On Thursday 26 July 2007, Ned Forrester wrote: > David Brownell wrote: > > On Thursday 26 July 2007, Anton Vorontsov wrote: > >> Loopback mode is supported by various controllers, this mode > >> is useful for testing, especially in conjunction with spidev > >> driver. > > > > ISTR that Stephen Street provided a loopback mode for debug > > in his pxa2xx_spi code. And I know you're fight that this > > mode shows up in a lot of hardware. > > > > Comments, anyone? This seems like a fair way to expose this > > mechanism. And I tend to agree that it'd mostly be useful in > > conjunction with "spidev". > > Yes, it is in pxa2xx_spi. It is passed in a structure that is attached > to spi_board_info.controller_data. I have used it to great effect to > test data modes in the driver for which I have no external hardware > support: various bits/word, clock frequencies, fifo thresholds, dma > burst sizes, etc.
Well, the SPI_LOOP stuff is now in kernel.org GIT and 2.6.23-rc2, so if someone wants to update pxa2xx_spi to support this through spi->mode instead of controller data, now is a good time to start working on that. - Dave _______________________________________________ Linuxppc-dev mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-dev
