On Monday 04 January 2010 04:46:19 Sudhakar Rajashekhara wrote: > On Fri, Dec 25, 2009 at 22:41:13, Dirk Behme wrote: > > I wonder if all (SPI API) functions from include/spi.h should be > > implemented? I.e. do we need (dummy) functions for spi_cs_is_valid(), > > spi_cs_activate() and spi_cs_deactivate(), too? Just in case a driver > > does use them. > > Currently none of the SPI Flash drivers are using the above functions. I'll > implement the above functions as dummy and later as and when the need > arises, these functions will be implemented.
considering the SPI protocol, the implementation for the spi_cs_* functions should fall naturally into place if the driver is architected properly. in other words, your bus driver should already be relying on these functions -- you call them when you begin/end a transfer. same goes for spi_cs_is_valid ... your spi_setup_slave function shouldnt be accepting any random cs value given to it. the Blackfin driver shows that these are all pretty trivial to get right. -mike
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