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

Walker Chen
2023-02-13T10:09:53Z

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@starfivetech.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@synopsys.com>
>> - Jee Heng Sia <jee.heng.sia@intel.com>
>> + - Walker Chen <walker.chen@starfivetech.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