-rst' is redundant.

Okay, will be drop '-rst' in next version.

> 
>>  
>>    snps,dma-masters:
>>      description: |
>> @@ -74,6 +81,14 @@ properties:
>>      $ref: /schemas/types.yaml#/definitions/uint32
>>      enum: [0, 1, 2, 3, 4, 5, 6]
>>  
>> +  snps,num-hs-if:
>> +    description: |
>> +      The number of hardware handshake. If it is more than 16,
>> +      CHx_CFG2 is used to configure the DMA transfer instead of CHx_CFG.
> 
> Can't you infer this from the compatible string?

Yeah, maybe this is also feasible from the compatible string.
Thanks.

Best regards,
Walker