[PATCH v2 2/2] leds/powernv: Add driver for PowerNV platform

[Stewart Smith]

Jacek Anaszewski <j.anaszewski81 at gmail.com> writes:
>> These device tree comes from out firmware ... which is immutable .
>
> How the firmware is related to kernel? These bindings are for kernel,
> not for the firmware.
>
> DT bindings are compiled to *.dtb file which is concatenated with
> zImage. During system boot device drivers are matched with DT bindings
> through 'compatible' property. A driver should have single matching DT
> node, i.e. no other driver can probe with the same DT node.
> This implies that the node should contain only the properties required
> for configuring the related device.

For OPAL firmware on POWER, firmware hands kernel a flattened device
tree of the machine it's booting on. It's not added to kernel as the
kernels aren't board specific - they're generic.

https://github.com/open-power/skiboot/ is the firmware that generates
the device tree for booting under OPAL.