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>

startup: rename AUTOBOOT_UNKNOWN to more descriptive AUTOBOOT_COUNTDOWN ...

If we export the autoboot state variable for customization, having
unknown as default is not so helpful. Rename it to what actually happens
(abortable countdown).

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/zii'

Merge branch 'for-next/usb'

Merge branch 'for-next/spi'

Merge branch 'for-next/pwm'

Merge branch 'for-next/net'

Merge branch 'for-next/misc'

clk: at91: port Linux v5.6 SAM9X60 (new ARM926EJ-S) clock support ...

During a bug hunt that ultimately turned out unrelated to the state
of the barebox at91 clk driver, I synchronized its state with Linux v5.6.

Bug fixes and clean up to minimize the diff were split out in separate
prior commits.  This last commit imports the rest, which is basically
support for Microchip's new ARM926EJ-S SoC, the SAM9x60.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: at91: add sama5d2 audio PLL support ...

Commit 7310b976 ("clk: at91: fix compilation errors in sama5d2.c") and
follow-up commit ca3077068c ("clk: at91: delete dead i2s/audio code")
had deleted the i2s/audio clock related parts of the upstream driver.

This was mostly due to unwillingness on my part to understand the code
enough for porting them and because I deemed them unnecessary to support
in barebox. The former has changed and the latter is not totally true as
audio PLL derived clocks may be muxed as inputs for programmable and
generated clocks.

Port them over and mimize the diff to upstream.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: migrate to SPDX-License-Identifier use ...

Some of these are a product of source sync with Linux, the other were
done with macro assistance by searching for /later/, deleting license text,
adding appropriate SPDX-License-Identifier and manual post-review.

Devices without a license indicated where assumed GPL-2.0-only according
with the project's license.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

include: linux/kernel.h: port DIV_ROUND_CLOSEST_ULL definition ...

We already have DIV_ROUND_CLOSEST, but no DIV_ROUND_CLOSEST_ULL.
Import the latter for use by later commits.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: add clk_unregister stub ...

Make kernel clk driver import a tiny bit more convenient by allowing
clk_unregister calls and control flow to remain as is.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: implement clk_register_fixed_rate ...

We lack a way to instantiate a fixed clock while specifying a parent.
This is used in the at91 clock code sync with upstream in a later
commit, so prepare by porting clk_register_fixed_rate.

It's based on the Linux commit of the same name with the difference that
it doesn't use (and thus doesn't require) a struct device_d * as first
parameter.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: port Linux of_get_compatible_child helper ...

Incoming Linux code port makes use of the helper. Add it now instead of
having to open-code it later.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

libfdt: update <linux/libfdt.h> and <linux/libfdt_env.h> to Linux 5.7-rc1 ...

Fix the relative include path in <linux/libfdt.h>

Including <linux/kernel.h> is too much. <linux/limits.h> is enough
for INT_MAX.

Define INT32_MAX and UINT32_MAX in the same way as Linux does.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: include: remove unused <asm/processor.h> ...

File has been in source tree for 17 years and is unused.
Drop it. The only definition we might want out of the file is
cpu_relax(), which we already open code as barrier() with a comment in a
couple of places. Move the definition to <linux/barebox-wrapper.h>
and drop the file altogether.

No functional change.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

regmap: retire of_node_to_regmap in favor of device_node_to_regmap ...

device_node_to_regmap is the current upstream API for this and is more
general, because it allocates a regmap on demand if none exists.

As of_node_to_regmap is unused anywhere, remove it.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mfd: syscon: implement device_node_to_regmap ...

Extend our syscon API with a device_node_to_regmap function that has the
same semantics as upstream:

 __________________________________________________________________________
| Linux commit 39233b7
| CommitDate: Thu Aug 8 15:30:07 2019 -0700
|
| mfd/syscon: Add device_node_to_regmap()
|
| device_node_to_regmap() is exactly like syscon_node_to_regmap(), but it
| does not check that the node is compatible with "syscon", and won't
| attach the first clock it finds to the regmap.
|
| The rationale behind this, is that one device node with a standard
| compatible string "foo,bar" can be covered by multiple drivers sharing a
| regmap, or by a single driver doing all the job without a regmap, but
| these are implementation details which shouldn't reflect on the
| devicetree.
|
| Signed-off-by: Paul Cercueil <paul@crapouillou.net>
| Acked-by: Arnd Bergmann <arnd@arndb.de>
| Signed-off-by: Paul Burton <paul.burton@mips.com>
|__________________________________________________________________________

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

spi: validate spi messages ...

This adds __spi_validate() to validate spi messages. This function is a
stripped down version from the Kernel. The motivation for adding this
was to fill in xfer->bits_per_word from spi->bits_per_word so that a
spi bus driver can use the former.

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

regmap-mmio: Add big endian support ...

Add support for parsing the big-endian device tree property.

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

i2c: Port of_find_i2c_device_by_node() from Linux ...

Port of_find_i2c_device_by_node() from Linux in order to allow looking
i2c_client up by corresponding DT node. Useful for interacting with
identical raw/driverless I2C devices that are not found on the same
bus between board variants.

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

net: phy: Add missing inline to function ...

Add missing inline to static inline no-op wrapper function.

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

regulator: void function returns void ...

Do not return a value from a function returning void.

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

net: Add ifdown support and command ...

ifdown is the counterpart to ifup and disables one or all ethernet
interfaces.

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

net: Open ethernet devices explicitly ...

Open ethernet devices explicitly rather than implicitly when sending
packets. This allows us to not only enable, but in the next step to
also disable ethernet devices.

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

PWM: add support for STM32 ...

This driver adds support for PWM driver on STM32 platform
based on the Linux v5.4 support.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: introduce of_property_count_elems_of_size ...

Import the Linux helper, so code using it may be more easily ported.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

PWM: core: add apply API support for polarity ...

Some PWM chips support outputting an inverted PWM signal.
Add API support for this.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

PWM: core: apply initial state in of_pwm_request ...

This functions prepares a state that can later be tweaked and applied
to the PWM device with pwm_apply_state(). This is a convenient function
that first retrieves the current PWM state and the replaces the period
with the reference values defined in pwm->args.
Once the function returns, you can adjust the ->enabled and ->duty_cycle
fields according to your needs before calling pwm_apply_state().

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>