This series fixes PCIe card enumeration issue in am57xx-evm. In the case of am57xx-evm, the PERST# line is connected to a gpio line and this has to be driven low in order to perform a fundamental reset of the card. If the gpio line is driven high, there is no way the card can come out of reset. Add support in the pcie-dra7xx driver to make gpio drive PERST# line. The PERST# line can be used to perform reset not during the power on sequence too (warm reset) but we are not adding support for this as the PCIe express base sepcification doesn't explain how to perform warm reset "In some cases, it may be possible for the Fundamental Reset mechanism to be triggered by hardware without the removal and re-application of power to the component. This is called a warm reset. This document does not specify a means for generating a warm reset." Kishon Vijay Abraham I (2): pci: host: pci-dra7xx: Add support to make gpio drive PERST# line ARM: dts: am57xx-evm: Add 'gpios' property with gpio2_8 Documentation/devicetree/bindings/pci/ti-pci.txt | 3 +++ arch/arm/boot/dts/am57xx-beagle-x15.dts | 5 +++++ arch/arm/boot/dts/dra7.dtsi | 2 +- drivers/pci/host/pci-dra7xx.c | 24 ++++++++++++++++++++-- 4 files changed, 31 insertions(+), 3 deletions(-) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
