Re: [PATCH v4 1/7] mfd: add syscon driver based on regmap

[Dong Aisheng <b29396-KZfg59tc24xl57MIdRCFDg@public.gmane.org>]

On Mon, Sep 03, 2012 at 11:09:01AM +0800, Shawn Guo wrote:
> On Mon, Sep 03, 2012 at 10:31:03AM +0800, Dong Aisheng wrote:
> > > 
> > > I think of_node_put should be moved out from here and put into
> > > syscon_node_to_regmap and syscon_regmap_lookup_by_compatible.
> > > 
> > I guess no, if you want to move of_node_put into syscon_regmap_lookup_by_phandle,
> > then syscon_regmap_lookup_by_phandle has the same issue.
> 
> I guess not.  syscon_regmap_lookup_by_phandle itself calls of_parse_phandle,
> and that's where the refcount gets incremented, so syscon_regmap_lookup_by_phandle
> should be responsible for calling of_node_put to get the refcount decremented.
> 
Yes, the of_node_put will be done in syscon_node_to_regmap which is called by
syscon_regmap_lookup_by_phandle,
The reason why we do it is as i said in my last reply.

I think one known issue is that syscon_node_to_regmap may not be suitable to
be used by the driver who still wants to use the regmap node after calling the
syscon_node_to_regmap.
I still do not find such using case but i'm not sure whether it may exist.

Probably the safe way currently to do is just as you said:
Not put the node in syscon_node_to_regmap and let user decide.
Ok, i will update it.

Regards
Dong Aisheng