On Fri, 18 Jul 2025 16:17:16 +0800, Ziyue Zhang wrote: > 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@xxxxxxxxxxxxxxxx> > --- > .../devicetree/bindings/pci/qcom,pcie-sa8775p.yaml | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>
