linux-kernel - Re: [PATCH] pinctrl: reserve pins when states are activated

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Message-ID: <5085A883.9010803@wwwdotorg.org>
Date:	Mon, 22 Oct 2012 14:11:47 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Linus Walleij <linus.walleij@...ricsson.com>
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Stephen Warren <swarren@...dia.com>,
	Anmar Oueja <anmar.oueja@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Patrice Chotard <patrice.chotard@...com>,
	Loic Pallardy <loic.pallardy@...com>
Subject: Re: [PATCH] pinctrl: reserve pins when states are activated

On 10/22/2012 02:15 AM, Linus Walleij wrote:
> This switches the way that pins are reserved for multiplexing:
> 
> We used to do this when the map was parsed, at the creation of
> the settings inside the pinctrl handle, in pinmux_map_to_setting().
> 
> However this does not work for us, because we want to use the
> same set of pins with different devices at different times: the

> diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c

>  void pinmux_free_setting(struct pinctrl_setting const *setting)
...
> +	/* This function is currently unused */

Being picky: It's not unused; it is used by pinctrl_put_locked(), but
just doesn't have to do anything given the implementation of
pinmux_map_to_setting().
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