linux-kernel - Re: [PATCH 5/9] dmaengine: sun6i: support V3s SoC variant

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Date:   Mon, 27 Feb 2017 08:50:21 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Vinod Koul <vinod.koul@...el.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Mark Brown <broonie@...nel.org>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH 5/9] dmaengine: sun6i: support V3s SoC variant

On Sat, Feb 25, 2017 at 08:30:25PM +0800, Icenowy Zheng wrote:
> Allwinner V3s has a DMA engine similar to the ones from A31, but with
> fewer channels and DRQs.
> 
> Add support for it.
> 
> As it also needs the special gate bit, make the gate bit generic.

That should be part of a separate patch.

> 
> According to BSP source code, SUN8IW6 (A83T) also needs the bit, so it
> have also been specified gate_needed property.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> ---
>  Documentation/devicetree/bindings/dma/sun6i-dma.txt |  1 +
>  drivers/dma/sun6i-dma.c                             | 17 ++++++++++++++---
>  2 files changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> index 6b267045f522..98fbe1a5c6dd 100644
> --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> @@ -9,6 +9,7 @@ Required properties:
>  		  "allwinner,sun8i-a23-dma"
>  		  "allwinner,sun8i-a83t-dma"
>  		  "allwinner,sun8i-h3-dma"
> +		  "allwinner,sun8i-v3s-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
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index a2358780ab2c..1f38424c1b14 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -101,6 +101,7 @@ struct sun6i_dma_config {
>  	u32 nr_max_channels;
>  	u32 nr_max_requests;
>  	u32 nr_max_vchans;
> +	bool gate_needed;
>  };
>  
>  /*
> @@ -1009,12 +1010,14 @@ static struct sun6i_dma_config sun8i_a23_dma_cfg = {
>  	.nr_max_channels = 8,
>  	.nr_max_requests = 24,
>  	.nr_max_vchans   = 37,
> +	.gate_needed	 = true,
>  };
>  
>  static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
>  	.nr_max_channels = 8,
>  	.nr_max_requests = 28,
>  	.nr_max_vchans   = 39,
> +	.gate_needed	 = true,
>  };
>  
>  /*
> @@ -1028,11 +1031,19 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = {
>  	.nr_max_vchans   = 34,
>  };
>  
> +static struct sun6i_dma_config sun8i_v3s_dma_cfg = {
> +	.nr_max_channels = 8,
> +	.nr_max_requests = 23,
> +	.nr_max_vchans   = 24,

This one is suspicious. There's just a single endpoint that can be
used in both directions?

Maxime

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

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