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Date: Thu, 12 Dec 2013 13:14:04 +0100
From: Hiroshi Doyu <hdoyu@...dia.com>
To: "swarren@...dotorg.org" <swarren@...dotorg.org>,
"grant.likely@...aro.org" <grant.likely@...aro.org>
CC: "thierry.reding@...il.com" <thierry.reding@...il.com>,
"robherring2@...il.com" <robherring2@...il.com>,
"joro@...tes.org" <joro@...tes.org>,
Stephen Warren <swarren@...dia.com>,
"will.deacon@....com" <will.deacon@....com>,
"mark.rutland@....com" <mark.rutland@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"galak@...eaurora.org" <galak@...eaurora.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv6+ 01/13] of: introduce
of_property_for_earch_phandle_with_args()
Grant Likely <grant.likely@...aro.org> wrote @ Thu, 12 Dec 2013 12:34:17 +0100:
> On Wed, 11 Dec 2013 14:33:38 +0100, Hiroshi Doyu <hdoyu@...dia.com> wrote:
> > Hi Grant,
> >
> > Grant Likely <grant.likely@...aro.org> wrote @ Wed, 11 Dec 2013 14:28:45 +0100:
> >
> > > On Thu, 21 Nov 2013 11:57:00 -0700, Stephen Warren <swarren@...dotorg.org> wrote:
> > > > On 11/21/2013 10:17 AM, Hiroshi Doyu wrote:
> > > > > Iterating over a property containing a list of phandles with arguments
> > > > > is a common operation for device drivers. This patch adds a new
> > > > > of_property_for_each_phandle_with_args() macro to make the iteration
> > > > > simpler.
> > > > >
> > > > > Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
> > > > > ---
> > > > > v6+:
> > > > > Use the description, which Grant Likely proposed, to be full enough
> > > > > that a future reader can figure out why a patch was written.
> > > > > http://lists.linuxfoundation.org/pipermail/iommu/2013-November/007062.html
> > ...
> >
> > > That's right, I forgot I said that. Yes please fix the implementation.
> >
> > Here's the latest. I'll include this with the next v7 series.
> >
> > Can I get your Acked-by with this?
> >
> > --8<----
> >
> > From 8f7c0404aa68f0e8dbe0babc240590f6528ecc1f Mon Sep 17 00:00:00 2001
> > From: Hiroshi Doyu <hdoyu@...dia.com>
> > Date: Fri, 15 Nov 2013 10:52:53 +0200
> > Subject: [PATCH] of: introduce of_property_for_each_phandle_with_args()
> >
> > Iterating over a property containing a list of phandles with arguments
> > is a common operation for device drivers. This patch adds a new
> > of_property_for_each_phandle_with_args() macro to make the iteration
> > simpler.
> >
> > Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
> > Cc: Rob Herring <robherring2@...il.com>
> > ---
> > v7:
> > Fixed some minors pointed by Rob and Stephen.
> >
> > v6++++:
> > Iterate without intrducing a new struct.
> >
> > v6+++:
> > Introduced a new struct "of_phandle_iter" to keep the state when
> > iterating over the list.
> >
> > v6++:
> > Optimized to avoid O(n^2), suggested by Stephen Warren.
> > http://lists.linuxfoundation.org/pipermail/iommu/2013-November/007066.html
> >
> > I didn't introduce any struct to hold params and state here.
> >
> > v6+:
> > Use the description, which Grant Likely proposed, to be full enough
> > that a future reader can figure out why a patch was written.
> >
> > v5:
> > New patch for v5.
> >
> > Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
> > ---
> > drivers/of/base.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/of.h | 32 ++++++++++++++++++++++++++++++++
> > 2 files changed, 78 insertions(+)
> >
> > diff --git a/drivers/of/base.c b/drivers/of/base.c
> > index f807d0e..cd4ab05 100644
> > --- a/drivers/of/base.c
> > +++ b/drivers/of/base.c
> > @@ -1201,6 +1201,52 @@ void of_print_phandle_args(const char *msg, const struct of_phandle_args *args)
> > printk("\n");
> > }
> >
> > +const __be32 *of_phandle_iter_next(const char *cells_name, int cell_count,
> > + const __be32 *cur, const __be32 *end,
> > + struct of_phandle_args *out_args)
>
> Having to pass in cells_name, cell_count, cur and end each time seems a
> little odd. Can a state structure be used instead?
>
> struct of_phandle_iter_state {
> const char *cells_name;
> int cells_count;
> const __be32 *cur;
> const __be32 *end;
> struct of_phandle_args out_args;
> }
>
> Make the caller provide one of those and fill it in with the init
> function.
I rewrote this a few times and so now I have a few version of this
implementations :-) The above proposal is similar to the version v6+++
mentioned in the above patch note:
> > v6+++:
> > Introduced a new struct "of_phandle_iter" to keep the state when
> > iterating over the list.
which is:
[RFC][PATCHv6+++ 01/13] of: introduce of_property_for_earch_phandle_with_args()
http://lists.linuxfoundation.org/pipermail/iommu/2013-November/007087.html
Stephen seemed to prefer the version without state struct. I like the
idea to not pass the same arguments repeatly. Instead, wrapping them
in a struct with state may look better.
So if Stephen agrees, I'll rewrite the version with state struct
again.
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