riscv: canaan: Add support for K230-Canmv clock

This patch series adds clock controller support for the Canaan Kendryte
K230 SoC. The K230 SoC includes an external 24MHz OSC and 4 internal
PLLs, with the controller managing these sources and their derived clocks.

The clock tree and hardware-specific definition can be found in the
vendor's DTS [1],
and this series is based on the K230 initial series [2].

Link: https://github.com/kendryte/k230_sdk/blob/main/src/little... [1]
Link: https://lore.kernel.org/linux-clk/tencent_F76EB8D731C521C... [2]

Co-developed-by: Troy Mitchell <TroyMitchell988@gmail.com>
Signed-off-by: Troy Mitchell <TroyMitchell988@gmail.com>
Signed-off-by: Xukai Wang <kingxukai@zohomail.com>

---
Changes in v5:
- Fix incorrect base-commit and add prerequisite-patch-id.
- Replace dummy apb_clk with real ones for UARTs.
- Add IDs of UARTs clock and DMA clocks in the binding header.
- Replace k230_clk_cfgs[] array with corresponding named variables.
- Remove some redundant checks in clk_ops.
- Drop the unnecessary parenthesis and type casts.
- Modify return value handling in probe path to avoid redundant print.
- Link to v4: https://lore.kernel.org/r/20250217-b4-k230-clk-v4-0-5a95a...

Changes in v4:
- Remove redundant onecell_get callback and add_provider function
for pll_divs.
- Modify the base-commit in cover letter.
- Link to v3: https://lore.kernel.org/r/20250203-b4-k230-clk-v3-0-362c7...

Changes in v3:
- Reorder the defination and declaration in drivers code.
- Reorder the properties in dts node.
- Replace global variable `k230_sysclk` with dynamic memory allocation.
- Rename the macro K230_NUM_CLKS to K230_CLK_NUM.
- Use dev_err_probe for error handling.
- Remove unused includes.
- Link to v2: https://lore.kernel.org/r/20250108-b4-k230-clk-v2-0-27b30...

Changes in v2:
- Add items and description.
- Rename k230-clk.h to canaan,k230-clk.h
- Link to v1: https://lore.kernel.org/r/20241229-b4-k230-clk-v1-0-221a9...

---
Xukai Wang (3):
      dt-bindings: clock: Add bindings for Canaan K230 clock controller
      clk: canaan: Add clock driver for Canaan K230
      riscv: dts: canaan: Add clock definition for K230

 .../devicetree/bindings/clock/canaan,k230-clk.yaml |   43 +
 arch/riscv/boot/dts/canaan/k230.dtsi               |   25 +-
 drivers/clk/Kconfig                                |    6 +
 drivers/clk/Makefile                               |    1 +
 drivers/clk/clk-k230.c                             | 1717 ++++++++++++++++++++
 include/dt-bindings/clock/canaan,k230-clk.h        |   69 +
 6 files changed, 1853 insertions(+), 8 deletions(-)
---
base-commit: 0eea987088a22d73d81e968de7347cdc7e594f72
change-id: 20241206-b4-k230-clk-925f33fed6c2
prerequisite-patch-id: deda3c472f0000ffd40cddd7cf6d3b5e2d7da7dc

Best regards,
-- 
Xukai Wang <kingxukai@zohomail.com>