Re: Status variable
flat view
From: Arnd Bergmann <hidden>
Date: 2016-01-29 08:49:37
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-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html