From: Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
To: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Paul Cercueil
<paul.cercueil-OyLXuOCK7orQT0dZR+AlfA@public.gmane.org>
Cc: Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Michael Hennerich
<Michael.Hennerich-OyLXuOCK7orQT0dZR+AlfA@public.gmane.org>,
Hartmut Knaack <knaack.h-Mmb7MZpHnFY@public.gmane.org>,
Peter Meerwald <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCHv2 1/3] Documentation: ad5064: Added devicetree bindings documentation
Date: Tue, 13 Oct 2015 13:11:17 +0200 [thread overview]
Message-ID: <561CE6D5.2000400@metafoo.de> (raw)
In-Reply-To: <20151012151857.GC7452@leverpostej>
>> +
>> +Optional properties:
>> + - vref-supply: phandle to the external reference voltage supply.
>> + This should only be set if there is an external reference voltage
>> + connected to the vref or vref[A-D] pins.
>
> I don't understand. Surely the latter case means you're describing the
> same supply twice (as it should already be in vref*-supply)?
>
> What vref pins does the HW actually have?
Some off the devices supported by the binding have a shared reference for
all DAC outputs, while others have a separate reference for each output. In
addition to that some of them have an internal reference that can used, in
which case the external reference is optional, otherwise the external
reference is required. The bindings documentation should clarify on which
applies to which device.
prev parent reply other threads:[~2015-10-13 11:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 11:50 [PATCHv2 1/3] Documentation: ad5064: Added devicetree bindings documentation Paul Cercueil
[not found] ` <1444650634-12025-1-git-send-email-paul.cercueil-OyLXuOCK7orQT0dZR+AlfA@public.gmane.org>
2015-10-12 11:50 ` [PATCHv2 2/3] iio: ad5064: Explicitly configure whether to use external supply Paul Cercueil
2015-10-12 11:50 ` [PATCHv2 3/3] iio: ad5064: Always use external vref if there is no internal vref Paul Cercueil
2015-10-12 15:18 ` [PATCHv2 1/3] Documentation: ad5064: Added devicetree bindings documentation Mark Rutland
2015-10-13 11:11 ` Lars-Peter Clausen [this message]
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