linux-kernel - Re: [PATCH 1/8] dmaengine: ste_dma40: Assign memcpy channels in the driver

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Date:	Wed, 24 Apr 2013 15:45:37 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Arnd Bergmann <arnd@...db.de>,
	Vinod Koul <vinod.koul@...el.com>,
	Per Forlin <per.forlin@...ricsson.com>,
	Dan Williams <djbw@...com>
Subject: Re: [PATCH 1/8] dmaengine: ste_dma40: Assign memcpy channels in the driver

On Tue, Apr 9, 2013 at 8:39 PM, Lee Jones <lee.jones@...aro.org> wrote:

> The channels reserved for memcpy are the same for all currently
> supported platforms. With this in mind, we can ease the platform
> data passing requirement by moving these assignments out from
> platform code and place them directly into the driver.
>
> Cc: Vinod Koul <vinod.koul@...el.com>
> Cc: Dan Williams <djbw@...com>
> Cc: Per Forlin <per.forlin@...ricsson.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

(...)

> -/* Reserved event lines for memcpy only */
> -static int dma40_memcpy_event[] = {
> -       DB8500_DMA_MEMCPY_TX_0,
> -       DB8500_DMA_MEMCPY_TX_1,
> -       DB8500_DMA_MEMCPY_TX_2,
> -       DB8500_DMA_MEMCPY_TX_3,
> -       DB8500_DMA_MEMCPY_TX_4,
> -       DB8500_DMA_MEMCPY_TX_5,
> -};

(...)

> +/* Reserved event lines for memcpy only. */
> +static int dma40_memcpy_channels[] = { 56, 57, 58, 59, 60 };

So what's so bad with using the #defines?

I would prefer if you took the entire content of
arch/arm/mach-ux500/ste-dma40-db8500.h
and copied into the DMA driver, so you atleast
have a chance of understanding what these numbers
are about.

Yours,
Linus Walleij
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