linux-kernel - Re: [PATCH 38/39] dmaengine: ste_dma40: Fetch the number of physical channels from DT

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Date:	Thu, 16 May 2013 12:04:14 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	balbi@...com, linux-usb@...r.kernel.org,
	linux-crypto@...r.kernel.org, davem@...emloft.net,
	herbert@...dor.hengli.com.au, arnd@...db.de,
	linus.walleij@...ricsson.com, srinidhi.kasagar@...ricsson.com,
	Dan Williams <djbw@...com>,
	Per Forlin <per.forlin@...ricsson.com>,
	Rabin Vincent <rabin@....in>
Subject: Re: [PATCH 38/39] dmaengine: ste_dma40: Fetch the number of
 physical channels from DT

On Wed, May 15, 2013 at 10:52:01AM +0100, Lee Jones wrote:
> Some platforms insist on obscure physical channel availability. This
> information is currently passed though platform data in internal BSP
> kernels. Once those platforms land, they'll need to configure them
> appropriately, so we may as well add the infrastructure.
> 
> Cc: Vinod Koul <vinod.koul@...el.com>
> Cc: Dan Williams <djbw@...com>
> Cc: Per Forlin <per.forlin@...ricsson.com>
> Cc: Rabin Vincent <rabin@....in>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
Acked-by: Vinod Koul <vinod.koul@...el.com>

>  drivers/dma/ste_dma40.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index ae462d3..4e528dd 100644
> --- a/drivers/dma/ste_dma40.c
> +++ b/drivers/dma/ste_dma40.c
> @@ -3482,7 +3482,7 @@ static int __init d40_of_probe(struct platform_device *pdev,
>  			       struct device_node *np)
>  {
>  	struct stedma40_platform_data *pdata;
> -	int num_memcpy = 0;
> +	int num_phy = 0, num_memcpy = 0;
>  	const const __be32 *list;
>  
>  	pdata = devm_kzalloc(&pdev->dev,
> @@ -3491,6 +3491,11 @@ static int __init d40_of_probe(struct platform_device *pdev,
>  	if (!pdata)
>  		return -ENOMEM;
>  
> +	/* If absent this value will be obtained from h/w. */
> +	of_property_read_u32(np, "dma-channels", &num_phy);
> +	if (num_phy > 0)
> +		pdata->num_of_phy_chans = num_phy;
> +
>  	list = of_get_property(np, "memcpy-channels", &num_memcpy);
>  	num_memcpy /= sizeof(*list);
>  
> -- 
> 1.7.10.4
> 
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