Each PCIe controller on SA8775P includes a 'link_down' reset line in
hardware. This patch documents the reset in the device tree binding.
The 'link_down' reset is used to forcefully bring down the PCIe link
layer, which is useful in scenarios such as link recovery after errors,
power management transitions, and hotplug events. Including this reset
line improves robustness and provides finer control over PCIe controller
behavior.
As the 'link_down' reset was omitted in the initial submission, it is now
being documented. While this reset is not required for most of the block's
basic functionality, and device trees lacking it will continue to function
correctly in most cases, it is necessary to ensure maximum robustness when
shutting down or recovering the PCIe core. Therefore, its inclusion is
justified despite the minor ABI change.
Signed-off-by: Ziyue Zhang <ziyue.zhang@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://patch.msgid.link/20250718081718.390790-3-ziyue.zhang@oss.qualcomm.com
QCS8300 is derived from SA8775p. Hence, add the callback with SA8775p as
the fallback.
Signed-off-by: Ziyue Zhang <quic_ziyuzhan@quicinc.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250529035635.4162149-3-quic_ziyuzhan@quicinc.com
'global' interrupt is used to receive PCIe controller and link specific
events.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250227-pcie-global-irq-v1-7-2b70a7819d1e@linaro.org
Move SA8775p PCIe devices from qcom,pcie.yaml binding to a dedicated file
to make reviewing easier.
This creates equivalent schema file, except:
- Missing required compatible which is actually redundant.
- Expecting eight MSI interrupts, instead of only one, which was
incomplete hardware description.
Link: https://lore.kernel.org/linux-pci/20240205-dt-bindings-pci-qcom-split-continued-v1-3-c333cab5eeea@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
