clk: ultrarisc: add DP1000 clock support

This series adds the devicetree binding and the clock driver for the
UltraRISC DP1000 SoC.

The clock tree is driven by a single SYSPLL and provides fixed-factor
clocks for the subsystem including PCIe, divider-based root clocks for
GMAC and the UART, I2C, and SPI blocks, and per-instance gate clocks
for UART0-3, I2C0-3, and SPI0-1.

Testing:
- dt_binding_check and dtbs_check on ultrarisc,dp1000-clk
- Kernel build for RISC-V and boot-tested on DP1000

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
---
Jia Wang (2):
      dt-bindings: clock: ultrarisc: Add DP1000 Clock Controller
      clk: ultrarisc: add DP1000 clock driver

 .../bindings/clock/ultrarisc,dp1000-clk.yaml       |  72 ++++
 MAINTAINERS                                        |   8 +
 drivers/clk/Kconfig                                |   1 +
 drivers/clk/Makefile                               |   1 +
 drivers/clk/ultrarisc/Kconfig                      |  18 +
 drivers/clk/ultrarisc/Makefile                     |   4 +
 drivers/clk/ultrarisc/clk-dp1000.c                 | 152 ++++++++
 drivers/clk/ultrarisc/clk-ultrarisc.c              | 417 +++++++++++++++++++++
 drivers/clk/ultrarisc/clk-ultrarisc.h              |  73 ++++
 include/dt-bindings/clock/ultrarisc,dp1000-clk.h   |  29 ++
 10 files changed, 775 insertions(+)
---
base-commit: 2d3090a8aeb596a26935db0955d46c9a5db5c6ce
change-id: 20260522-ultrarisc-clock-a1b7aa59f60b

Best regards,
--  
Jia Wang <wangjia@ultrarisc.com>