Re: [PATCH 06/11] usb: devicetree: dwc3: Introduce num-lanes and lsm
From: Rob Herring <robh@kernel.org>
Date: 2020-07-21 03:39:11
Also in:
linux-devicetree
On Thu, Jul 16, 2020 at 02:59:08PM -0700, Thinh Nguyen wrote:
quoted hunk ↗ jump to hunk
Introduce num-lanes and lane-speed-mantissa-gbps for devices operating in super-speed-plus. DWC_usb32 IP supports multiple lanes and can operate in different sublink speeds. Currently the device controller does not have the information of the phy's number of lanes supported. As a result, the user can specify them through these properties if they are different than the default setting. Signed-off-by: Thinh Nguyen <redacted> --- Documentation/devicetree/bindings/usb/dwc3.txt | 9 +++++++++ 1 file changed, 9 insertions(+)diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt index d03edf9d3935..4eba0615562f 100644 --- a/Documentation/devicetree/bindings/usb/dwc3.txt +++ b/Documentation/devicetree/bindings/usb/dwc3.txt@@ -86,6 +86,15 @@ Optional properties: - snps,quirk-frame-length-adjustment: Value for GFLADJ_30MHZ field of GFLADJ register for post-silicon frame length adjustment when the fladj_30mhz_sdbnd signal is invalid or incorrect. + - snps,num-lanes: set to specify the number of lanes to use. Valid inputs are + 1 or 2. Apply if the maximum-speed is super-speed-plus + only. Default value is 2 for DWC_usb32. For DWC_usb31, + it is always 1 at super-speed-plus. + - snps,lane-speed-mantissa-gbps: set to specify the symmetric lane speed + mantissa in Gbps. Valid inputs are 5 or 10. Apply if + the maximum-speed is super-speed-plus only. Default + value is 10. For DWC_usb31, it's always 10 at + super-speed-plus.
This is all common USB things and should be common properties (which we may already have). Rob