On Wed, May 21, 2008 at 05:54:20PM +0200, Guennadi Liakhovetski wrote: > On Wed, 21 May 2008, Anton Vorontsov wrote: > > > This is just a bait for further discussion of OF/SPI, chip-selects, > > e.t.c. > > > > I've converted the spi_mpc83xx to the OF driver (using Grant's > > SPI_MASTER_OF work + some additions), and implemented MMC-over-SPI > > bindings. This stuff extensively using GPIOs, and I think this will > > work for the "bridged SPI" too, since the SPI bridge could be > > represented as GPIO controller (inside the SPI controller node). > > Yes, but do you really _want_ to represent them as GPIOs? Firstly they are > not really "G" P, secondly, they are not even "I", rather only "O".
"General Purpose Input/Output" implies that lines could be only I or only O, or both. (plus "dedicated function", though, here David Brownell will probably disagree ;-) GPIOs are really general. > And do > you really want to register your SPI CS lines to the whole system for > everyone's (ab)use?... This is represented via device tree, so the only abusers could be hardware designers. :-) -- Anton Vorontsov email: [EMAIL PROTECTED] irc://irc.freenode.net/bd2 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev