linux-kernel - Re: [PATCH 04/14] dt-bindings: dma: add Canaan k210 to Synopsys DesignWare DMA

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Message-ID: <40d76866-34e3-baef-c3fe-8836cd2430f6@microchip.com>
Date:   Tue, 28 Jun 2022 06:30:40 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <robh@...nel.org>, <mail@...chuod.ie>
CC:     <airlied@...ux.ie>, <daniel@...ll.ch>,
        <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>,
        <fancer.lancer@...il.com>, <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>, <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 04/14] dt-bindings: dma: add Canaan k210 to Synopsys
 DesignWare DMA

On 28/06/2022 00:29, Rob Herring wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Sat, Jun 18, 2022 at 01:30:26PM +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. Add a custom compatible that
>> supports the 6 interrupt configuration which falls back to the standard
>> binding which is currently the one in use in the devicetree entry.
> 
> But it works with only 1 interrupt?

Seemingly...

> 
>>
>> Link: https://canaan-creative.com/wp-content/uploads/2020/03/kendryte_standalone_programming_guide_20190311144158_en.pdf #Page 58
>> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
>> ---
>>   .../bindings/dma/snps,dw-axi-dmac.yaml        | 35 ++++++++++++++-----
>>   1 file changed, 26 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> index 4324a94b26b2..bc85598151ef 100644
>> --- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>> @@ -18,9 +18,13 @@ allOf:
>>
>>   properties:
>>     compatible:
>> -    enum:
>> -      - snps,axi-dma-1.01a
>> -      - intel,kmb-axi-dma
>> +    oneOf:
>> +      - items:
>> +          - const: canaan,k210-axi-dma
>> +          - const: snps,axi-dma-1.01a
> 
> I would drop this depending on your need for compatibility. Are you sure
> on the IP version? It's not really compatible if the number of
> interrupts is different.

That's what it has been using until now. Am I sure? No.
Do I have docs to go check against? Unfortunately, also no.
Does it not qualify as a fallback compatible if it supports
a subset of what the hardware does?

> 
>> +      - enum:
>> +          - snps,axi-dma-1.01a
>> +          - intel,kmb-axi-dma
>>
>>     reg:
>>       minItems: 1
>> @@ -33,9 +37,6 @@ properties:
>>         - const: axidma_ctrl_regs
>>         - const: axidma_apb_regs
>>
>> -  interrupts:
>> -    maxItems: 1
>> -
>>     clocks:
>>       items:
>>         - description: Bus Clock
>> @@ -92,6 +93,22 @@ properties:
>>       minimum: 1
>>       maximum: 256
>>
>> +if:
>> +  properties:
>> +    compatible:
>> +      contains:
>> +        const: canaan,k210-axi-dma
>> +
>> +then:
>> +  properties:
>> +    interrupts:
>> +      maxItems: 6
>> +
>> +else:
>> +  properties:
>> +    interrupts:
>> +      maxItems: 1
>> +
>>   required:
>>     - compatible
>>     - reg
>> @@ -105,7 +122,7 @@ required:
>>     - snps,priority
>>     - snps,block-size
>>
>> -additionalProperties: false
>> +unevaluatedProperties: false
>>
>>   examples:
>>     - |
>> @@ -113,12 +130,12 @@ examples:
>>        #include <dt-bindings/interrupt-controller/irq.h>
>>        /* example with snps,dw-axi-dmac */
>>        dmac: dma-controller@...00 {
>> -         compatible = "snps,axi-dma-1.01a";
>> +         compatible = "canaan,k210-axi-dma", "snps,axi-dma-1.01a";
>>            reg = <0x80000 0x400>;
>>            clocks = <&core_clk>, <&cfgr_clk>;
>>            clock-names = "core-clk", "cfgr-clk";
>>            interrupt-parent = <&intc>;
>> -         interrupts = <27>;
>> +         interrupts = <27>, <28>, <29>, <30>, <31>, <32>;
> 
> Does the example really need changing? The old one was correct, right?

:facepalm:, committed my dt_binding_check test
Thanks Rob,
Conor.

> 
>>            #dma-cells = <1>;
>>            dma-channels = <4>;
>>            snps,dma-masters = <2>;
>> --
>> 2.36.1
>>
>>