On Tue, Sep 22, 2020 at 06:46:47PM +0800, Li Jun wrote: > Add a property "xhci-64bit-support-disable" to disable xhci 64bit address > dma, some SoC integration may not support 64bit DMA but the AC64 bit > (bit 0) of HCCPARAMS1 is kept to be 1. Use 'dma-ranges' for this. > Signed-off-by: Li Jun <jun.li@xxxxxxx> > --- > Documentation/devicetree/bindings/usb/usb-xhci.txt | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt > index 0c5cff8..26446fb 100644 > --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt > +++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt > @@ -28,6 +28,9 @@ Optional properties: > - quirk-broken-port-ped: set if the controller has broken port disable mechanism > - imod-interval-ns: default interrupt moderation interval is 5000ns > - phys : see usb-hcd.yaml in the current directory > + - xhci-64bit-support-disable: set if the AC64 bit (bit 0) of HCCPARAMS1 is > + set to be 1, but the controller actually can't handle 64-bit address > + due to SoC integration. > > additionally the properties from usb-hcd.yaml (in the current directory) are > supported. > -- > 2.7.4 >
