Hello Bergman, Sorry to bother you again: I was going through this: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/of/base.c#n524 Status should be absent or okay and "ok". Otherwise the entry is treated as disabled. Is this understanding correct? On Fri, Jan 29, 2016 at 2:19 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > On Friday 29 January 2016 14:13:20 Ryan wrote: >> Hello, >> >> I am confused about the "status" variables on a device tree. What is >> the meaning of >> status="okay", status="enabled", status="disabled". >> >> the function: __of_device_is_available returns 1 if the entry itself >> is not there. >> >> Why is this? >> >> Thanks for your time. > > On status="disabled" is defined to have an effect and will prevent > the device from being used. Any other value or an absent status > property is interpreted as a working device. > > The common way this is used is that a soc-specific .dtsi file lists > all devices that are present within the soc, but marks the ones as > disabled that are not always usable because they depend on a external > connection (e.g. a uart only makes sense if it talks to something, > while a timer device is always usable). A board specific file then > does not need to define the entire device but just override the > status as "okay". > > 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
