linux-kernel - Re: [PATCH v3 1/1] pinctrl: add Intel BayTrail GPIO/pinctrl support

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Date:	Mon, 14 Apr 2014 10:11:43 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>
CC:	Linus <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] pinctrl: add Intel BayTrail GPIO/pinctrl support

On 04/14/2014 02:52 AM, Mathias Nyman wrote:
>>
>
> This was the conclusion we reached after some discussion with Linus W.
> Initially this was just a GPIO driver, but Linus correctly spotted that
> Baytrail has many pinctrl-like features (like pin muxing, etc) that we
> might need to address in the future.
>
> threads where this was discussed:
>
> http://marc.info/?l=linux-kernel&m=136994203308585&w=2
> http://marc.info/?l=linux-kernel&m=137113578604763&w=2

So this is the interesting part:

> We expect BIOS to set all pin configurations correctly.

This device will only be used on an ACPI system, right?  And isn't ACPI 
supposed to hide all the pinctrl programming from the OS?  I thought 
that was the whole point behind ACPI and the reason why ARM64 isn't 
going to use device trees.

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, hosted by the Linux Foundation.
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