linux-kernel - Re: [PATCH v2 08/10] dmaengine: sun6i: Add support for Allwinner A64 and compatibles

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Date:   Mon, 18 Sep 2017 10:19:28 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Stefan Brüns <stefan.bruens@...h-aachen.de>
Cc:     linux-sunxi@...glegroups.com, devicetree@...r.kernel.org,
        dmaengine@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Code Kipper <codekipper@...il.com>,
        Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v2 08/10] dmaengine: sun6i: Add support for Allwinner A64
 and compatibles

On Sun, Sep 17, 2017 at 05:19:54AM +0200, Stefan Brüns wrote:
> The A64 SoC has the same dma engine as the H3 (sun8i), with a
> reduced amount of physical channels. To allow future reuse of the
> compatible, leave the channel count etc. in the config data blank
> and retrieve it from the devicetree.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens@...h-aachen.de>
> ---
>  drivers/dma/sun6i-dma.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index b5ecc97a0d5a..118b29bb1eac 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -1127,6 +1127,28 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
>  			     BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
>  };
>  
> +/*
> + * The A64 binding uses the number of dma channels from the
> + * device tree node.
> + */
> +static struct sun6i_dma_config sun50i_a64_dma_cfg = {
> +	.nr_max_channels = 0,
> +	.nr_max_requests = 0,
> +	.nr_max_vchans   = 0,

Those are the default values. I appreciate that you wanted them here
for documentation, but the comment above already fills up that role
fine.

Once removed,

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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