| Message ID | 3cf8c20044d15dfa5e5113b3a532054b4f96c13f.1595727196.git.thinhn@synopsys.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | usb: Handle different sublink speeds | expand |
On Sat, 25 Jul 2020 18:36:32 -0700, Thinh Nguyen wrote: > According to the USB 3.2 spec, a super-speed-plus device can operate at > gen2x2, gen2x1, or gen1x2. If the USB controller device supports > multiple lanes at different transfer rates, the user can specify the HW > capability via these new speed strings: > > "super-speed-plus-gen2x2" > "super-speed-plus-gen2x1" > "super-speed-plus-gen1x2" > > If the argument is simply "super-speed-plus", USB controllers should > default to their maximum transfer rate and number of lanes. > > Signed-off-by: Thinh Nguyen <thinhn@synopsys.com> > --- > Changes in v4: > - None > Changes in v3: > - Use "maximum-speed" to include both the num-lane and transfer rate for SSP > - Remove "num-lanes" and "lane-speed-mantissa-gbps" properties > Changes in v2: > - Make "num-lanes" and "lane-speed-mantissa-gbps" common USB properties > > Documentation/devicetree/bindings/usb/generic.txt | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-) > Reviewed-by: Rob Herring <robh@kernel.org>
Rob Herring wrote: > On Sat, 25 Jul 2020 18:36:32 -0700, Thinh Nguyen wrote: >> According to the USB 3.2 spec, a super-speed-plus device can operate at >> gen2x2, gen2x1, or gen1x2. If the USB controller device supports >> multiple lanes at different transfer rates, the user can specify the HW >> capability via these new speed strings: >> >> "super-speed-plus-gen2x2" >> "super-speed-plus-gen2x1" >> "super-speed-plus-gen1x2" >> >> If the argument is simply "super-speed-plus", USB controllers should >> default to their maximum transfer rate and number of lanes. >> >> Signed-off-by: Thinh Nguyen <thinhn@synopsys.com> >> --- >> Changes in v4: >> - None >> Changes in v3: >> - Use "maximum-speed" to include both the num-lane and transfer rate for SSP >> - Remove "num-lanes" and "lane-speed-mantissa-gbps" properties >> Changes in v2: >> - Make "num-lanes" and "lane-speed-mantissa-gbps" common USB properties >> >> Documentation/devicetree/bindings/usb/generic.txt | 11 +++++++---- >> 1 file changed, 7 insertions(+), 4 deletions(-) >> > Reviewed-by: Rob Herring <robh@kernel.org> Thanks! Thinh
diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt index ba472e7aefc9..8541b9571f2f 100644 --- a/Documentation/devicetree/bindings/usb/generic.txt +++ b/Documentation/devicetree/bindings/usb/generic.txt @@ -3,10 +3,13 @@ Generic USB Properties Optional properties: - maximum-speed: tells USB controllers we want to work up to a certain speed. Valid arguments are "super-speed-plus", - "super-speed", "high-speed", "full-speed" and - "low-speed". In case this isn't passed via DT, USB - controllers should default to their maximum HW - capability. + "super-speed-plus-gen2x2", "super-speed-plus-gen2x1", + "super-speed-plus-gen1x2", "super-speed", "high-speed", + "full-speed" and "low-speed". In case this isn't passed + via DT, USB controllers should default to their maximum + HW capability. Similarly, if the argument is + "super-speed-plus", USB controllers should default to + their maximum transfer rate and number of lanes. - 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
According to the USB 3.2 spec, a super-speed-plus device can operate at gen2x2, gen2x1, or gen1x2. If the USB controller device supports multiple lanes at different transfer rates, the user can specify the HW capability via these new speed strings: "super-speed-plus-gen2x2" "super-speed-plus-gen2x1" "super-speed-plus-gen1x2" If the argument is simply "super-speed-plus", USB controllers should default to their maximum transfer rate and number of lanes. Signed-off-by: Thinh Nguyen <thinhn@synopsys.com> --- Changes in v4: - None Changes in v3: - Use "maximum-speed" to include both the num-lane and transfer rate for SSP - Remove "num-lanes" and "lane-speed-mantissa-gbps" properties Changes in v2: - Make "num-lanes" and "lane-speed-mantissa-gbps" common USB properties Documentation/devicetree/bindings/usb/generic.txt | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)