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

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Message-ID: <20220627232919.GA3158390-robh@kernel.org>
Date:   Mon, 27 Jun 2022 17:29:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Conor Dooley <mail@...chuod.ie>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Niklas Cassel <niklas.cassel@....com>,
        Dillon Min <dillon.minfei@...il.com>,
        Heng Sia <jee.heng.sia@...el.com>,
        Jose Abreu <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 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?

> 
> 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.

> +      - 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?

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