linux-kernel - Re: [PATCH v2 2/3] dt-bindings: spi: Add the DMA properties for the SPI dma mode

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Message-ID: <CAL_JsqK+x+XgxSn7ks84_JZxTkpQ-irFBmRc3tp3zsfUcHUPpg@mail.gmail.com>
Date:   Mon, 18 Feb 2019 08:02:06 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Orson Zhai <orsonzhai@...il.com>,
        Lyra Zhang <zhang.lyra@...il.com>, lanqing.liu@...soc.com,
        linux-spi <linux-spi@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] dt-bindings: spi: Add the DMA properties for the
 SPI dma mode

On Wed, Feb 13, 2019 at 1:37 AM Baolin Wang <baolin.wang@...aro.org> wrote:
>
> From: Lanqing Liu <lanqing.liu@...soc.com>
>
> Add the DMA properties for the SPI dma mode.
>
> Signed-off-by: Lanqing Liu <lanqing.liu@...soc.com>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes from v1:
>  - Remove sprd,dma-slave-ids property.
> ---
>  Documentation/devicetree/bindings/spi/spi-sprd.txt |    7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/spi/spi-sprd.txt b/Documentation/devicetree/bindings/spi/spi-sprd.txt
> index bad211a..3c7eacc 100644
> --- a/Documentation/devicetree/bindings/spi/spi-sprd.txt
> +++ b/Documentation/devicetree/bindings/spi/spi-sprd.txt
> @@ -14,6 +14,11 @@ Required properties:
>         address on the SPI bus. Should be set to 1.
>  - #size-cells: Should be set to 0.
>
> +Optional properties:
> +dma-names: Should contain names of the SPI used DMA channel.
> +dmas: Should contain DMA channels and DMA slave ids which the SPI used
> +       sorted in the same order as the dma-names property.

These need to define the order and names.

> +
>  Example:
>  spi0: spi@...00000{
>         compatible = "sprd,sc9860-spi";
> @@ -21,6 +26,8 @@ spi0: spi@...00000{
>         interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
>         clock-names = "spi", "source","enable";
>         clocks = <&clk_spi0>, <&ext_26m>, <&clk_ap_apb_gates 5>;
> +       dma-names = "rx_chn", "tx_chn";

Everyone else uses "rx" and "tx". Do you really need something different?

> +       dmas = <&apdma 11 11>, <&apdma 12 12>;
>         #address-cells = <1>;
>         #size-cells = <0>;
>  };
> --
> 1.7.9.5
>