[PATCH v2 0/3] PCI: ultrarisc: Add DP1000 PCIe clock support

[Jia Wang via B4 Relay]

Add clock handling for the UltraRISC DP1000 DesignWare PCIe host
controller.

The DP1000 PCIe controller depends on three input clocks: core, dbi, and
aux. The driver accesses DBI registers during host initialization, so the
clocks must be enabled before the controller registers are touched.

This series documents the required clocks in the device tree binding,
enables the core, dbi, and aux clocks before DesignWare host
initialization, and keeps them managed across probe failure, detach, and
system suspend/resume. It also switches the driver to
module_platform_driver() so the existing tristate Kconfig option builds
correctly as a module.

Testing:
- Build and module build tested with ARCH=riscv.
- Boot tested on UltraRISC DP1000.
- Validated the PCIe binding with dt_binding_check and dtbs_check.

Signed-off-by: Jia Wang <wangjia@xxxxxxxxxxxxx>
---
Changes in v2:
- Add Fixes and Acked-by tags to the binding patch.
- Add a Fixes tag to the driver clock handling patch.
- Fix the suspend/resume clock handling so clocks are disabled only after a
  successful suspend and kept enabled on resume failure.
- Add a module build fix by switching to module_platform_driver().
- Link to v1: https://patch.msgid.link/20260629-ultrarisc-pci-clk-v1-0-5ea3308fdab3@xxxxxxxxxxxxx

To: Xincheng Zhang <zhangxincheng@xxxxxxxxxxxxx>
To: Jia Wang <wangjia@xxxxxxxxxxxxx>
To: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
To: Krzysztof Wilczyński <kwilczynski@xxxxxxxxxx>
To: Manivannan Sadhasivam <mani@xxxxxxxxxx>
To: Rob Herring <robh@xxxxxxxxxx>
To: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
To: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
To: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

---
Jia Wang (3):
      dt-bindings: pci: ultrarisc: add required DP1000 PCIe clocks
      PCI: ultrarisc: get and enable DP1000 PCIe clocks
      PCI: ultrarisc: allow DP1000 driver to build as module

 .../bindings/pci/ultrarisc,dp1000-pcie.yaml        | 16 +++++
 drivers/pci/controller/dwc/pcie-ultrarisc.c        | 70 +++++++++++++++++++---
 2 files changed, 79 insertions(+), 7 deletions(-)
---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260617-ultrarisc-pci-clk-ac19047af1ea

Best regards,
--  
Jia Wang <wangjia@xxxxxxxxxxxxx>