diff mbox series

[v7,5/5] dt-bindings: usb: dwc3: Update dwc3 TX fifo properties

Message ID 1611895604-4496-6-git-send-email-wcheng@codeaurora.org
State Superseded
Headers show
Series Re-introduce TX FIFO resize for larger EP bursting | expand

Commit Message

Wesley Cheng Jan. 29, 2021, 4:46 a.m. UTC
Update the tx-fifo-resize property with a better description, while
adding the tx-fifo-max-num, which is a new parameter allowing
adjustments for the maximum number of packets the txfifo resizing logic
can account for while resizing the endpoints.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Comments

Rob Herring Feb. 5, 2021, 8:47 p.m. UTC | #1
On Thu, 28 Jan 2021 20:46:44 -0800, Wesley Cheng wrote:
> Update the tx-fifo-resize property with a better description, while
> adding the tx-fifo-max-num, which is a new parameter allowing
> adjustments for the maximum number of packets the txfifo resizing logic
> can account for while resizing the endpoints.
> 
> Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 2247da7..652b246 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -283,10 +283,21 @@  properties:
     maximum: 16
 
   tx-fifo-resize:
-    description: Determines if the FIFO *has* to be reallocated
-    deprecated: true
+    description: Determines if the TX fifos can be dynamically resized depending
+      on the number of IN endpoints used and if bursting is supported.  This
+      may help improve bandwidth on platforms with higher system latencies, as
+      increased fifo space allows for the controller to prefetch data into its
+      internal memory.
     type: boolean
 
+  tx-fifo-max-num:
+    description: Specifies the max number of packets the txfifo resizing logic
+      can account for when higher endpoint bursting is used. (bMaxBurst > 6) The
+      higher the number, the more fifo space the txfifo resizing logic will
+      allocate for that endpoint.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 3
+
   snps,incr-burst-type-adjustment:
     description:
       Value for INCR burst type of GSBUSCFG0 register, undefined length INCR