linux-kernel - Re: [RFC PATCH] gpio: support for GPIO forwarding

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Message-ID: <20150224203459.GC13094@psi-dev26.jf.intel.com>
Date:	Tue, 24 Feb 2015 12:34:59 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC PATCH] gpio: support for GPIO forwarding

Hi,

> If we decide to go ahead with the solution proposed by this patch for
> practical reasons (which are good reasons indeed), I still have one
> problem with its current form.
> 
> As the discussion highlighted, this is an ACPI problem, so I'd very
> much like it to be confined to the ACPI GPIO code, to be enabled only
> when ACPI is, and to use function names that start with acpi_gpio. The
> current implementation leverages platform lookup, making said lookup
> less efficient in the process and bringing confusion about its
> purpose. Although the two processes are indeed similar, they are
> separate things: one is a legitimate way to map GPIOs, the other is a
> fixup for broken firmware.
> 
> I suppose we all agree this is a hackish fix, so let's confine it as
> much as we can.

Are we considering MFD cases hackish as well?
i.e. if we have a driver that needs to register children devices and this
driver needs to pass GPIO to a child.

Br, David
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