linux-kernel - Re: [PATCH v3] of/overlay: add of overlay notifications

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Date:	Fri, 22 Apr 2016 16:19:52 -0500
From:	atull <atull@...nsource.altera.com>
To:	Rob Herring <robh+dt@...nel.org>
CC:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Moritz Fischer <moritz.fischer@...us.com>,
	Pantelis Antoniou <pantelis.antoniou@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>
Subject: Re: [PATCH v3] of/overlay: add of overlay notifications

On Tue, 19 Apr 2016, Rob Herring wrote:

> On Thu, Mar 3, 2016 at 9:10 AM, Alan Tull <atull@...nsource.altera.com> wrote:
> > This patch add of overlay notifications.
> >
> > When DT overlays are being added, some drivers/subsystems
> > need to see device tree overlays before the changes go into
> > the live tree.
> >
> > This is distinct from reconfig notifiers that are
> > post-apply or post-remove and which issue very granular
> > notifications without providing access to the context
> > of a whole overlay.
> >
> > The following 4 notificatons are issued:
> >   OF_OVERLAY_PRE_APPLY
> >   OF_OVERLAY_POST_APPLY
> >   OF_OVERLAY_PRE_REMOVE
> >   OF_OVERLAY_POST_REMOVE
> >
> > In the case of pre-apply notification, if the notifier
> > returns error, the overlay will be rejected.
> >
> > This patch exports two functions for registering/unregistering
> > notifications:
> >   of_overlay_notifier_register(struct notifier_block *nb)
> >   of_overlay_notifier_unregister(struct notifier_block *nb)
> >
> > The of_mutex is held during these notifications. The
> > notification data includes pointers to the overlay target
> > and the overlay:
> >
> > struct of_overlay_notify_data {
> >        struct device_node *overlay;
> >        struct device_node *target;
> > };
> >
> > Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> > ---
> > v2: add missing 'static inline' in of.h
> > v3: fix build for !OF_OVERLAY in of.h
> >     add a note in the header that the of_mutex is held
> > ---
> >  drivers/of/overlay.c |   47 ++++++++++++++++++++++++++++++++++++++++++++++-
> >  include/linux/of.h   |   25 +++++++++++++++++++++++++
> >  2 files changed, 71 insertions(+), 1 deletion(-)
> 
> This looks fine to me, but apply it when you have a user.
> 
> Acked-by: Rob Herring <robh@...nel.org>
> 
> Rob

Thanks!

I think I'll be the first user.

Alan

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