rockchip: rk3399: add Support NanoPi R4S 1GB DDR3 Version

[Kever Yang]

Hi

     This is not a complete patch, please clean the code and send the 
full patch.


Thanks,

- KEver

On 2022/7/27 08:05, h3lmut wrote:
> The NanoPi R4S 1GB version (rk3399) doesnt boot up with current u-boot. Armbian team has done some patches which will work with both versions (1GB and 4GB)
>
> Github Pr:
> https://github.com/anaelorlinski/OpenWrt-NanoPi-R2S-R4S-Builds/commit/9d836044340ddef53f5d9f1946ac48c946a78284
>
>  From 1bc90230df5cd55513268f2f7a43abdbad1161b5 Mon Sep 17 00:00:00 2001
> From: hmz007 <hmz007 at gmail.com>
> Date: Sat, 19 Dec 2020 19:39:14 +0800
> Subject: [PATCH 3/4] ram: rk3399: Add support for multiple DDR types
>
> Move rockchip,sdram-params to named subnode to include
> multiple sdram parameters, and then read the parameters
> (by subnode name, first subnode or current node) before
> rk3399_dmc_init().
>
> Signed-off-by: hmz007 <hmz007 at gmail.com>
> ---
>   arch/arm/dts/rk3399-sdram-ddr3-1333.dtsi      |  6 ++-
>   arch/arm/dts/rk3399-sdram-ddr3-1600.dtsi      |  5 +-
>   arch/arm/dts/rk3399-sdram-ddr3-1866.dtsi      |  6 ++-
>   .../arm/dts/rk3399-sdram-lpddr3-2GB-1600.dtsi |  3 ++
>   .../arm/dts/rk3399-sdram-lpddr3-4GB-1600.dtsi |  3 ++
>   .../rk3399-sdram-lpddr3-samsung-4GB-1866.dtsi |  3 ++
>   arch/arm/dts/rk3399-sdram-lpddr4-100.dtsi     |  3 ++
>   drivers/ram/rockchip/sdram_rk3399.c           | 49 +++++++++++++++----
>   8 files changed, 64 insertions(+), 14 deletions(-)
>
> diff --git a/arch/arm/dts/rk3399-sdram-ddr3-1333.dtsi b/arch/arm/dts/rk3399-sdram-ddr3-1333.dtsi
> index 7fae249536..dad5b7fbd4 100644
> --- a/arch/arm/dts/rk3399-sdram-ddr3-1333.dtsi
> +++ b/arch/arm/dts/rk3399-sdram-ddr3-1333.dtsi