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

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Date:	Wed, 05 Nov 2014 22:04:38 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Timur Tabi <timur@...eaurora.org>
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 Tuesday, November 04, 2014 05:18:47 PM Timur Tabi wrote:
> On 11/04/2014 04:56 PM, Timur Tabi wrote:
> >
> >  >  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?
> 
> Ah, I see that it does:
> 
> int acpi_dev_prop_read_array(struct acpi_device *adev, const char *propname,
> 			     enum dev_prop_type proptype, void *val,
> 			     size_t nval)
> {
> ...
> 	if (!val)
> 		return obj->package.count;
> 
> 
> If I pass NULL for 'val', it returns the number of items.

Yes, it does that.

If you pass NULL for val to device_property_read_*_array(), it will also
return the number of items in the property.  Including the string one.

We're missing a couple of calls that you'd need for pinctrl, but I'd rather
add those along with some users.

Rafael

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