| From: |
| Jia Wang <wangjia-AT-ultrarisc.com> |
| To: |
| Ilpo Järvinen <ilpo.jarvinen-AT-linux.intel.com>, Andy Shevchenko <andriy.shevchenko-AT-linux.intel.com>, Greg Kroah-Hartman <gregkh-AT-linuxfoundation.org>, Jiri Slaby <jirislaby-AT-kernel.org>, Paul Walmsley <pjw-AT-kernel.org>, Palmer Dabbelt <palmer-AT-dabbelt.com>, Albert Ou <aou-AT-eecs.berkeley.edu>, Alexandre Ghiti <alex-AT-ghiti.fr>, Rob Herring <robh-AT-kernel.org>, Krzysztof Kozlowski <krzk+dt-AT-kernel.org>, Conor Dooley <conor+dt-AT-kernel.org> |
| Subject: |
| [PATCH v4 0/4] serial: 8250_dw: Add support for UltraRISC DP1000 UART |
| Date: |
| Fri, 24 Apr 2026 13:39:27 +0800 |
| Message-ID: |
| <20260424-ultrarisc-serial-v4-0-1765a0b4c4a0@ultrarisc.com> |
| Cc: |
| linux-kernel-AT-vger.kernel.org, linux-serial-AT-vger.kernel.org, linux-riscv-AT-lists.infradead.org, devicetree-AT-vger.kernel.org, Jia Wang <wangjia-AT-ultrarisc.com>, Conor Dooley <conor.dooley-AT-microchip.com> |
| Archive-link: |
| Article |
This patch series adds support for the UltraRISC DP1000 UART controller.
The series includes four patches. The first two are preparatory cleanups;
the last two add the DP1000 compatible and fixed CPR handling.
The patches have been tested on an UltraRISC DP1000 development board with
Linux v7.0-rc7, verifying basic UART functionality.
Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
---
Changes in v4:
- Added two preparatory patches before the original series, shifting patch
numbers (former 1/2 -> now 3/4).
- Patch 1:
* Move all DesignWare UART register/field definitions into 8250_dwlib.h
for shared use with 8250_dw.
- Patch 2:
* Converted the Renesas RZ/N1 CPR magic value to use DW_UART_CPR_* macros
and FIELD_PREP_CONST().
- Patch 4:
* Converted the UltraRISC DP1000 CPR magic value to use
DW_UART_CPR_* macros and FIELD_PREP_CONST() (value unchanged).
- Link to v3: https://patch.msgid.link/20260421-ultrarisc-serial-v3-0-3...
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-v2-0-6...
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-c...
---
Jia Wang (4):
serial: 8250_dwlib: move DesignWare register definitions to header
serial: 8250_dw: build Renesas RZN1 CPR value from DW_UART_CPR_* definitions
dt-bindings: serial: snps-dw-apb-uart: Add UltraRISC DP1000 UART
serial: 8250_dw: Use a fixed CPR value for UltraRISC DP1000 UART
.../bindings/serial/snps-dw-apb-uart.yaml | 1 +
drivers/tty/serial/8250/8250_dw.c | 31 ++++++-----
drivers/tty/serial/8250/8250_dwlib.c | 49 -----------------
drivers/tty/serial/8250/8250_dwlib.h | 63 ++++++++++++++++++++++
4 files changed, 83 insertions(+), 61 deletions(-)
---
base-commit: e774d5f1bc27a85f858bce7688509e866f8e8a4e
change-id: 20260309-ultrarisc-serial-64ff637edf26
Best regards,
--
Jia Wang <wangjia@ultrarisc.com>
