This series adds the devicetree schema and the pinctrl driver for the
DP1000 controller using generic pinctrl bindings.

Compared with v1, this series is narrowed down to the pinctrl binding
and driver only. v1 patches 1, 2, 3, 5, 7, 8, and 9 (vendor prefix,
CPU/SoC bindings, DTS files, and defconfig update) are not included in
v2 and will be sent separately.

Note:
- ARCH_ULTRARISC support is being reviewed separately:
  * Link: https://lore.kernel.org/lkml/20260427-ultrarisc-pcie-v4-1-98935f6cdfb5@ultrarisc.com/

Testing:
- dt_binding_check and yamllint
- Kernel build for RISC-V and boot-tested on DP1000 (Milk-V Titan and
  Rongda M0)

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
---
Changes in v2:
- Split the vendor prefix, CPU binding, SoC binding, DTS, and defconfig
  patches out of this series for separate submission.
- Drop the legacy DT node format from both the binding and the driver,
  and switch to the generic pinctrl interface with
  pinconf_generic_dt_node_to_map_all().
- Drop the DT binding header from the series.
- Replace the generic func0/func1 mux names with named hardware functions
  in the binding and driver.
- Wire the driver through CONFIG_PINCTRL_ULTRARISC and add COMPILE_TEST
  coverage.
- Restrict function selection to valid pins in the driver.
- Link to v1: https://patch.msgid.link/20260515-ultrarisc-pinctrl-v1-0-bf559589ea8a@ultrarisc.com

---
Jia Wang (2):
      dt-bindings: pinctrl: Add UltraRISC DP1000 pinctrl controller
      pinctrl: ultrarisc: Add UltraRISC DP1000 pinctrl driver

 .../bindings/pinctrl/ultrarisc,dp1000-pinctrl.yaml | 128 ++++++
 MAINTAINERS                                        |   7 +
 drivers/pinctrl/Kconfig                            |   1 +
 drivers/pinctrl/Makefile                           |   1 +
 drivers/pinctrl/ultrarisc/Kconfig                  |  23 +
 drivers/pinctrl/ultrarisc/Makefile                 |   4 +
 drivers/pinctrl/ultrarisc/pinctrl-dp1000.c         | 172 +++++++
 drivers/pinctrl/ultrarisc/pinctrl-ultrarisc.c      | 496 +++++++++++++++++++++
 drivers/pinctrl/ultrarisc/pinctrl-ultrarisc.h      |  75 ++++
 9 files changed, 907 insertions(+)
---
base-commit: 8fde5d1d47f69db6082dfa34500c27f8485389a5
change-id: 20260316-ultrarisc-pinctrl-efa6e24c4803

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