linux-kernel - Re: [PATCH 3/4] dt-bindings: spi: Add the DMA properties for the SPI dma mode

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Date:   Mon, 21 Jan 2019 07:52:57 -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 3/4] dt-bindings: spi: Add the DMA properties for the SPI
 dma mode

On Tue, Jan 15, 2019 at 7:47 AM Baolin Wang <baolin.wang@...aro.org> wrote:
>
> From: Lanqing Liu <lanqing.liu@...eadtrum.com>

The email address should be updated with unisoc.com.

> Add the DMA properties for the SPI dma mode.
>
> Signed-off-by: Lanqing Liu <lanqing.liu@...eadtrum.com>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
>  Documentation/devicetree/bindings/spi/spi-sprd.txt |    9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/spi/spi-sprd.txt b/Documentation/devicetree/bindings/spi/spi-sprd.txt
> index bad211a..01ef53f 100644
> --- a/Documentation/devicetree/bindings/spi/spi-sprd.txt
> +++ b/Documentation/devicetree/bindings/spi/spi-sprd.txt
> @@ -14,6 +14,12 @@ 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 which the SPI used sorted in the
> +       same order as the dma-names property.
> +sprd,dma-slave-ids: Should contain the DMA number that the SPI hardware required.
> +
>  Example:
>  spi0: spi@...00000{
>         compatible = "sprd,sc9860-spi";
> @@ -21,6 +27,9 @@ 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";
> +       dmas = <&apdma 11>, <&apdma 12>;
> +       sprd,dma-slave-ids = <11 12>;

When would this be different values from what's in 'dmas'?

>         #address-cells = <1>;
>         #size-cells = <0>;
>  };
> --
> 1.7.9.5
>