linux-kernel - Re: [PATCH] pinctrl: changes hog mechanism to be self-referential

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Date:	Fri, 10 Feb 2012 07:35:26 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Stephen Warren <swarren@...dia.com>,
	Barry Song <21cnbao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Rajendra Nayak <rajendra.nayak@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [PATCH] pinctrl: changes hog mechanism to be self-referential

Linus Walleij writes:
> Instead of a specific boolean field to indicate if a map entry shall
> be hogged, treat self-reference as an indication of desired hogging.
> This drops one field off the map struct and has a nice Douglas R.
> Hofstadter-feel to it.
> 
> Suggested-by: Stephen Warren <swarren@...dia.com>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  Documentation/pinctrl.txt       |    8 ++++----
>  drivers/pinctrl/core.c          |    6 ++----
>  include/linux/pinctrl/machine.h |   18 ++++++------------
>  3 files changed, 12 insertions(+), 20 deletions(-)
> 
> diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt
> index 2e71323..acb9078 100644
> --- a/Documentation/pinctrl.txt
> +++ b/Documentation/pinctrl.txt
> @@ -989,21 +989,21 @@ is registered. This means that the core will attempt to call pinctrl_get() and
>  pinctrl_enable() on it immediately after the pin control device has been
>  registered.
>  
> -This is enabled by simply setting the .hog_on_boot field in the map to true,
> -like this:
> +This is enabled by simply setting the .dev_name field in the map to the name
> +of the pin controller itself, like this:
>  
>  {
>  	.name = "POWERMAP"
>  	.ctrl_dev_name = "pinctrl-foo",
>  	.function = "power_func",
> -	.hog_on_boot = true,
> +	.dev_name = "pinctrl-foo",
>  },
>  
>  Since it may be common to request the core to hog a few always-applicable
>  mux settings on the primary pin controller, there is a convenience macro for
>  this:
>  
> -PIN_MAP_PRIMARY_SYS_HOG("POWERMAP", "power_func")
> +PIN_MAP_PRIMARY_SYS_HOG("POWERMAP", "pinctrl-foo". "power_func")
                                                    ^
Shouldn't this be a comma rather than a period?

Lothar Waßmann
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