On Sun, Aug 14, 2016 at 10:48:22AM +0200, Pavel Machek wrote: > On Sat 2016-08-13 12:03:45, Greg Kroah-Hartman wrote: > > On Sat, Aug 13, 2016 at 05:14:33AM +0200, Sebastian Reichel wrote: > > > From: NeilBrown <neilb@xxxxxxx> > > > > > > A "tty slave" is a device connected via UART. It may need a driver to, > > > for example, power the device on when the tty is opened, and power it > > > off when the tty is released. > > > > > > Signed-off-by: NeilBrown <neilb@xxxxxxx> > > > Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx> > > Acked-by: Pavel Machek <pavel@xxxxxx> > > > > @@ -3317,6 +3318,11 @@ struct device *tty_register_device_attr(struct tty_driver *driver, > > > retval = device_register(dev); > > > if (retval) > > > goto error; > > > + if (device && device->of_node) > > > + /* Children are platform devices and will be > > > + * runtime_pm managed by this tty. > > > + */ > > > + of_platform_populate(device->of_node, NULL, NULL, dev); > > > > Why are these platform devices? And why only OF? > > OF based systems are the only ones that have this problem, so that's > the only place where we can test this solution. > > Given that these devices are connected over the UART, it seems right > to categorize them as platform devices... You can't connect PCI, SATA > or USB device over UART port. No, that's a total abuse of the platform bus, please don't. I've said before that a "serial" bus should be created and you can hang devices off of it. For some reason that message keeps getting ignored... thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
