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Thang Q. Nguyen
4750bc78ef
XHCI specification 1.1 does not require xHCI-compliant controllers to always enable hardware USB2 LPM. However, the current xHCI driver always enable it when seeing HLC=1. This patch supports an option for users to control disabling USB2 Hardware LPM via DT/ACPI attribute. This option is needed in case user would like to disable this feature. For example, their xHCI controller has its USB2 HW LPM broken. Signed-off-by: Tung Nguyen <tunguyen@apm.com> Signed-off-by: Thang Q. Nguyen <tqnguyen@apm.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
USB xHCI controllers
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Required properties:
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- compatible: should be one or more of
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- "generic-xhci" for generic XHCI device
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- "marvell,armada3700-xhci" for Armada 37xx SoCs
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- "marvell,armada-375-xhci" for Armada 375 SoCs
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- "marvell,armada-380-xhci" for Armada 38x SoCs
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- "renesas,xhci-r8a7790" for r8a7790 SoC
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- "renesas,xhci-r8a7791" for r8a7791 SoC
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- "renesas,xhci-r8a7793" for r8a7793 SoC
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- "renesas,xhci-r8a7795" for r8a7795 SoC
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- "renesas,xhci-r8a7796" for r8a7796 SoC
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- "renesas,rcar-gen2-xhci" for a generic R-Car Gen2 compatible device
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- "renesas,rcar-gen3-xhci" for a generic R-Car Gen3 compatible device
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- "xhci-platform" (deprecated)
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When compatible with the generic version, nodes must list the
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SoC-specific version corresponding to the platform first
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followed by the generic version.
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- reg: should contain address and length of the standard XHCI
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register set for the device.
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- interrupts: one XHCI interrupt should be described here.
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Optional properties:
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- clocks: reference to a clock
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- usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
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- usb3-lpm-capable: determines if platform is USB3 LPM capable
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- quirk-broken-port-ped: set if the controller has broken port disable mechanism
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Example:
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usb@f0931000 {
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compatible = "generic-xhci";
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reg = <0xf0931000 0x8c8>;
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interrupts = <0x0 0x4e 0x0>;
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};
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