[PATCH v6 0/3] pinctrl: aspeed: Add AST2700 SoC0 support

Billy Tsai
2026-04-14T09:39:22Z

AST2700 is composed of two interconnected SoC instances, each providing
its own pin control hardware. This series introduces bindings describing
the AST2700 pinctrl architecture and adds pinctrl driver support for the
SoC0 instance.

The bindings document the AST2700 dual-SoC design and follow common
pinctrl conventions, while the SoC0 driver implementation builds upon
the existing ASPEED pinctrl infrastructure.

---
Changes in v6:
- Restrict AST2700 SoC0 pinctrl pin configuration properties
(`drive-strength` and `bias-*`) to `pins`-based state nodes in the
binding schema.
- Move `memory-region` and `memory-region-names` in the AST2x00 SCU
binding to top-level descriptions, and keep the conditional schema
only to disallow them for non-AST2700 SCU0 compatibles.
- Add bias pull-up, pull-down, and disable support for AST2700 SoC0
GPIO18A/GPIO18B pins in the pinctrl driver.
- Fix the USB2 Port B XH/XHP mux selector definitions to use the
correct `PORTB_U2_XH_DESC` setting.
- Link to v5: https://lore.kernel.org/r/20260331-upstream_pinctrl-v5-0-8994f59ff367@aspeedtech.com

Changes in v5:
- Complete the AST2700 SCU0 binding and disallow child nodes that are
not relevant for the hardware (p2a-control and smp-memram).
- Add examples for both the AST2700 SCU0 binding and the pinctrl binding,
ensuring they are valid against the schema.
- Rework the pinctrl binding example to be self-contained and independent
of the SCU binding.
- Reorder the binding patches so the pinctrl binding is introduced before
the SCU binding update, allowing the SCU example to be added cleanly.
- Adjust the binding accordingly to restrict drive-strength to the
supported values.
- Update the drive-strength table to match hardware-defined values.
- Link to v4: https://lore.kernel.org/r/20260306-upstream_pinctrl-v4-0-ad4e8ab8b489@aspeedtech.com

Changes in v4:
- Rename series title to "pinctrl: aspeed: Add AST2700 SoC0 support"
to make it specific to SoC0.
- Remove unnecessary SCU example from bindings.
- Fix Makefile newline to avoid patch warning.
- Make pinctrl data structures const and align with existing Aspeed drivers.
- Sort the arrays and enums alphabetically.
- Minor cleanups for consistency, no functional changes.
- Link to v3: https://lore.kernel.org/r/20260120-upstream_pinctrl-v3-0-868fbf8413b5@aspeedtech.com

Changes in v3:
dt-bindings: pinctrl: aspeed: AST2700 pinctrl improvements
- Improved binding descriptions for SoC0 and SoC1 to better explain the
AST2700 dual-SoC architecture with independent pin control blocks
- Switched from additionalProperties to patternProperties using the
'-state$' suffix to restrict child node naming
- Removed per-binding examples based on review feedback
- Added additionalProperties: false at the top level for stricter schema
validation
- Dropped the aspeed,ast2700-soc1-pinctrl binding, as the SoC1 pinctrl
registers follow a regular layout and can be described using an
existing generic pinctrl binding
- Updated the function and group enum lists to match the definitions
used by the AST2700 pinctrl driver

dt-bindings: mfd: aspeed: Add AST2700 SCU example with pinctrl
- Added a complete AST2700 SCU0 example demonstrating pinctrl integration
- Example covers both pin function/group configuration and pin
drive-strength settings
- Updated child node naming to use the '-state' suffix, following common
pinctrl conventions

pinctrl: aspeed: AST2700 SoC0 driver improvements
- Refactored pin and signal declarations to use common ASPEED pinmux
macros (SIG_EXPR_LIST_DECL_SEMG, SIG_EXPR_LIST_DECL_SESG, PIN_DECL_*)
- Added SCU010 register definition for hardware strap control
- Reworked code structure to better align with existing ASPEED pinctrl
drivers

- Link to v2: https://lore.kernel.org/r/20250904103401.88287-1-billy_tsai@aspeedtech.com

Changes in v2:
- Update pinctrl aspeed binding files.
- Update the commit message for pinctrl binding patch.
- Link to v1: https://lore.kernel.org/r/20250829073030.2749482-1-billy_tsai@aspeedtech.com

---
Billy Tsai (3):
dt-bindings: pinctrl: Add aspeed,ast2700-soc0-pinctrl
dt-bindings: mfd: aspeed,ast2x00-scu: Describe AST2700 SCU0
pinctrl: aspeed: Add AST2700 SoC0 support

.../bindings/mfd/aspeed,ast2x00-scu.yaml | 112 +++
.../pinctrl/aspeed,ast2700-soc0-pinctrl.yaml | 170 +++++
drivers/pinctrl/aspeed/Kconfig | 9 +
drivers/pinctrl/aspeed/Makefile | 1 +
drivers/pinctrl/aspeed/pinctrl-aspeed-g7-soc0.c | 749 +++++++++++++++++++++
5 files changed, 1041 insertions(+)
---
base-commit: af4e9ef3d78420feb8fe58cd9a1ab80c501b3c08
change-id: 20251215-upstream_pinctrl-8f195df0a975

Best regards,
--
Billy Tsai <billy_tsai@aspeedtech.com>