[PATCH v2 06/12] usb: devicetree: Introduce num-lanes and lsm
From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Date: 2020-07-23 02:12:42
Also in:
linux-usb
Subsystem:
open firmware and flattened device tree bindings, the rest, usb subsystem · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds, Greg Kroah-Hartman
According to USB 3.2 spec, a super-speed-plus device can operate at gen2x2, gen2x1, or gen1x2. Introduce "num-lanes" and "lane-speed-mantissa-gbps" properties for devices operating in super-speed-plus. If the USB controller device supports multiple lanes at different transfer rate, the user can specify the HW capability via these properties. Signed-off-by: Thinh Nguyen <redacted> --- Changes in v2: - Make "num-lanes" and "lane-speed-mantissa-gbps" common USB properties Documentation/devicetree/bindings/usb/generic.txt | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index ba472e7aefc9..a8253da684af 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt@@ -7,6 +7,17 @@ Optional properties: "low-speed". In case this isn't passed via DT, USB controllers should default to their maximum HW capability. + - num-lanes: tells USB controllers that we want to work up to a certain number + of lanes. Valid arguments are 1 or 2. Apply if the + maximum-speed is super-speed-plus. In case this isn't + passed via DT, the USB controllers should default to + their maximum HW capability. + - lane-speed-mantissa-gbps: tells USB controllers that we want the symmetric + lanes to operate up to a certain rate in Gbps. Valid + inputs are 5 or 10 (i.e. Gen 1/Gen 2 transfer rate). + Apply if the maximum-speed is super-speed-plus. In case + this isn't passed via DT, the USB controllers should + default to their maximum HW capability. - dr_mode: tells Dual-Role USB controllers that we want to work on a particular mode. Valid arguments are "host", "peripheral" and "otg". In case this attribute isn't
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2.11.0