[PATCH v3 1/6] dt-bindings: usb: xhci: add property to disable xhci 64bit support

[Rob Herring]

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 at nxp.com>
> ---
>  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
>