Merge branch 'for-next/spi'

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>

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>

regmap-mmio: Add missing pieces for 64bit support ...

The 64bit accessor functions are present, but unused. Hook them up when
needed.

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

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>

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>

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>

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>

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>

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>

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>