linux-kernel - Re: [PATCH] pinctrl: tegra1x4: initialize at arch

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Message-ID: <52D41C6C.9060500@wwwdotorg.org>
Date:	Mon, 13 Jan 2014 10:03:40 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Thierry Reding <thierry.reding@...il.com>,
	Andrew Bresticker <abrestic@...omium.org>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: tegra1x4: initialize at arch_initcall time

On 01/13/2014 02:02 AM, Thierry Reding wrote:
> On Fri, Jan 10, 2014 at 04:50:16PM -0800, Andrew Bresticker wrote:
>> Many devices rely on pinctrl/pinmux settings being applied
>> before probing and some of these may probe before device_initcall
>> time (e.g. i2c at subsys_initcall).  Move Tegra1x4 pinctrl driver
>> registration to arch_initcall time so that proper pin settings
>> can be applied earlier.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
>> ---
>>  drivers/pinctrl/pinctrl-tegra114.c | 13 ++++++++++++-
>>  drivers/pinctrl/pinctrl-tegra124.c | 13 ++++++++++++-
>>  2 files changed, 24 insertions(+), 2 deletions(-)
> 
> I wonder if a better approach would be to add pin control and pin mux
> settings for devices that explicitly need them to the device tree nodes
> of the devices themselves.

We can't do that; the entire pinctrl state needs to be programmed at
once to avoid the conflict of multiple pins/groups being muxed to the
same function. However, we can make this work with empty states I believe.
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