linux/Documentation/driver-api/media/v4l2-cci.rst

.. SPDX-License-Identifier: GPL-2.0

V4L2 CCI kAPI
^^^^^^^^^^^^^
.. kernel-doc:: include/media/v4l2-cci.h
media: Add MIPI CCI register access helper functions The CSI2 specification specifies a standard method to access camera sensor registers called "Camera Control Interface (CCI)". This uses either 8 or 16 bit (big-endian wire order) register addresses and supports 8, 16, 24 or 32 bit (big-endian wire order) register widths. Currently a lot of Linux camera sensor drivers all have their own custom helpers for this, often copy and pasted from other drivers. Add a set of generic helpers for this so that all sensor drivers can switch to a single common implementation. These helpers take an extra optional "int *err" function parameter, this can be used to chain a bunch of register accesses together with only a single error check at the end, rather than needing to error check each individual register access. The first failing call will set the contents of err to a non 0 value and all other calls will then become no-ops. Link: https://lore.kernel.org/linux-media/59aefa7f-7bf9-6736-6040-39551329cd0a@redhat.com/ Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Tommaso Merciai <tomm.merciai@gmail.com> Reviewed-by: Tommaso Merciai <tomm.merciai@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org> 2023-06-27 14:51:04 +02:00			`.. SPDX-License-Identifier: GPL-2.0`

			`V4L2 CCI kAPI`
			`^^^^^^^^^^^^^`
			`.. kernel-doc:: include/media/v4l2-cci.h`