[PATCH v4 0/2] Add driver support for Eswin EIC7700 SoC PCIe controller

zhangsenchuan
2025-10-30T08:29:51Z

From: Senchuan Zhang <zhangsenchuan@eswincomputing.com>

Changes in v4:
- Updates: eswin,eic7700-pcie.yaml
- Use snps,dw-pcie.yaml instead pci-host-bridge.yaml.

- Updates: snps,dw-pcie-common.yaml
- Add powerup reset property, our powerup property is somewhat different
from the general attributes defined by Synopsys DWC binding.

- Updates: pcie-eic7700.c
- Update the driver submission comment.
- Alphabetize so the menuconfig entries remain sorted by vendor.
- Update use PCI_CAP_LIST_NEXT_MASK macro.
- Use readl_poll_timeout function.
- Update eswin_pcie_suspend/eswin_pcie_resume name to
eswin_pcie_suspend_noirq/eswin_pcie_resume_noirq.
- PM use dw_pcie_suspend_noirq and dw_pcie_resume_noirq function and add
eswin_pcie_get_ltssm, eswin_pcie_pme_turn_off, eswin_pcie_host_exit
function adapt to PM.
- Link to V3: https://lore.kernel.org/linux-pci/20250923120946.1218-1-zhangsenchuan@eswincomputing.com/

Changes in v3:
- Updates: eswin,eic7700-pcie.yaml
- Based on the last patch yaml file, devicetree separates the root port
node, changing it significantly. Therefore, "Reviewed-by: Krzysztof
Kozlowski <krzysztof.kozlowski@linaro.org>" is not added.
- Clock and reset drivers are under review. In yaml, macro definitions
used in clock and reset can only be replaced by constant values.
- Move the num-lanes and perst resets to the PCIe Root Port node, make
it easier to support multiple Root Ports in future versions of the
hardware.
- Update the num-lanes attribute and modify define num-lanes as decimal.
- Optimize the ranges attribute and clear the relocatable flag (bit 31)
for any regions.
- Update comment: inte~inth are actual interrupts and these names align
with the interrupt names in the hardware IP, inte~inth interrupts
corresponds to Deassert_INTA~Deassert_INTD.
- Add Signed-off-by: Yanghui Ou <ouyanghui@eswincomputing.com>.

- Updates: pcie-eic7700.c
- Update the submission comment and add DWC IP revision, data rate, lane
information.
- Optimize the "config PCIE_EIC7700" configuration.
- Optimize the macro definition, add bitfield definition for the mask,
and remove redundant comments. optimize comments, make use of 80
columns for comments.
- Use the dw_pcie_find_capability function to obtain the offset by
traversing the function list.
- Remove the sets MPS code and configure it by PCI core.
- Alphabetize so the menuconfig entries remain sorted by vendor.
- Configure ESWIN VID:DID for Root Port as the default values are
invalid,and remove the redundant lane config.
- Use reverse Xmas order for all local variables in this driver
- Hardware doesn't support MSI-X but it advertises MSI-X capability, set
a flag and clear it conditionally.
- Resets are all necessary, Update the interface function for resets.
- Since driver does not depend on any parent to power on any resource,
the pm runtime related functions are removed.
- Remove "eswin_pcie_shutdown" function, our comment on the shutdown
function is incorrect. Moreover, when the host powers reboots,it will
enter the shutdown function, we are using host reset and do not need
to assert perst. Therefore, the shutdown function is not necessary.
- remove "eswin_pcie_remove", because it is not safe to remove it during
runtime, and this driver has been modified to builtin_platform_driver
and does not support hot plugging, therefore, the remove function is
not needed.
- The Suspend function adds link state judgment, and for controllers
with active devices, resources cannot be turned off.
- Add Signed-off-by: Yanghui Ou <ouyanghui@eswincomputing.com>.
- Link to V2: https://lore.kernel.org/linux-pci/20250829082021.49-1-zhangsenchuan@eswincomputing.com/

Changes in v2:
- Updates: eswin,eic7700-pcie.yaml
- Optimize the naming of "clock-names" and "reset-names".
- Add a reference to "$ref: /schemas/pci/pci-host-bridge.yaml#".
(The name of the reset attribute in the "snps,dw-pcie-common.yaml"
file is different from our reset attribute and "snps,dw-pcie.yaml"
file cannot be directly referenced)
- Follow DTS coding style to optimize yaml attributes.
- Remove status = "disabled" from yaml.

- Updates: pcie-eic7700.c
- Remove unnecessary imported header files.
- Use dev_err instead of pr_err and remove the WARN_ON function.
- The eswin_evb_socket_power_on function is removed and not supported.
- The eswin_pcie_remove function is placed after the probe function.
- Optimize function alignment.
- Manage the clock using the devm_clk_bulk_get_all_enabled function.
- Handle the release of resources after the dw_pcie_host_init function
call fails.
- Remove the dev_dbg function and remove __exit_p.
- Add support for the system pm function.
- Link to V1: https://lore.kernel.org/all/20250516094057.1300-1-zhangsenchuan@eswincomputing.com/

Senchuan Zhang (2):
dt-bindings: PCI: EIC7700: Add Eswin PCIe host controller
PCI: EIC7700: Add Eswin PCIe host controller driver

.../bindings/pci/eswin,eic7700-pcie.yaml | 166 +++++++
.../bindings/pci/snps,dw-pcie-common.yaml | 2 +-
drivers/pci/controller/dwc/Kconfig | 11 +
drivers/pci/controller/dwc/Makefile | 1 +
drivers/pci/controller/dwc/pcie-eic7700.c | 462 ++++++++++++++++++
5 files changed, 641 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/pci/eswin,eic7700-pcie.yaml
create mode 100644 drivers/pci/controller/dwc/pcie-eic7700.c

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