On 22 June 2016 at 16:58, Jon Hunter [off-list ref] wrote:

Hi Ulf,

On 04/03/16 11:23, Jon Hunter wrote:

quoted

Ideally, if we are returning a reference to a PM domain via a call to
of_genpd_get_from_provider(), then we should keep track of such
references via a reference count. The reference count could then be used
to determine if a PM domain can be safely removed. Alternatively, it is
possible to avoid such external references by providing APIs to access
the PM domain and hence, eliminate any calls to
of_genpd_get_from_provider().

Add new helper functions for adding a device and a subdomain to a PM
domain when using device-tree, so that external calls to
of_genpd_get_from_provider() can be removed.

While we are at it, does it make sense to add helpers for
of_genpd_remove_device/subdomain() as well? Seems that these could be
useful for doing the inverse when cleaning up.

I would prefer if we could avoid adding new APIs until we really see
the need for it.

Moreover, I would like to avoid us adding OF specific APIs, unless
those can be really justified.
Hope that made sense.

Kind regards
Uffe