The RK818 PMIC contains a charger. Add very basic charger functionality
to be able to regulate the USB input current and charger shutdown limits.
Signed-off-by: NWadim Egorov <w.egorov@phytec.de>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

Since this driver can be used for rk8xx series pmic,
let's rename rk808 to rk8xx, to make it clear.

Configs parts are done by sed -i "s/RK808/RK8XX/g" `grep RK808 -lr ./`
Signed-off-by: NJacob Chen <jacob-chen@iotwrt.com>

The RK818 chip is a Power Management IC (PMIC) for multimedia and handheld
devices.

For boards use rk818, the input current should be set in the early stage, before
ddr initialization.
Signed-off-by: NJacob Chen <jacob-chen@iotwrt.com>

Both RK808 and RK818 chips are using a similar register map,
so we can reuse them.

I have also add reg prefix to exist registers, to keep them same style.
Signed-off-by: NJacob Chen <jacob-chen@iotwrt.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

This Rockchip PMIC provides features suitable for battery-powered
applications. It is commonly used with Rockchip SoCs.

Add a driver which provides register access. The regulator driver will use
this.
Signed-off-by: NSimon Glass <sjg@chromium.org>