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

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Date:	Fri, 25 Apr 2014 11:31:49 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Westerberg, Mika" <mika.westerberg@...el.com>
CC:	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Linus <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	lkml <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v3 1/1] pinctrl: add Intel BayTrail GPIO/pinctrl support

Rafael J. Wysocki wrote:
>>
>
> I would be interested in understanding what exactly the flow is in that
> situation, so care to educate me?  What does the driver do to trigger
> this and what exactly does happen in response to that?

I only just learned some of this myself, so I'm no expert.  My 
understanding is that the all of the pinctrl-* properties and nodes are 
scanned by the pinctrl layer itself.  So you could have a SATA 
controller node that points to a pin control node (via phandles).  When 
the SATA driver is probed, the pinctrl layer notices the phandles and 
automatically calls the pinctrl layer to configure the pins and pin muxes.

-- 
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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