[U-Boot] [U-Boot,1/8] adc: Add driver for Rockchip Saradc

[Philipp Tomsich]

> The ADC can support some channels signal-ended some bits Successive Approximation
> Register (SAR) A/D Converter, like 6-channel and 10-bit. It converts the analog
> input signal into some bits binary digital codes.
> 
> Signed-off-by: David Wu <david.wu at rock-chips.com>
> ---
>  drivers/adc/Kconfig           |   9 ++
>  drivers/adc/Makefile          |   1 +
>  drivers/adc/rockchip-saradc.c | 188 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 198 insertions(+)
>  create mode 100644 drivers/adc/rockchip-saradc.c
> 

Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>