treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: of_path: fix return in case of EPROBE_DEFER ...

As said in commit 82eb3dff10 ("of_path: handle no driver for device")
this case happens if the driver isn't probed yet. So we should return
-EPROBE_DEFER to signal that.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers: of: Make use of devpath_to_name() ...

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: of_path: find device via partuuid ...

When a node is compatible to a fixed-partitions, support searching the
corresponding device via the partuuid, if it specified in the device tree.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

of: of_find_node_by_devpath: Fix offset in mtd devices ...

When a cdev is a mtd device the partition offset must be used from
there, not from the cdev.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: of_path: add of_find_node_by_devpath() ...

We already have of_find_path_by_node() which finds a device path
for a given device node. This is used by the state framework to
find its backend path. This path has to be translated back to
a device node when Linux is started. The current approach turned
out to be too simple: We assumed that the node path is the same
in the tree Linux is started with. This is not true in several
cases:
- partition nodes should have the name "partition@<offset>", but
  in several trees they have "partition@<num>"
- There are two different partition bindings: The legacy binding
  and the new one with an additional partitions subnode which has
  a compatible = "fixed-partitions" property.
The node path only stays the same when the internal tree uses the
same bindings and node names as the tree Linux is started with.

To overcome this limitation we create of_find_node_by_devpath()
which converts the device path back to a device node. It does
so by finding the device node of the hardware device rather than
the partition node. It then parses over the partitions in this
device node with the known bindings looking for a partition which
matches in offset and size to the barebox partition.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: only handle no driver for device if it is on a bus ...

This fixes a regression in __of_find_path() for flash devices created by
the cadence-quadspi driver, which do not have 'dev->driver' set.  Such
devices do not have 'dev->bus' set either, so we can use that to qualify
the existing test.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/state'

of: of_find_path: Add support for new partition binding ...

The partitions now may be in a subnode of the actual device node.
Eventually go another step up in the hierarchy if required.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: handle no driver for device ...

in __of_find_path it can happen that there is a device, but there
is no driver for this device because it hasn't been probed yet.
Return -ENODEV in this case to let the caller know that it has to
try later again.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

string: Fix (v)asprintf prototypes ...

Our asprintf and vasprintf have different prototypes than the glibc
functions. This causes trouble when we want to share barebox code
with userspace code. Change the prototypes for (v)asprintf to match
the glibc prototypes. Since the current (v)asprintf are convenient
to use change the existing functions to b(v)asprintf.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: Drop possible further extensions of device-path property ...

Originally it was intended to further extend the multi string property
device-path further with more elements, like for example a filename. It
turned out though that this is too complex and instead of further
extending the property we should instead create additional properties,
so this mechanism is removed with this patch to make the code simpler.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: Fix bug with partitions, simply code ...

In commit 75b6827 using a path that
has a partition description broke.

Fix this and simpfy the code some.

There is no need to loop over each string in the path property:  it's
defined to have at most one parition description, no extant dts has
more than one, and how it would handle more than one didn't make sense
anyway.

Once not looping, __of_find_path() just needs the partition
description text, not both the original node and property name to look
it up from.

When using a partition description, don't lookup the cdev of the node
just to replace it with the partition's cdev.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: add of_find_path_by_node() ...

This patch adds the function of_find_path_by_node(), which is similar to
of_find_path(), but it translates a device tree node into a barebox device path
directly.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: of_find_path() factor out device detection logic into separate function ...

This patch factors out the device detection logic into separate function, so
that it can be used from another function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: Allow pointing directly to the partition ...

We could only point to partitions in the device tree by using
&norflash, "partname:barebox-environment". Allow to point to the
partition directly without having to parse the partition labels.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: of_find_path(): add possibility to return .bb device ...

This patch adds a flags argument to the of_find_path() function. The only flag
defined for now is OF_FIND_PATH_FLAGS_BB. When used on NAND devices, the
function returns the bad block aware device (the ".bb" device).

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: of_find_path(): remove unused variable len ...

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Fix spelling: pathes -> paths ...

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of_path: Allow to specify path with phandle only ...

Instead of just allowing to specify an OF path with additional
partname: property allow to specify a phandle to the partition
directly.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: move of_find_device_by_node_path to drivers/of/of_path.c ...

As it's generic helper function which should not stay in driver
specific code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add configurability via devicetree ...

This adds the possibility to configure the place for the environment
from the devicetree and to partition devices from the devicetree.

Configuration has the general form of devices with a regular compatible
property. This allows to later add additional drivers or drivers with
different behaviour (for example to add support for redundant environment).

The configuration is all in the /chosen/barebox/ hierarchy of the
devicetree. This separates the configuration from the hardware
description. Also it makes it possible to store the configuration
in a completely separate devicetree (or devicetree overlay). For
the same reason all configuration is done using nodepathes rather
than phandles.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>