linux-kernel - Re: [PATCH v2 all 00/14] use of_platform_default

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Date:	Tue, 19 Apr 2016 16:10:51 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Shawn Guo <shawnguo@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v2 all 00/14] use of_platform_default_populate() to
 populate default bus

On Wed, Mar 16, 2016 at 2:35 AM, Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
> Use helper of_platform_default_populate() in linux/of_platform
> when possible, instead of calling of_platform_populate() with
> the default match table.
>
> Then it is possible for driver code build as a module, and no
> need to export of_default_bus_match_table anymore.
>
> This patchset is based on Linux 4.5.
>
> Changes since v1:
> - Add ack, test and review
> - Remove v1 patch 14/15, the similar patch has posted and applied,
>   see https://patchwork.kernel.org/patch/8096991/
>
> v1:
> - https://lkml.org/lkml/2016/1/26/1123

I was going to apply this, but I've thought about this some more and
it is a lot of tree wide churn for little gain. Most of the call sites
here I want to get rid of by making of_platform_populate callable
multiple times. The infrastructure is almost there, but I think we
just need something like this:

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 8d103e4..b25e710 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -345,6 +345,9 @@ static int of_platform_bus_create(struct device_node *bus,
                return 0;
        }

+       if (of_node_check_flag(bus, OF_POPULATED_BUS))
+               return 0;
+
        auxdata = of_dev_lookup(lookup, bus);
        if (auxdata) {
                bus_id = auxdata->name;

Then we can call of_platform_populate from the DT core and remove all
the default calls.

Rob