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

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Date:	Tue, 11 Mar 2014 13:48:23 +0200
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Chew Chiau Ee <chiau.ee.chew@...el.com>,
	Mika Westerberg <mika.westerberg@...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 03/11/2014 12:27 PM, Linus Walleij wrote:
> 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. ;-)

Hate to admit it but so it seems :)

>
> Mika/Mathias: any comments?

Patch looks fine

Acked-by: Mathias Nyman <mathias.nyman@...ux.intel.com>

-Mathias
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