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Eugen Hristev 91b4e487b0 media: microchip: add ISC driver as Microchip ISC
The Atmel ISC driver will be moved to staging to support old users that
are not using the media controller paradigm.
The ISC driver was converted to media controller in the public patch
series:

https://lore.kernel.org/lkml/20220503095127.48710-1-eugen.hristev@microchip.com/T/#m2c320fa8153c01379a1c35b1d90a00903949513a

However the conversion cannot be done directly as it would affect existing
users by breaking the old way of configuration for sama5d2 platforms.

After discussions with the media maintainers, the decision is to move
Atmel ISC to staging as-is, to keep the Kconfig symbols and the users
to the driver in staging. Thus, all the existing users of the non
media-controller paradigm will continue to be happy and use the old config
way.

The converted driver would support both sama5d2 and sama7g5 platforms with
media controller paradigm, but it requires userspace configuration of the
pipeline for all the pipeline modules.

In a simple configuration sensor ==> isc , the old isc driver used to call
subdev s_fmt and control the sensor directly.
This was achieved by having a lot of code inside the driver that was
querying the subdev at probe time and made a list of formats which are
usable.
Basically the user had nothing to configure, as the isc would handle
everything at the top level. This was an easy way to capture, but also came
with the drawback of lack of flexibility.
In a more complicated pipeline
 sensor ==> controller 1 ==> controller 2 ==> isc
this would not be achievable, as controller 1 and controller 2 might be
media-controller configurable, and will not propagate the formats down to
the sensor.
The new driver Microchip ISC would solve all these problems and exposes pads
entities and links to userspace.
For the ease of tracking, the patches that convert to media controller come
on top of this patch that simply readds the driver to the new location under
the new Kconfig symbols.

To differentiate between the old driver and the new driver, I have renamed
the new driver to Microchip ISC, renaming the Kconfig symbols as well, and
all the mentions inside the driver.
The only thing that remains common is the file
include/linux/atmel-isc-media.h which is the ABI for the v4l2 custom
controls that the ISC exposes.
This file is used by both driver, so I kept it as-is.
To further avoid confusion all files have been renamed and all functions
named isc_* as well.
The exported symbols have been renamed with added microchip_ prefix, to
avoid symbol duplication with the old driver, and to avoid confusion.
Other than that, I have fixed small checkpatch issues when readding the
driver.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
2022-11-25 07:45:08 +00:00
arch media: arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Drop clock-names property 2022-11-25 06:47:07 +00:00
block block-6.1-2022-11-05 2022-11-05 09:02:28 -07:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto treewide: use get_random_bytes() when possible 2022-10-11 17:42:58 -06:00
Documentation media: admin-guide: cec.rst 2022-11-25 07:39:21 +00:00
drivers media: microchip: add ISC driver as Microchip ISC 2022-11-25 07:45:08 +00:00
fs Fix a number of bug fixes, including some regressions, the most 2022-11-06 10:30:29 -08:00
include media: vb2: add (un)prepare_streaming queue ops 2022-11-25 07:39:46 +00:00
init init: Kconfig: fix spelling mistake "satify" -> "satisfy" 2022-10-20 21:27:22 -07:00
io_uring io_uring: unlock if __io_run_local_work locked inside 2022-10-27 09:52:12 -06:00
ipc ipc/msg.c: fix percpu_counter use after free 2022-10-28 13:37:22 -07:00
kernel - Add Cooper Lake's stepping to the PEBS guest/host events isolation 2022-11-06 12:41:32 -08:00
lib Networking fixes for 6.1-rc4, including fixes from bluetooth and 2022-11-03 10:51:59 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mmap: fix remap_file_pages() regression 2022-10-28 13:37:23 -07:00
net Networking fixes for 6.1-rc4, including fixes from bluetooth and 2022-11-03 10:51:59 -07:00
rust Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
samples VFIO updates for v6.1-rc1 2022-10-12 14:46:48 -07:00
scripts kconfig: fix segmentation fault in menuconfig search 2022-11-02 17:32:05 +09:00
security lsm/stable-6.1 PR 20221031 2022-10-31 12:09:42 -07:00
sound ALSA: aoa: Fix I2S device accounting 2022-10-27 08:53:08 +02:00
tools cxl fixes for 6.1-rc4 2022-11-06 13:09:52 -08:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt Merge tag 'kvmarm-fixes-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD 2022-11-06 03:30:49 -05:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap mailmap: update email for Qais Yousef 2022-10-20 21:27:21 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS media: microchip: add ISC driver as Microchip ISC 2022-11-25 07:45:08 +00:00
Makefile Linux 6.1-rc4 2022-11-06 15:07:11 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.