Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediagrafted

Pull media updates from Mauro Carvalho Chehab:

 - v4l2-core: added ISP statistics support and per-block validation

 - v4l2-core: Allow unknown HDR10 white point and luminance

 - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor

 - New codec: Milos: VPU v2.0 codec support

 - isp driver: gained support for Dreamchip RPPX1 ISP framework

 - vsp1 driver: gained support for RZ/T2H and RZ/N2H

 - Novalake driver: gained CVS support for new NVL hardware

 - dvb-core: fix feed leak on failed DMX_ADD_PID

 - several driver fixes, cleanups and minor improvements

* tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits)
  media: ipu-bridge: check all DMI entries when overriding sensor rotation
  media: v4l2-async: avoid deleting unlinked ASC entry on link error
  media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement
  media: intel/ipu6: fix async notifier cleanup leak on parse error
  media: staging/ipu7: fix async notifier UAF on probe error path
  media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
  media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
  media: rcar-isp: Fix VSPX reference leaks
  media: rcar-isp: Release ISPCORE resources
  media: i2c: imx415: Release runtime PM reference on VBLANK error
  media: i2c: imx415: Return test pattern write errors
  media: renesas: vsp1: Declare index variables in for loop statement
  media: renesas: vsp1: Make reset control optional to support platforms without a reset line
  media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs
  media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs
  media: nxp: imx8-isi: Add additional 32-bit RGB format support
  media: nxp: imx8-isi: Add 16-bit raw Bayer format support
  media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams
  media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks
  media: nxp: imx8-isi: Correct color map between V4L2 and ISI
  ...

1 files changed, 98 insertions, 0 deletions

diff --git a/Documentation/ABI/README b/Documentation/ABI/README
new file mode 100644
index 000000000..315fffe1f
--- /dev/null
+++ b/Documentation/ABI/README
@@ -0,0 +1,98 @@
+This part of the documentation inside Documentation/ABI directory
+attempts to document the ABI between the Linux kernel and
+userspace, and the relative stability of these interfaces.  Due to the
+everchanging nature of Linux, and the differing maturity levels, these
+interfaces should be used by userspace programs in different ways.
+
+We have four different levels of ABI stability, as shown by the four
+different subdirectories in this location.  Interfaces may change levels
+of stability according to the rules described below.
+
+The different levels of stability are:
+
+  stable/
+	This directory documents the interfaces that the developer has
+	defined to be stable.  Userspace programs are free to use these
+	interfaces with no restrictions, and backward compatibility for
+	them will be guaranteed for at least 2 years.  Most interfaces
+	(like syscalls) are expected to never change and always be
+	available.
+
+  testing/
+	This directory documents interfaces that are felt to be stable,
+	as the main development of this interface has been completed.
+	The interface can be changed to add new features, but the
+	current interface will not break by doing this, unless grave
+	errors or security problems are found in them.  Userspace
+	programs can start to rely on these interfaces, but they must be
+	aware of changes that can occur before these interfaces move to
+	be marked stable.  Programs that use these interfaces are
+	strongly encouraged to add their name to the description of
+	these interfaces, so that the kernel developers can easily
+	notify them if any changes occur (see the description of the
+	layout of the files below for details on how to do this.)
+
+  obsolete/
+	This directory documents interfaces that are still remaining in
+	the kernel, but are marked to be removed at some later point in
+	time.  The description of the interface will document the reason
+	why it is obsolete and when it can be expected to be removed.
+
+  removed/
+	This directory contains a list of the old interfaces that have
+	been removed from the kernel.
+
+Every file in these directories will contain the following information:
+
+What:		Short description of the interface
+Date:		Date created
+KernelVersion:	(Optional) Kernel version this feature first showed up in.
+		Note: git history often provides more accurate version
+		info, so this field may be omitted.
+Contact:	Primary contact for this interface (may be a mailing list)
+Description:	Long description of the interface and how to use it.
+Users:		All users of this interface who wish to be notified when
+		it changes.  This is very important for interfaces in
+		the "testing" stage, so that kernel developers can work
+		with userspace developers to ensure that things do not
+		break in ways that are unacceptable.  It is also
+		important to get feedback for these interfaces to make
+		sure they are working in a proper way and do not need to
+		be changed further.
+
+
+Note:
+   The fields should be use a simple notation, compatible with ReST markup.
+   Also, the file **should not** have a top-level index, like::
+
+	===
+	foo
+	===
+
+How things move between levels:
+
+Interfaces in stable may move to obsolete, as long as the proper
+notification is given.
+
+Interfaces may be removed from obsolete and the kernel as long as the
+documented amount of time has gone by.
+
+Interfaces in the testing state can move to the stable state when the
+developers feel they are finished.  They cannot be removed from the
+kernel tree without going through the obsolete state first.
+
+It's up to the developer to place their interfaces in the category they
+wish for it to start out in.
+
+
+Notable bits of non-ABI, which should not under any circumstances be considered
+stable:
+
+- Kconfig.  Userspace should not rely on the presence or absence of any
+  particular Kconfig symbol, in /proc/config.gz, in the copy of .config
+  commonly installed to /boot, or in any invocation of the kernel build
+  process.
+
+- Kernel-internal symbols.  Do not rely on the presence, absence, location, or
+  type of any kernel symbol, either in System.map files or the kernel binary
+  itself.  See Documentation/process/stable-api-nonsense.rst.