[PATCH v4 1/7] Documentation: Add device tree bindings for Freescale i.MX GPC

On 19.02.2014 15:38, Arnd Bergmann wrote:

On Wednesday 19 February 2014, Philipp Zabel wrote:

quoted

Am Dienstag, den 18.02.2014, 19:10 +0100 schrieb Arnd Bergmann:

quoted

On Tuesday 18 February 2014 16:34:41 Philipp Zabel wrote:

quoted

+
+Example of a device that is part of a power domain:
+
+       vpu: vpu at 02040000 {
+               reg = <0x02040000 0x3c000>;
+               /* ... */
+               fsl,power-domain = <&pd_pu>;
+               /* ... */
+       };
+

I'm really not too happy about platforms starting to add random
bindings for power domains. Unfortunately I didn't catch exynos
doing this first, but I don't want to see another platform like
that.

Can we please come up with a proper generic power domain binding
first and then add platform specific users?

what is the process here? I've seen the samsung bindings and copied the
pattern. I guess the Exynos bindings are set in stone, and the i.MX
power domains can be handled using the same bindings.

* First of all, get the pm domain maintainers into the loop, then make
   sure all other users of pm domains are aware of what you are doing.

* Come up with a way to describe a pm_domain in a sufficiently generic
   way. It's possible you just need a phandle, but experience on other
   subsystems suggests that it helps to allow arguments, as we do for
   clocks, dmas, mailboxes, etc.

* Draft a generic binding that can work on all platforms

* Implement support for the generic binding in the platform independent
   code.

* Add a specific binding for your hardware.

* Implement support for your hardware binding on top of the generic
   code.

* Get everyone involved to Ack the generic binding and implementation.

	Arnd

Just wanted to share a link with you. ;)

http://www.spinics.net/lists/devicetree/msg18051.html

Best regards,
Tomasz