linux-kernel - [PATCH v2 00/19] iio: adc: at91-sama5d2_adc: add support for temperature sensor

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Message-ID: <20220628151631.3116454-1-claudiu.beznea@microchip.com>
Date:   Tue, 28 Jun 2022 18:16:12 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <eugen.hristev@...rochip.com>, <jic23@...nel.org>,
        <lars@...afoo.de>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <claudiu.beznea@...rochip.com>,
        <robh+dt@...nel.org>, <krzk+dt@...nel.org>
CC:     <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v2 00/19] iio: adc: at91-sama5d2_adc: add support for temperature sensor

Hi,

The following series add support for temperature sensor available on
SAMA7G5.

Temperature sensor available on SAMA7G5 provides 2 outputs VTEMP and VBG.
VTEMP is proportional to the absolute temperature voltage and VBG is a
quasi-temperature independent voltage. Both are necessary in computing
the temperature (for better accuracy). Also, for better accuracy the
following settings were imposed when measusing the temperature:
oversampling rate of 256, sampling frequency of 10MHz, a startup time of
512 ticks, MR.tracktim=0xf, EMR.trackx=0x3.

For computing the temperature measured by ADC calibration data is
necessary. This is provided via OTP memory available on SAMA7G5.

Patches 1/19-4/19 provides some fixes.
Patches 5/19-16/19 prepares for the addition of temperature sensor
support.
Patch 17/16 adds the temperature sensor support.

Along with temperature sensor support I took the chance and added
runtime PM support in this series, too (handled in patch 19/19).

The rest of patches in this series are minor cleanups.

Thank you,
Claudiu Beznea

Changes in v2:
- addressed review comments
- with this, new patches were intruced in this series: 2/19, 4/19,
  8/19, 9,19
- runtime pm support has been adapted to work also when CONFIG_PM
  is not enabled
- collected tags

Claudiu Beznea (19):
  iio: adc: at91-sama5d2_adc: fix AT91_SAMA5D2_MR_TRACKTIM_MAX
  iio: adc: at91-sama5d2_adc: check return status for pressure and touch
  iio: adc: at91-sama5d2_adc: lock around oversampling and sample freq
  iio: adc: at91-sama5d2_adc: disable/prepare buffer on suspend/resume
  iio: adc: at91-sama5d2_adc: exit from write_raw() when buffers are
    enabled
  iio: adc: at91-sama5d2_adc: handle different EMR.OSR for different hw
    versions
  iio: adc: at91-sama5d2_adc: move the check of oversampling in its
    function
  iio: adc: at91-sama5d2_adc: drop AT91_OSR_XSAMPLES defines
  iio: adc: at91-sama5d2_adc: add .read_avail() chan_info ops
  iio: adc: at91-sama5d2_adc: adjust osr based on specific platform data
  iio: adc: at91-sama5d2_adc: add 64 and 256 oversampling ratio
  iio: adc: at91-sama5d2_adc: move oversampling storage in its function
  iio: adc: at91-sama5d2_adc: update trackx on emr
  iio: adc: at91-sama5d2_adc: add startup and tracktim as parameter for
    at91_adc_setup_samp_freq()
  iio: adc: at91-sama5d2_adc: lock around at91_adc_read_info_raw()
  dt-bindings: iio: adc: at91-sama5d2_adc: add id for temperature
    channel
  iio: adc: at91-sama5d2_adc: add support for temperature sensor
  iio: adc: at91-sama5d2_adc: add empty line after functions
  iio: adc: at91-sama5d2_adc: add runtime pm support

 drivers/iio/adc/at91-sama5d2_adc.c            | 683 +++++++++++++++---
 .../dt-bindings/iio/adc/at91-sama5d2_adc.h    |   3 +
 2 files changed, 566 insertions(+), 120 deletions(-)

-- 
2.34.1