linux-kernel - Re: [linux-sunxi] [PATCH v9 1/2] Documentation: dt: Add Allwinner A31 DMA controller bindings

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Message-ID: <CAGb2v67ekvfjx+nFNGfVkWYH1XeeHq4+jPGsVZBzCQNPH9Eddg@mail.gmail.com>
Date:	Wed, 28 May 2014 23:14:29 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	linux-sunxi <linux-sunxi@...glegroups.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	dmaengine@...r.kernel.org, kevin.z.m.zh@...il.com,
	sunny@...winnertech.com, Shuge <shuge@...winnertech.com>,
	zhuzhenhua@...winnertech.com, Arnd Bergmann <arnd@...db.de>,
	andriy.shevchenko@...el.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [linux-sunxi] [PATCH v9 1/2] Documentation: dt: Add Allwinner A31
 DMA controller bindings

On Thu, May 22, 2014 at 8:34 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> The Allwinner A31 DMA controller is rather simple to describe in the DT. Add
> the bindings documentation.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>  .../devicetree/bindings/dma/sun6i-dma.txt          | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/sun6i-dma.txt
>
> diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> new file mode 100644
> index 000000000000..5d7c86d52665
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> @@ -0,0 +1,45 @@
> +Allwinner A31 DMA Controller
> +
> +This driver follows the generic DMA bindings defined in dma.txt.
> +
> +Required properties:
> +
> +- compatible:  Must be "allwinner,sun6i-a31-dma"
> +- reg:         Should contain the registers base address and length
> +- interrupts:  Should contain a reference to the interrupt used by this device
> +- clocks:      Should contain a reference to the parent AHB clock
> +- resets:      Should contain a reference to the reset controller asserting
> +               this device in reset

Extra spaces between the leading tabs.
(Gmail messes up whitespaces, please see original mail.)

> +- #dma-cells : Should be 1, a single cell holding a line request number
> +
> +Example:
> +       dma: dma-controller@...02000 {
> +               compatible = "allwinner,sun6i-a31-dma";
> +               reg = <0x01c02000 0x1000>;
> +               interrupts = <0 50 4>;
> +               clocks = <&ahb1_gates 6>;
> +               resets = <&ahb1_rst 6>;
> +               #dma-cells = <1>;
> +       };
> +
> +Clients:
> +
> +DMA clients connected to the A31 DMA controller must use the format
> +described in the dma.txt file, using a two-cell specifier for each
> +channel: a phandle plus one integer cells.
> +The two cells in order are:
> +
> +1. A phandle pointing to the DMA controller.
> +2. The port ID as specified in the datasheet
> +
> +Example:
> +spi2: spi@...6a000 {
> +       compatible = "allwinner,sun6i-a31-spi";
> +       reg = <0x01c6a000 0x1000>;
> +       interrupts = <0 67 4>;
> +       clocks = <&ahb1_gates 22>, <&spi2_clk>;
> +       clock-names = "ahb", "mod";
> +       dmas = <&dma 25>, <&dma 25>;
> +       dma-names = "rx", "tx";
> +       resets = <&ahb1_rst 22>;
> +};
> --
> 1.9.3
>
> --
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