linux-kernel - Re: [PATCH v5 07/14] dmaengine: add dma_request_slave_channel

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Message-ID: <CAHp75VeqikcTuOd14utb9E0P3b9t1mr=JsmkAbz5=3FJwU2kFA@mail.gmail.com>
Date:	Mon, 28 Jan 2013 21:34:25 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Matt Porter <mporter@...com>
Cc:	Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Arnd Bergmann <arnd@...db.de>, Dan Williams <djbw@...com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v5 07/14] dmaengine: add dma_request_slave_channel_compat()

On Tue, Jan 15, 2013 at 10:32 PM, Matt Porter <mporter@...com> wrote:
> Adds a dma_request_slave_channel_compat() wrapper which accepts
> both the arguments from dma_request_channel() and
> dma_request_slave_channel(). Based on whether the driver is
> instantiated via DT, the appropriate channel request call will be
> made.
>
> This allows for a much cleaner migration of drivers to the
> dmaengine DT API as platforms continue to be mixed between those
> that boot using DT and those that do not.

Does it mean the introduced function is kinda temporary?

>
> Suggested-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Matt Porter <mporter@...com>
> Acked-by: Tony Lindgren <tony@...mide.com>
> ---
>  include/linux/dmaengine.h |   10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 9fd0c5b..64f9f69 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -1047,6 +1047,16 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
>  struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type);
>  struct dma_chan *net_dma_find_channel(void);
>  #define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y)
> +static inline struct dma_chan
> +*dma_request_slave_channel_compat(dma_cap_mask_t mask, dma_filter_fn fn,
> +                                 void *fn_param, struct device *dev,
> +                                 char *name)
> +{
> +       if (dev->of_node)
> +               return dma_request_slave_channel(dev, name);
> +       else
> +               return dma_request_channel(mask, fn, fn_param);
> +}
>
>  /* --- Helper iov-locking functions --- */
>
> --
> 1.7.9.5
>
> --
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-- 
With Best Regards,
Andy Shevchenko
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