linux-kernel - Re: [PATCH] drivers: of: Export of_reserved_mem_device

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Message-ID: <20150109183310.GA38065@gandalf.middle.earth.net>
Date:	Fri, 9 Jan 2015 13:33:10 -0500
From:	"George G. Davis" <ggdavisiv@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"George G. Davis" <george_davis@...tor.com>
Subject: Re: [PATCH] drivers: of: Export of_reserved_mem_device_{init,release}

On Fri, Jan 09, 2015 at 11:53:01AM -0600, Rob Herring wrote:
> On Fri, Jan 9, 2015 at 8:29 AM, George G. Davis <ggdavisiv@...il.com> wrote:
> > Export of_reserved_mem_device_{init,release} so that modules
> > can initialize and release their assigned per-device cma_area.
> 
> I believe the original intent was for the core bus code to call these
> functions. While the commit adding them says "automated assignment"
> that part did not go in.

I suspected that there may have been a bit of missing magic.  The only
use of these functions that I was able to find was in an earlier out of
tree patch series where these functions were called from the s5p-mfc
driver:

http://lists.linaro.org/pipermail/linaro-mm-sig/2014-August/004140.html

I agree that "automated assignment" via core bus code would be a better
solution but I don't know where to add the calls.

> As it stands, there are no in tree users of
> these functions.
> 
> Marek, comments?

Thanks!

--
Regards,
George

> 
> Rob
> 
> >
> > Signed-off-by: George G. Davis <george_davis@...tor.com>
> > ---
> >  drivers/of/of_reserved_mem.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> > index dc566b3..5eeb5b2 100644
> > --- a/drivers/of/of_reserved_mem.c
> > +++ b/drivers/of/of_reserved_mem.c
> > @@ -265,6 +265,7 @@ int of_reserved_mem_device_init(struct device *dev)
> >
> >         return ret;
> >  }
> > +EXPORT_SYMBOL(of_reserved_mem_device_init);
> >
> >  /**
> >   * of_reserved_mem_device_release() - release reserved memory device structures
> > @@ -289,3 +290,4 @@ void of_reserved_mem_device_release(struct device *dev)
> >
> >         rmem->ops->device_release(rmem, dev);
> >  }
> > +EXPORT_SYMBOL(of_reserved_mem_device_release);
> > --
> > 1.9.3
> >
--
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