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Subject[PATCH v2 0/4] PCI: imx: Add PME_Turn_Off support
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When the root complex suspends it must send a PME_Turn_Off TLP.
Implement this by asserting the "turnoff" reset.

On imx7d this functionality is part of the SRC and exposed through the
linux reset-controller subsystem. On imx6 equivalent bits are in the
IOMUXC GPR area which the imx6-pcie driver accesses directly.

This is only for imx7d right now but it's deliberately implemented as an
optional reset, ignoring the chip variant:
* Older dtbs won't have this reset so it will be ignored.
* Future chips might also expose this as a reset controller.

For example imx8m (not yet supported) has the exact same
PCIE_CTRL_APPS_TURNOFF bit in the same location.

---
Changes since v1:
* Add 1-10ms sleep after PME_Turn_Off, with explanation
* Slight fix in commit msg (this is functionality is)
* Link: https://lore.kernel.org/patchwork/cover/994076/

Leonard Crestez (4):
reset: imx7: Add PCIE_CTRL_APPS_TURNOFF
dt-bindings: imx6q-pcie: Add turnoff reset for imx7d
ARM: dts: imx7d: Add turnoff reset
PCI: imx: Add PME_Turn_Off support

.../bindings/pci/fsl,imx6q-pcie.txt | 1 +
arch/arm/boot/dts/imx7d.dtsi | 5 ++--
drivers/pci/controller/dwc/pci-imx6.c | 24 +++++++++++++++++++
drivers/reset/reset-imx7.c | 1 +
include/dt-bindings/reset/imx7-reset.h | 4 +++-
5 files changed, 32 insertions(+), 3 deletions(-)

--
2.17.1

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