[PATCH v3 0/2] serial: 8250_dw: Add support for UltraRISC DP1000 uart

[Jia Wang]

This patch series adds support for the UltraRISC DP1000 UART controller.

The series includes two patches:
1. Document the DP1000-specific compatible string for this UART variant.
2. Update 8250_dw to use a fixed CPR value for the DP1000 UART.

The patches have been tested on Ultrarisc DP1000 development board with
Linux v7.0-rc7, verifying basic UART functionality.

Signed-off-by: Jia Wang <wangjia at ultrarisc.com>
---
Changes in v3:
- Rebased on Linux v7.0-rc7.
- Patch 1:
   * Removed separate `items` entry for DP1000, merging it into the
     existing `enum` to comply with the schema.
   * Updated commit message to describe DP1000 UART hardware differences.
- Patch 2:
   * Drop the custom quirk for missing CPR register.
   * Switch to using DW_UART_QUIRK_CPR_VALUE to provide a fixed CPR value.
- Link to v2: https://patch.msgid.link/20260316-ultrarisc-serial-v2-0-6ab3e7fa891c@ultrarisc.com

Changes in v2:
- Rebased on Linux v7.0-rc4 (previously on v7.0-rc2).
- Reordered patch series: DT binding patch comes before driver changes.
- Updated commit message for DT binding patch.
- Link to v1: https://patch.msgid.link/20260316-ultrarisc-serial-v1-0-c464f3e933a5@ultrarisc.com

---
Jia Wang (2):
      dt-bindings: serial: snps-dw-apb-uart: Add UltraRISC DP1000 UART
      serial: 8250_dw: Use a fixed CPR value for UltraRISC DP1000 UART

 Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml | 1 +
 drivers/tty/serial/8250/8250_dw.c                              | 7 +++++++
 2 files changed, 8 insertions(+)
---
base-commit: e774d5f1bc27a85f858bce7688509e866f8e8a4e
change-id: 20260309-ultrarisc-serial-64ff637edf26

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