[PATCHv2 0/3] Add support for the Nuvoton NAU7802 ADC to the cfa10049

From: Alexandre Belloni
Date: Thu Jun 20 2013 - 14:58:17 EST


Sorry for the delay, this is v2 of the patchset that adds support for the 3
Nuvoton NAU7802 ADCs present on the CFA-10049 board from Crystalfontz. The first
patch adds the driver, the next ones are adding them in the DT after switching
the second i2c bus to bitbanging following a lot of timeout issues we have on
that bus.

Since v1, I've taken into account the review from Jonathan Cameron, Lars-Peter
Clausen and Maxime Ripard:
- channels are now statically allocated
- no wrappers around i2c functions
- sampling_freq is a shared attribute
- setting gain is done through scale
- cosmetics changes (s/idev/indio_dev/, blank lines before returns)
- use of sign_extend32 to extend the sign
- reading scale now returns IIO_VAL_FRACTIONAL_LOG2
- no dt lookup for interrupts, this is done in of_i2c.c but that was mask due
to a bug.

what I didn't address is setting the external reference voltage through a fixed
regulator and I kept the vldo attribute to set the internal voltage reference in
the DT as Jonathan seemed to be ok with that. If anybody is using a nau7802 with
an external reference, it will still be time to add the fixed regulator. It
shouldn't be difficult but I don't have any hardware to test.


Alexandre Belloni (1):
iio: Add Nuvoton NAU7802 ADC driver

Maxime Ripard (2):
ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging
ARM: mxs: cfa10049: Add NAU7802 ADCs to the device tree

.../bindings/iio/adc/nuvoton-nau7802.txt | 17 +
arch/arm/boot/dts/imx28-cfa10049.dts | 126 +++--
drivers/iio/adc/Kconfig | 9 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/nau7802.c | 603 +++++++++++++++++++++
5 files changed, 713 insertions(+), 43 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton-nau7802.txt
create mode 100644 drivers/iio/adc/nau7802.c


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