linux-dev/drivers/staging/iio, branch master

staging: iio: frequency: ad9832: Fix alignment for DMA safety

2022-08-20T11:54:43Z

____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. Whilst here, move the marking to cover the whole union. That has no functional affect, but makes it slightly easier to see what is going on. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220813160600.1157169-1-jic23@kernel.org

staging: iio: resolver: ad2s1210: Fix alignment for DMA safety

2022-08-15T21:30:02Z

____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. As the tx[] an rx[] buffers are only used in the same SPI exchanges, we should be safe with them on the same cacheline. Hence only mark the first one __aligned(IIO_DMA_MINALIGN). Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220807151218.656881-5-jic23@kernel.org

staging: iio: meter: ade7854: Fix alignment for DMA safety

2022-08-15T21:30:01Z

____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Cc: Rodrigo Siqueira Link: https://lore.kernel.org/r/20220807151218.656881-4-jic23@kernel.org

staging: iio: frequency: ad9834: Fix alignment for DMA safety

2022-08-15T21:30:01Z

____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_DMA_MINALIGN definition. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220807151218.656881-3-jic23@kernel.org

iio: cdc: ad7746: Move driver out of staging.

2022-08-15T21:30:01Z

All known major issues with this driver resolved so time to move it out of staging. This also allows us to remove the now empty staging/iio/cdc directory and build files. Note this cleanup work was done using the roadtest framework. https://lore.kernel.org/all/20220311162445.346685-1-vincent.whitchurch@axis.com/ Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko

staging: iio: ad7746: White space cleanup

2022-08-15T21:30:01Z

Tidy up some trivial whitespace issues. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220626122938.582107-15-jic23@kernel.org

staging: iio: cdc: ad7746: Use read_avail() rather than opencoding.

2022-08-15T21:30:01Z

Switch over to the IIO core handling for _available attributes making them available for in kernel users and enforcing correct naming etc automatically. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220626122938.582107-14-jic23@kernel.org

staging: iio: cdc: ad7746: Switch from _offset to _zeropoint for differential channels.

2022-08-15T21:30:01Z

As this offset is applied equally to both lines of the differential pair, _ofset should not be used. Use the new ABI _zeropoint instead to avoid userspace software applying this value when calculating real value = (_raw + _offset) * _scale Also add a comment to explain why an offset of 0x800000 is applied within the driver rather than exposed to userspace. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220626122938.582107-13-jic23@kernel.org

staging: iio: cdc: ad7746: Use _raw and _scale for temperature channels.

2022-08-15T21:30:00Z

Performing the maths to rescale a 24 bit raw reading within the driver was resulting in precision losses. So make that userspace's problem by exporting the scale and letting the maths be done in userspace with appropriate precision. Issue identified using roadtester testing framework. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220626122938.582107-11-jic23@kernel.org

staging: iio: cdc: ad7746: Drop unused i2c_set_clientdata()

2022-08-15T21:30:00Z

As the comment states, this was only used in remove() and now there is no explicit remove() function to make use of it. Signed-off-by: Jonathan Cameron Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220626122938.582107-10-jic23@kernel.org