For v1 of the patch see [1]. A summary of this patch: 1. Clean up of minor code style issues 2. Replace legacy GPIO ABI with modern ABI 4. Add scaling factor for angular position and angular velocity to match the sysfs IIO ABI 5. Add documentation for device tree binding, and angle channel 6. Move driver to main line Changes in v2: - Removed an unneeded include - Instead of using inclination channel for the angular position, use angle channel - Added documentation for device tree binding, and sysfs IIO ABI documentation for angle channel For the scaling factors, a fractional approximation of Pi is needed. As in v1 of the patch, the fraction 103993 / 33102 was chosen, which is based on the OEIS series of nominator/denominator of convergents to Pi (A002485 and A002486). I have looked at the implementation of iio_read_channel_info, and compared using the fraction above, with the fraction and offset used in the IIO_DEGREE_TO_RAD in iio.h, and found the first method to be more accurate for all possible 12-bit values, as the error is neglible. Also it does not cause overflow. In [2] Jonathan suggested to remove usage of platform data altogether, and asked for Michael Hennerich opinion. Since Michael didn't weigh in, I have left this how it was. Best regards, David Veenstra [1] https://marc.info/?l=linux-iio&m=152137920426820&w=2 [2] https://marc.info/?l=linux-iio&m=152181140619243&w=2 David Veenstra (13): staging: iio: ad2s1200: Remove unneeded include staging: iio: ad2s1200: Sort includes alphabetically staging: iio: ad2s1200: Reverse Christmas tree ordering staging: iio: ad2s1200: Add blank lines staging: iio: ad2s1200: Add kernel docs to driver state staging: iio: ad2s1200: Introduce variable for repeated value staging: iio: ad2s1200: Improve readability with be16_to_cpup staging: iio: ad2s1200: Replace legacy gpio API with modern API staging: iio: ad2s1200: Add documentation for device tree binding staging: iio: ad2s1200: Add scaling factor for angular velocity channel staging: iio: Documentation: Add missing sysfs docs for angle channel staging: iio: ad2s1200: Add scaling factor for angle channel staging: iio: ad2s1200: Move driver out of staging Documentation/ABI/testing/sysfs-bus-iio | 11 + .../devicetree/bindings/iio/resolver/ad2s1200.txt | 16 ++ drivers/iio/Kconfig | 1 + drivers/iio/Makefile | 1 + drivers/iio/resolver/Kconfig | 17 ++ drivers/iio/resolver/Makefile | 5 + drivers/iio/resolver/ad2s1200.c | 250 +++++++++++++++++++++ drivers/staging/iio/resolver/Kconfig | 12 - drivers/staging/iio/resolver/Makefile | 1 - drivers/staging/iio/resolver/ad2s1200.c | 165 -------------- 10 files changed, 301 insertions(+), 178 deletions(-) create mode 100644 Documentation/devicetree/bindings/iio/resolver/ad2s1200.txt create mode 100644 drivers/iio/resolver/Kconfig create mode 100644 drivers/iio/resolver/Makefile create mode 100644 drivers/iio/resolver/ad2s1200.c delete mode 100644 drivers/staging/iio/resolver/ad2s1200.c -- 2.16.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
