[PATCH 04/10] ram: thead: Add initial DDR controller support for TH1520

[Leo Liang]

On Sat, Apr 26, 2025 at 04:56:58PM +0000, Yao Zi wrote:
> [EXTERNAL MAIL]
> 
> This patch cleans the vendor code of DDR initialization up, converts the
> driver to fit in DM framework and use a firmware[1] packaged by binman to
> ship PHY configuration.
> 
> Currently the driver is only capable of initializing the controller to
> work with dual-rank 3733MHz LPDDR4, which is shipped by 16GiB variants
> of LicheePi 4A boards and I could test with. Support for other
> configurations could be easily added later.
> 
> Link: https://github.com/ziyao233/th1520-firmware # [1]
> Signed-off-by: Yao Zi <ziyao at disroot.org>
> ---
>  drivers/ram/Kconfig            |   1 +
>  drivers/ram/Makefile           |   4 +
>  drivers/ram/thead/Kconfig      |   5 +
>  drivers/ram/thead/Makefile     |   1 +
>  drivers/ram/thead/th1520_ddr.c | 781 +++++++++++++++++++++++++++++++++
>  5 files changed, 792 insertions(+)
>  create mode 100644 drivers/ram/thead/Kconfig
>  create mode 100644 drivers/ram/thead/Makefile
>  create mode 100644 drivers/ram/thead/th1520_ddr.c

Reviewed-by: Leo Yu-Chi Liang <ycliang at andestech.com>