Reference voltages for ADC channels

Reference voltages for ADC channels

[Hector Palacios]

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

Best regards,
--
Hector Palacios

Reference voltages for ADC channels

[Hector Palacios]

Greetings,

The other day at linux-iio@vger.kernel.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

Best regards,
--
Hector Palacios

Re: Reference voltages for ADC channels

[Hector Palacios]

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

Re: Reference voltages for ADC channels

[Hector Palacios]

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