[PATCH v2 00/16] riscv: k210: Enable use of AI ram bank

[Sean Anderson]

On 10/12/20 2:13 PM, Sean Anderson wrote:
> This ram bank was previously unusable because PLL1 was not started correctly.
> This series fixes that bug, and allows U-Boot to relocate into the AI ram. This
> provides an extra 2M of space in which to load payloads.
> 
> Second time around and I realized that the bypass clock is no longer necessary
> (yay). This also necessitates a few more small fixups. I've also added some
> minor patches to bring the device tree and clock driver closer to what Linux has
> (or will have). This should be the last round of additions to this series.

I discovered that the clock changes I made cause problems with
non-default PLL frequencies (specifically the removal of the bypass
clock). I've been working on-and-off on a v3 to fix these problems.

--Sean

> Changes in v2:
> - Don't re-enable the PLL
> - Remove bypass clock, which is no longer necessary
> - Simplify PLL instantiation
> - Modify clock tree so clint is a child of aclk
> - Sync memory dts node with Linux
> - Use correct aisram clock
> 
> Sean Anderson (16):
>   clk: k210: Fix PLLs not being enabled
>   clk: k210: Fix PLL enable always getting taken
>   clk: k210: Remove bypass clock
>   clk: k210: Remove k210_register_pll
>   clk: k210: Move the clint clock to under aclk
>   clk: Add support for the k210 clock driver pre-relocation
>   riscv: Enable some devices pre-relocation
>   lib: fdt: Add fdtdec_setup_mem_size_base_highest
>   test: Add a test for fdtdec_setup_mem_size_base et al.
>   ram: Add driver for K210 SRAM
>   ram: sifive: Default to y only if compiling for fu540
>   riscv: Probe ram in dram_init
>   riscv: Enable AI ram on K210
>   riscv: k210: Rename airam to aisram
>   riscv: k210: Use AI as the parent clock of aisram, not PLL1
>   riscv: Don't reserve AI ram in k210 dts
> 
>  MAINTAINERS                        |   1 +
>  arch/riscv/cpu/generic/dram.c      |  26 +++
>  arch/riscv/dts/k210.dtsi           |  22 +--
>  arch/sandbox/dts/test.dts          |  12 ++
>  board/sipeed/maix/Kconfig          |   2 +
>  board/sipeed/maix/maix.c           |  26 ---
>  configs/sandbox64_defconfig        |   2 +-
>  configs/sandbox_defconfig          |   2 +-
>  configs/sandbox_flattree_defconfig |   2 +-
>  configs/sipeed_maix_bitm_defconfig |   1 +
>  drivers/clk/kendryte/Makefile      |   2 +-
>  drivers/clk/kendryte/bypass.c      | 273 -----------------------------
>  drivers/clk/kendryte/clk.c         |  61 +++----
>  drivers/clk/kendryte/pll.c         |  26 +--
>  drivers/ram/Kconfig                |   7 +
>  drivers/ram/Makefile               |   1 +
>  drivers/ram/kendryte.c             |  56 ++++++
>  drivers/ram/sifive/Kconfig         |   2 +-
>  include/configs/sipeed-maix.h      |   4 -
>  include/fdtdec.h                   |  19 +-
>  include/kendryte/bypass.h          |  31 ----
>  include/kendryte/pll.h             |   4 -
>  lib/fdtdec.c                       |  34 +++-
>  test/dm/fdtdec.c                   |  38 ++++
>  24 files changed, 230 insertions(+), 424 deletions(-)
>  delete mode 100644 drivers/clk/kendryte/bypass.c
>  create mode 100644 drivers/ram/kendryte.c
>  delete mode 100644 include/kendryte/bypass.h
>