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From: Hector Palacios <hector.palacios@digi.com>
To: <devicetree-discuss@lists.ozlabs.org>
Cc: "fabio.estevam@freescale.com" <fabio.estevam@freescale.com>,
	Marek Vasut <marex@denx.de>, Lars-Peter Clausen <lars@metafoo.de>,
	"jic23@kernel.org" <jic23@kernel.org>,
	Alexandre Belloni <alexandre.belloni@free-electrons.com>,
	"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>
Subject: Re: Reference voltages for ADC channels
Date: Fri, 12 Jul 2013 15:14:25 +0200	[thread overview]
Message-ID: <51E00131.7080909@digi.com> (raw)
In-Reply-To: <51DA588A.5050609@digi.com>

Hello,

On 07/08/2013 08:13 AM, Hector Palacios wrote:
> Greetings,
>
> The other day at linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org we discussed the
> possibility of having ADC channels voltage references moved to the DT [1].
>
> In Freescale's i.MX28 and i.MX23, at least, the CPU has 16 ADC channels some of which
> are dedicated to measure internal stuff, like CPU temperature and voltages. Some
> channels have different fixed divisors and so different reference voltages.
> These reference voltages (in mV) are needed to calculate the scale to show through the
> sysfs IIO interface, so that a user can easily compute the real measured voltage out
> of the sampled data.
>
> The proposed DT entry also appears at [1].
> We would love to here opinions about it.
>
> [1] http://www.spinics.net/lists/linux-iio/msg08973.html

Any opinion about the suggestion of moving ADC reference voltages into the device tree?

Thanks
-- 
Héctor Palacios

WARNING: multiple messages have this Message-ID (diff)
From: Hector Palacios <hector.palacios-i7dp0qKlBMg@public.gmane.org>
To: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
Cc: "fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org"
	<fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
	Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>,
	Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>,
	"jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
	<jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Alexandre Belloni
	<alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	"linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: Reference voltages for ADC channels
Date: Fri, 12 Jul 2013 15:14:25 +0200	[thread overview]
Message-ID: <51E00131.7080909@digi.com> (raw)
In-Reply-To: <51DA588A.5050609-i7dp0qKlBMg@public.gmane.org>

Hello,

On 07/08/2013 08:13 AM, Hector Palacios wrote:
> Greetings,
>
> The other day at linux-iio-u79uwXL29TY76Z2rM5mHXA-XMD5yJDbdMReXY1tMh2IBg@public.gmane.org we discussed the
> possibility of having ADC channels voltage references moved to the DT [1].
>
> In Freescale's i.MX28 and i.MX23, at least, the CPU has 16 ADC channels some of which
> are dedicated to measure internal stuff, like CPU temperature and voltages. Some
> channels have different fixed divisors and so different reference voltages.
> These reference voltages (in mV) are needed to calculate the scale to show through the
> sysfs IIO interface, so that a user can easily compute the real measured voltage out
> of the sampled data.
>
> The proposed DT entry also appears at [1].
> We would love to here opinions about it.
>
> [1] http://www.spinics.net/lists/linux-iio/msg08973.html

Any opinion about the suggestion of moving ADC reference voltages into the device tree?

Thanks
-- 
Héctor Palacios

  reply	other threads:[~2013-07-12 13:14 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-08  6:13 Reference voltages for ADC channels Hector Palacios
2013-07-08  6:13 ` Hector Palacios
2013-07-12 13:14 ` Hector Palacios [this message]
2013-07-12 13:14   ` Hector Palacios

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