[PATCH v4] hwmon: ntc: Add DT with IIO support to NTC thermistor driver

[Doug Anderson]

Hi,

On Tue, Mar 12, 2013 at 9:08 PM, Naveen Krishna Chatradhi
<ch.naveen at samsung.com> wrote:
> This patch adds DT support to NTC driver to parse the
> platform data.
>
> Also adds the support to work as an iio device.
>
> During the probe ntc driver gets the respective channels of ADC
> and uses iio_raw_read calls to get the ADC converted value.
>
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen at samsung.com>
> ---
> Changes since v3:
> 1. Added a NULL check before iio_channel_release
> 2. Modified a return statement
>
> Guenter Roeck, Its wonderful working with you. Thanks.
>
>  .../devicetree/bindings/hwmon/ntc_thermistor.txt   |   29 ++++
>  drivers/hwmon/Kconfig                              |    1 +
>  drivers/hwmon/ntc_thermistor.c                     |  145 +++++++++++++++++---
>  include/linux/platform_data/ntc_thermistor.h       |    8 +-
>  4 files changed, 163 insertions(+), 20 deletions(-)

I haven't done a full review of this code, but it I built it in (along
with other CLs to enable it on exynos5250-snow) and the thermistors
are accessible and report reasonable values.

localhost hwmon # grep "" /sys/class/hwmon/*/device/temp1_input
/sys/class/hwmon/hwmon0/device/temp1_input:37890
/sys/class/hwmon/hwmon1/device/temp1_input:38393
/sys/class/hwmon/hwmon2/device/temp1_input:37148
/sys/class/hwmon/hwmon3/device/temp1_input:38059

Tested-by: Doug Anderson <dianders at chromium.org>