mfd: syscon: Decouple syscon interface from platform devices

Currently a syscon entity can be only registered directly through a
platform device that binds to a dedicated syscon driver. However in
certain use cases it is desirable to make a device used with another
driver a syscon interface provider.

For example, certain SoCs (e.g. Exynos) contain system controller
blocks which perform various functions such as power domain control,
CPU power management, low power mode control, but in addition contain
certain IP integration glue, such as various signal masks,
coprocessor power control, etc. In such case, there is a need to have
a dedicated driver for such system controller but also share registers
with other drivers. The latter is where the syscon interface is helpful.

In case of DT based platforms, this patch decouples syscon object from
syscon platform driver, and allows to create syscon objects first time
when it is required by calling of syscon_regmap_lookup_by APIs and keep
a list of such syscon objects along with syscon provider device_nodes
and regmap handles.

For non-DT based platforms, this patch keeps syscon platform driver
structure where is can be probed and such non-DT based drivers can use
syscon_regmap_lookup_by_pdev API and get access to regmap handles.
Once all users of "syscon_regmap_lookup_by_pdev" migrated to DT based,
we can completly remove platform driver of syscon, and keep only helper
functions to get regmap handles.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Tomasz Figa <tomasz.figa@gmail.com>
Tested-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
clk: add lpc18xx creg clk driver

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
ARM: dts: add clock data to lpc18xx DT

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
gpio: add lpc18xx gpio driver

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
pinctrl: add lpc18xx pinctrl driver

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
rtc-lpc24xx: rework

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
rtc-lpc24xx: add dt support for lpc1850-rtc

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
lpc2k_wdt: rework

Compiles but the entire driver should be changed over to the new
watchdog driver api. So the driver is in for what looks more or
less like a total rewrite...

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
i2c-lpc2k: rework

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
net: ethernet: add stmac glue for lpc18xx ethernet

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
lpc4357-ea4357.dts: more eth dt stuff

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
reset: add driver for lpc18xx rgu

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
usb: echi: add driver for lpc18xx

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
usb: phy-generic: export otg set host/peripheral functions

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
usb: phy: add support for lpc18xx phy

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
lpc18xx-cgu: get base clk names from dt

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
arm: kbuild: make uImage entry an odd number on ARMv7-M

This allows U-Boot to branch to the kernel in Thumb mode on ARMv7M
CPUs that doesn't support ARM mode.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
ARM: zImage: add support for ARMv7-M

This patch makes it possible to enter zImage in Thumb mode for ARMv7M
(Cortex-M) CPUs that does not support ARM mode. The kernel entry is
also made in Thumb mode.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
phy-lpc18xx: add support for syscon phy control

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
dwmac-lpc18xx: support eth mode through syscon setting

Signed-off-by: Joachim Eastwood <manabian@gmail.com>