linux-kernel - Re: [PATCH 3/3] dmaengine: sun6i: Add support for Allwinner A64

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Date:   Thu, 31 Aug 2017 13:44:05 +0200
From:   Code Kipper <codekipper@...il.com>
To:     Stefan Brüns <stefan.bruens@...h-aachen.de>
Cc:     linux-sunxi <linux-sunxi@...glegroups.com>,
        devicetree <devicetree@...r.kernel.org>,
        dmaengine@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 3/3] dmaengine: sun6i: Add support for Allwinner A64

On 31 August 2017 at 01:36, Stefan Brüns <stefan.bruens@...h-aachen.de> wrote:
> The A64 SoC has the same dma engine as the H3 (sun8i), with a
> reduced amount of physical channels. Add the proper config data
> and compatible string to support it.
>
> Signed-off-by: Stefan Brüns <stefan.bruens@...h-aachen.de>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 4 ++++
>  drivers/dma/sun6i-dma.c                       | 7 +++++++
>  2 files changed, 11 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index f96287d3043a..b86019238b77 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -494,6 +494,8 @@
>                         interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
>                         clocks = <&ccu CLK_BUS_SPI0>, <&ccu CLK_SPI0>;
>                         clock-names = "ahb", "mod";
> +                       dmas = <&dma 23>, <&dma 23>;
> +                       dma-names = "rx", "tx";
Hi Stefan,
the dtsi parts should be in a separate patch

>                         pinctrl-names = "default";
>                         pinctrl-0 = <&spi0_pins>;
>                         resets = <&ccu RST_BUS_SPI0>;
> @@ -509,6 +511,8 @@
>                         interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
>                         clocks = <&ccu CLK_BUS_SPI1>, <&ccu CLK_SPI1>;
>                         clock-names = "ahb", "mod";
> +                       dmas = <&dma 24>, <&dma 24>;
> +                       dma-names = "rx", "tx";
>                         pinctrl-names = "default";
>                         pinctrl-0 = <&spi1_pins>;
>                         resets = <&ccu RST_BUS_SPI1>;
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index 5f4eee4513e5..6a17c5d63582 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -1068,6 +1068,12 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
>         .nr_max_vchans   = 34,
>         .dmac_variant    = DMAC_VARIANT_H3,
>  };
> +
> +static struct sun6i_dma_config sun50i_a64_dma_cfg = {
> +       .nr_max_channels = 8,
> +       .nr_max_requests = 27,
> +       .nr_max_vchans   = 38,
> +       .dmac_variant    = DMAC_VARIANT_H3,
>  };
>
>  static const struct of_device_id sun6i_dma_match[] = {
> @@ -1075,6 +1081,7 @@ static const struct of_device_id sun6i_dma_match[] = {
>         { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg },
>         { .compatible = "allwinner,sun8i-a83t-dma", .data = &sun8i_a83t_dma_cfg },
>         { .compatible = "allwinner,sun8i-h3-dma", .data = &sun8i_h3_dma_cfg },
> +       { .compatible = "allwinner,sun50i-a64-dma", .data = &sun50i_a64_dma_cfg },
This all looks fine...it's similar to my patch here
https://github.com/codekipper/linux-sunxi/commit/8c54d9852dfad6ceb478c579a1213f38fb12fa80
which I've been too lazy to post. I think the binding documentation
should go with this patch and this should also be the 1st patch in the
series, followed by the dtsi changes.
BR,
CK
>         { /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sun6i_dma_match);
> --
> 2.14.1
>