linux-kernel - Re: [PATCH v2 0/2] pinctrl: Intel Cherryview/Braswell support

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Date:	Tue, 04 Nov 2014 16:56:40 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Ning Li <ning.li@...el.com>, Alan Cox <alan@...ux.intel.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] pinctrl: Intel Cherryview/Braswell support

On 11/04/2014 05:13 PM, Rafael J. Wysocki wrote:
> Well, first of all, you won't use phandles with ACPI.:-)

Yes, which makes things complicated for me.  The pinctrl binding makes 
heavy use of phandles, so it will be a challenge to come up with a 
substitue.

> That seems to be the case in which some ACPI-specific code would need to be
> written.  In ACPI, instead of the list of phandles you'll have a list of
> references to device objects that you can walk in an analogous way.

Can you point me to an example Linux driver that parses references?

 >  I'm
> not sure how much of that code can be shared between DT and ACPI ATM, but
> it looks like at least some of it can be shared.

So ACPI does not support the concept if variable length properties?

> And it looks like we'll need a device_property_read_string_index().:-)

Multi-string properties are also very popular in device tree.

>
> BTW, where's the pinctrl binding documented?

Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

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