[PATCH v3 1/4] dt-bindings: usb: Add documentation for SG trb cache size quirk

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This commit adds the documentation for sgl-trb-cache-size-quirk, and
snps,sgl-trb-cache-size-quirk property. These when set enables the
quirk for XHCI driver for consolidation of sg list into a temporary
buffer when small buffer sizes are scattered over the sg list not
making up to MPS or total transfer size within TRB cache size with
Synopsys xHC.

Signed-off-by: Tejas Joglekar <joglekar@xxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/usb/dwc3.txt     | 4 ++++
 Documentation/devicetree/bindings/usb/usb-xhci.txt | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index d03edf9d3935..0fcbaa51f66e 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -102,6 +102,10 @@ Optional properties:
 			this and tx-thr-num-pkt-prd to a valid, non-zero value
 			1-16 (DWC_usb31 programming guide section 1.2.3) to
 			enable periodic ESS TX threshold.
+ - snps,sgl-trb-cache-size-quirk: enable sg list consolidation - host mode
+			only. Set to use SG buffers of at least MPS size
+			by consolidating smaller SG buffers list into a
+			single buffer.
 
  - <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.
  - snps,incr-burst-type-adjustment: Value for INCR burst type of GSBUSCFG0
diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index dc025f126d71..c53eb19ae67e 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -44,6 +44,9 @@ 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
+  - sgl-trb-cache-size-quirk: set if you need to consolidate sg list into a
+    temporary buffer when small SG buffer sizes does not make upto MPS
+    size or total transfer size across the TRB cache size.
 
 additionally the properties from usb-hcd.yaml (in the current directory) are
 supported.
-- 
2.11.0




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