regmap: add support for regmap_init_mmio_clk ...

regmap-mmio is used in Linux for clocked memory mapped I/O regions.
Port it over, so we can more easily port drivers using it.

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

regmap: make internal.h a self-contained header ...

Follow up commit will add a new user for "internal.h".
Prepare the header for this.

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

Merge branch 'for-next/misc'

driver: Call of_clk_set_defaults for each probed device ...

So far we only honour the assigned-clocks and assigned-clock-rates
device tree properties for the clock controller nodes. With this patch
we also honour the properties for each device which is done by Linux
as well.

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

driver: bail out, don't crash, if drv->name is not set ...

Currently, we expect each driver to have a name. If a driver doesn't,
we run into a NULL pointer dereference. Make this error scenario more
pleasant by checking if a name is set and failing otherwise.

The only in-tree driver affected by this is drivers/watchdog/dw_wdt.c,
which will be fixed in the follow-up commit.

Affected drivers can be determined with following pipeline, which should
return all driver_d structure instantiations that don't contain a name:

  ack --A 4 'struct driver_d.*' | perl -pe 's/^--$/\n/' | \
	perl -000 -ne 'print if /=.*\{.*\}/s && !/name/s'

With this change, these drivers should now give a more pleasant message:

  ERROR: initcall dw_wdt_driver_register+0x1/0xc failed: Invalid argument

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

regmap: align documentation in comment with code ...

dev_get_regmap has some copy-paste left-over in the comment.
Rectify this.

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

drivers: Drop dummy_probe() ...

Drop dummy_probe() due to lack of users in the tree.

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

Merge branch 'for-next/lseek'

devfs: Drop dev_lseek_default() ...

Only the following cdevs do not declare an .lseek() operation:

  - Console devices in common/console.c
  - Firmware framework in common/firmware.c
  - JTAG driver in drivers/misc/jtag.c
  - UBI in drivers/mtd/ubi/barebox.c

Of those four, first two are marked DEVFS_IS_CHARACTER_DEV and
implement only .write() operation and the last two don't implement
anything but .ioctl(). While there's probably no meaningful way to use
lseek() against any of those devices, there doesn't seem to be any
harm in allowing it either.

Change devfs_lseek() to ignore absense of .lseek() callback and drop
dev_lseek_default() and all references to it in the codebase.

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

drivers: base: Port power management code from Linux ...

Port an extremely abridged version of power management/power domain
code from Linux as a dependency of i.MX7D PCIe work. Currenlty only
bare minimum of functionality is implemented.

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

base: driver: Drop redundant list_empty() check ...

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

driver: Print message with pr_err ...

print "already registered" message with pr_err() rather than printf() to
make sure it also appears in the logs.

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

Merge branch 'for-next/net-switch-mv88e6xxx'

drivers: base: Simplify dev_request_mem_region_err_null() ...

Simplify dev_request_mem_region_err_null() by making use of
dev_request_mem_resource() to implement it.

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

drivers: base: Drop dev_get_mem_region_by_name() ...

Drop dev_get_mem_region_by_name() which doesn't seem to have any users
in the codebase.

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

drivers: base: Simplify generic_memmap_ro() ...

Simplify generic_memmap_ro() by re-implementing it using
generic_memmap_rw().

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

drivers: base: Convert device_d name to be dynamically allocated ...

Convert device_d name to be dynamically allocated in order to lift
MAX_DRIVER_NAME length limit needed for commits that follow.

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

base: Don't use shared buffer for results of dev_id() ...

Using shared memory buffer to return results of dev_id() leads to
incorrect results when used as follows:

    dev_info(..., "... %s ...\n", ..., dev_name(foo), ...);

since result returned for dev_name(foo) will be overwritten by
dev_name() call that will happen as a part of dev_* logging functions.

To prevent that allocate a dedicated field "unique_name" in struct
device_d and use it to store unique name returned by
dev_id()/dev_name().

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

drivers: Introduce dev_set_name() ...

Introduce dev_set_name() in order to hide implementation details of
setting device's name so it'd be easier to change it.

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

rename file_operations -> cdev_operations ...

Linux also has struct file_operations which are something different.
Rename our file_operations to cdev_operations which better matches
what we have.

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

driver: Add device_detect_all() function ...

Add a device_detect_all function to detect all devices and use it
in the detect command. This makes the functionality reusable in other
code.

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

regmap: port regmap_update_bits from linux ...

Port the regmap_update_bits function from linux v4.14-rc1 to barebox.

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

fs: devfs-core: replace DEVFS_IS_PARTITION flag with pointer to the master cdev ...

Instead of having a flag indicating a cdev is a partition on
some master cdev, just add a master pointer to the cdev, so
that we can also find out who the master is.

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

regmap: Add regmap_write_bits() function ...

Add code implementing a simple version of regmap_write_bits().

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

driver: Introduce dev_request_mem_resource ...

dev_request_mem_region returns a void * which shall be checked with
IS_ERR(), but in some cases the valid pointer returned clashes with
error values. This is especially the case on some Atmel SoCs.

This introduces dev_request_mem_resource which returns a struct resource
instead which in any case can be checked with IS_ERR(). It's the drivers
responsibility then to get the IOMEM pointer from the resource.

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

driver: Fix unregister device after device probe failure ...

When a device probe fails the device is removed from the active list.
If then the device is unregistered afterwards it is removed from the
active list again resulting in a crash. To fix this initialize the
devices active list entry when removing it from the active list.

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

Add initial regmap support ...

This adds initial regmap support. Function prototypes are from
the Kernel, the implemention is mostly rewritten. Currently the
regmap support is limited to the bare minimum to get started.

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

Merge branch 'for-next/mips'

drivers: bus: Match against id_table first ...

Matching against driver's name before looking throught its id_table
can lead to a somewhat strange and unintuitive behaviour where a
device whose driver's name matches one of the lines in id_table (which
is not unheard of in Linux kernel) will be probed against said driver
with 'id_table' field set to NULL which in turn will result in
dev_get_drvdata erroring out with -ENODEV.

This patch changes the behaviour such that device_match() only tries
to match against driver's name only if id_table of that driver is not
present.

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

driver: make all dev_request_mem_region_* routines MIPS compatible ...

Use IOMEM() macro in all dev_request_mem_region_* routines to allow
the proper mapping on all platforms.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>