On Wed, May 13, 2015 at 2:51 PM, Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: >> > This also adds an i2cdev-like feeling, where you get all the >> > spidev devices all the time, without any modification. >> >> I2C is a bit safer here since it's a shared bus so you can't do >> anything to devices not connected to the bus by mistake. > > I'm not sure to understand what you mean here. How is SPI different > from that aspect? If you talk to a nonexistent i2c device, nothing happens, as it just sends a message with a nonexistent address on the shared bus. If you talk to a nonexistent spi device, hell may break loose if e.g. some "smart" hardware engineer used the "unused" CS as a pull-up for the _RESET line on an external device... It's a bit like banging random "unused" GPIOs. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html