[PATCH v3 0/5] Introduce at91_adc8xx driver

From: Ludovic Desroches
Date: Thu Jan 14 2016 - 10:38:08 EST


This is the very basic support for the adc introduced with the SAMA5D2 SoC

The goal is to provide something to the user as soon as possible instead of
waiting for a full featured driver.

Only unsigned conversions on a software tigger are supported. Next steps are
signed conversions, differential channels, hardware triggers, dma support,
touchscreen support, and others.

- v3:
- Driver file renaming.
- Syntax cleanup.
- Sampling frequency accessed through read/write_raw.
- Cleanup in the IRQ handler.
- v2:
- Cleanup thanks to Peter Meerwald-Stadler comments (add prefix for macros,
remove useless stuff, etc).
- Move parameters relative to the SoC to the device tree (min/max sampling
rate and startup time).
- Use sysfs to configure the sampling frequency.
- vddana supply is no more optionnal.
- No change for irq since I am not sure it will simplify the code (interrupt
is cleared when reading channel conversion result). Jonathan, tell me if
I need to rework this part.

Ludovic Desroches (5):
iio:adc:at91_adc8xx: introduce new atmel adc driver
MAINTAINERS: add entry for Atmel ADC 8xx driver
ARM: at91/dt: sama5d2: add adc device
ARM: at91/dt: sama5d2 Xplained: enable the adc device
ARM: at91/defconfig: add sama5d2 adc support in sama5_defconfig

.../bindings/iio/adc/at91-sama5d2_adc.txt | 28 ++
arch/arm/boot/dts/at91-sama5d2_xplained.dts | 22 +
arch/arm/boot/dts/sama5d2.dtsi | 18 +-
arch/arm/configs/sama5_defconfig | 1 +
drivers/iio/adc/Kconfig | 11 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/at91-sama5d2_adc.c | 509 +++++++++++++++++++++
8 files changed, 590 insertions(+), 6 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/adc/at91-sama5d2_adc.txt
create mode 100644 drivers/iio/adc/at91-sama5d2_adc.c