linux-kernel - Re: [PATCH] pinctrl-baytrail: add function mux checking in gpio pin request

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Date:	Tue, 11 Mar 2014 11:27:13 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Chew Chiau Ee <chiau.ee.chew@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:	Darren Hart <dvhart@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl-baytrail: add function mux checking in gpio pin request

On Thu, Mar 6, 2014 at 2:59 PM, Chew Chiau Ee <chiau.ee.chew@...el.com> wrote:

> From: Chew, Kean Ho <kean.ho.chew@...el.com>
>
> The requested gpio pin must has the func_pin_mux field set
> to GPIO function by BIOS/FW in advanced. Else, the gpio pin
> request would fail. This is to ensure that we do not expose
> any gpio pins which shall be used for alternate functions,
> for eg: wakeup pin, I/O interfaces for LPSS, etc.
>
> Signed-off-by: Chew, Kean Ho <kean.ho.chew@...el.com>
> Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@...el.com>

Patch applied with Darren's ACK.

This confirms my suspicion that you will not be able to
hide the pin control interface side of this hardware forever. ;-)

Mika/Mathias: any comments?

Yours,
Linus Walleij
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