On Fri, Dec 22, 2017 at 9:29 PM, Jan Kundrát <jan.kundrat@xxxxxxxxx> wrote: > The push-pull vs. open-drain are the only supported output modes. The > inputs are always unconditionally equipped with weak pull-downs. That's > the only mode, so there's probably no point in exporting that. I wonder > if it's worthwhile to provide a custom dbg_show method to indicate the > current status of the outputs, though. > > This patch and [1] for i2c-gpio together make it possible to bit-bang an > I2C bus over GPIOs of an UART which is connected via SPI :). Yes, this > is crazy, but it's fast enough (while on a 26Mhz SPI HW bus with a > dual-core 1.6GHz CPU) to drive an I2C bus at 200kHz, according to my > scope. > > [1] https://patchwork.ozlabs.org/patch/852591/ > > Signed-off-by: Jan Kundrát <jan.kundrat@xxxxxxxxx> > --- > My suggestion is for this patch to go in via the tty/serial tree; I plan > to send more patches to this driver (and some of them are alreay in > tty-next). --jkt OK Greg can pick this. Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> (Looks very useful for hardware hacking, by the way.) Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
