dmaengine: add dma_request_slave_channel_compat() (864ef69b) · Commits · 戴 / test

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. Suggested-by:

Tony Lindgren <tony@atomide.com> Signed-off-by:

Matt Porter <mporter@ti.com> Acked-by:

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

Arnd Bergmann <arnd@arndb.de> Signed-off-by:

Vinod Koul <vinod.koul@intel.com>

include/linux/dmaengine.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -1001,6 +1001,22 @@ 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)
		#define dma_request_slave_channel_compat(mask, x, y, dev, name) \
		__dma_request_slave_channel_compat(&(mask), x, y, dev, name)

		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)
		{
		struct dma_chan *chan;

		chan = dma_request_slave_channel(dev, name);
		if (chan)
		return chan;

		return __dma_request_channel(mask, fn, fn_param);
		}

		/* --- Helper iov-locking functions --- */

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