On Saturday 11 January 2014, Andrew Lunn wrote: > The id of -1 causes platform_device_add() to set the device name to > plain "gpio-keys". > > When using DT, the device name is created by the function > of_device_make_bus_id(). It has the following comment: > > * This routine will first try using either the dcr-reg or the reg property > * value to derive a unique name. As a last resort it will use the node > * name followed by a unique number. > > Since the gpio_keys node does not have a reg properties, it gets a > unique number appended to it. We end up with the device name > "gpio_keys.3" > > So as it stands, it does not appear i can make the DT system use the > same device name as a board system. > > But i'm also a little bit concerned by the "unique number" and this > ending up in /dev/input/by-path/platform-gpio_keys.3-event. Is this > path supposed to be stable? This unique number is not stable. An > unwitting change to the DT could cause its value to change. Do we need > to make it stable? > One possibility would be to create an artificial bus in DT for all gpio-keys devices, use #address-cells=<1> and #size-cells=<0> for it, and give each device a unique reg property. Not sure if that would be considered an elegant solution though. Arnd -- 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
