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From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>
Cc: John Youn <John.Youn@synopsys.com>
Subject: [PATCH v2 06/12] usb: devicetree: Introduce num-lanes and lsm
Date: Wed, 22 Jul 2020 19:12:39 -0700	[thread overview]
Message-ID: <d605a437f0a4bc837a05269caaa3875c2e0b29d8.1595468673.git.thinhn@synopsys.com> (raw)
In-Reply-To: <cover.1595468673.git.thinhn@synopsys.com>

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 <thinhn@synopsys.com>
---
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
-- 
2.11.0


  parent reply	other threads:[~2020-07-23  2:12 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23  2:12 [PATCH v2 00/12] usb: Handle different sublink speeds Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 01/12] usb: ch9: Add sublink speed struct Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 02/12] usb: gadget: composite: Avoid using magic numbers Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 03/12] usb: gadget: Expose sublink speed attributes Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 04/12] usb: gadget: Set max speed for SSP devices Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 05/12] usb: composite: Properly report sublink speed Thinh Nguyen
2020-07-23  2:12 ` Thinh Nguyen [this message]
2020-07-23 20:29   ` [PATCH v2 06/12] usb: devicetree: Introduce num-lanes and lsm Rob Herring
2020-07-24  2:39     ` Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 07/12] usb: common: Add functions to get lanes " Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 08/12] usb: dwc3: Initialize lane count and sublink speed Thinh Nguyen
2020-07-23  2:12 ` [PATCH v2 09/12] usb: dwc3: gadget: Report sublink speed capability Thinh Nguyen
2020-07-23  2:13 ` [PATCH v2 10/12] usb: dwc3: gadget: Implement setting of sublink speed Thinh Nguyen
2020-07-23  2:13 ` [PATCH v2 11/12] usb: dwc3: gadget: Track connected lane and " Thinh Nguyen
2020-07-23  2:13 ` [PATCH v2 12/12] usb: dwc3: gadget: Set speed only up to the max supported Thinh Nguyen

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