path: root/README
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authorLan Tianyu <tianyu.lan@intel.com>2012-08-17 14:44:09 +0800
committerLen Brown <len.brown@intel.com>2012-09-21 13:30:29 -0400
commit1033f9041d526dd694e2b2e12744e47c41040c4d (patch)
treea953100e337dd4f464253f88a476f990c4209f26 /README
parentc46de2263f42fb4bbde411b9126f471e9343cb22 (diff)
ACPI: Allow ACPI binding with USB-3.0 hub
A USB port's position and connectability can't be identified on some boards via USB hub registers. ACPI _UPC and _PLD can help to resolve this issue and so it is necessary to bind USB with ACPI. This patch is to allow ACPI binding with USB-3.0 hub. Current ACPI only can bind one struct-device to one ACPI device node. This can not work with USB-3.0 hub, because the USB-3.0 hub has two logical devices. Each works for USB-2.0 and USB-3.0 devices. In the Linux USB subsystem, those two logical hubs are treated as two seperate devices that have two struct devices. But in the ACPI DSDT, these two logical hubs share one ACPI device node. So there is a requirement to bind multi struct-devices to one ACPI device node. This patch is to resolve such problem. Following is the ACPI device nodes' description under xhci hcd. Device (XHC) Device (RHUB) Device (HSP1) Device (HSP2) Device (HSP3) Device (HSP4) Device (SSP1) Device (SSP2) Device (SSP3) Device (SSP4) Topology in the Linux device XHC USB-2.0 logical hub USB-3.0 logical hub HSP1 SSP1 HSP2 SSP2 HSP3 SSP3 HSP4 SSP4 This patch also modifies the output of /proc/acpi/wakeup. One ACPI node can be associated with multiple devices: XHC S4 *enabled pci:0000:00:14.0 RHUB S0 disabled usb:usb1 disabled usb:usb2 Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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