linux-kernel - Re: [PATCH v4 07/14] dmaengine: add dma_request_slave_channel

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Message-ID: <20130111175223.GF14149@atomide.com>
Date:	Fri, 11 Jan 2013 09:52:23 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Matt Porter <mporter@...com>
Cc:	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 v4 07/14] dmaengine: add
 dma_request_slave_channel_compat()

* Matt Porter <mporter@...com> [130110 21:47]:
> 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.

Cool, looks like the driver changes are quite minimal after this:

Acked-by: Tony Lindgren <tony@...mide.com>

> 
> Suggested-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Matt Porter <mporter@...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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