linux-kernel - [PATCH 1/2] dt-bindings: usb: dwc3: Add system bus request info

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Date: Tue, 23 Jan 2024 12:02:05 -0500
From: Frank Li <Frank.Li@....com>
To: thinh.nguyen@...opsys.com,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: Frank.Li@....com,
	balbi@...nel.org,
	devicetree@...r.kernel.org,
	gregkh@...uxfoundation.org,
	imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	mark.rutland@....com,
	mathias.nyman@...el.com,
	pku.leo@...il.com,
	sergei.shtylyov@...entembedded.com
Subject: [PATCH 1/2] dt-bindings: usb: dwc3: Add system bus request info

Add device tree binding allow platform overwrite default value of *REQIN in
GSBUSCFG0.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 .../devicetree/bindings/usb/snps,dwc3.yaml    | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 8f5d250070c78..43e7fea3f6798 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -439,6 +439,42 @@ properties:
     items:
       enum: [1, 4, 8, 16, 32, 64, 128, 256]
 
+  snps,des-wr-reqinfo:
+    description: Value for DESEWRREQIN of GSBUSCFG0 register.
+      ----------------------------------------------------------------
+       MBUS_TYPE| bit[3]       |bit[2]       |bit[1]     |bit[0]
+      ----------------------------------------------------------------
+       AHB      |Cacheable     |Bufferable   |Privilegge |Data
+       AXI3     |Write Allocate|Read Allocate|Cacheable  |Bufferable
+       AXI4     |Allocate Other|Allocate     |Modifiable |Bufferable
+       AXI4     |Other Allocate|Allocate     |Modifiable |Bufferable
+       Native   |Same as AXI   |Same as AXI  |Same as AXI|Same as AXI
+      ----------------------------------------------------------------
+      The AHB, AXI3, AXI4, and PCIe busses use different names for certain
+      signals, which have the same meaning:
+      Bufferable = Posted
+      Cacheable = Modifiable = Snoop (negation of No Snoop)
+    $ref: /schemas/types.yaml#/definitions/uint8
+    maxItem: 15
+
+  snps,des-rd-reqinfo:
+    description: Value for DESRDREQIN of GSBUSCFG0 register. ref
+      snps,des-wr-reqinfo
+    $ref: /schemas/types.yaml#/definitions/uint8
+    maxItem: 15
+
+  snps,dat-wr-reqinfo:
+    description: Value for DATWRREQIN of GSBUSCFG0 register. ref
+      snps,des-wr-reqinfo
+    $ref: /schemas/types.yaml#/definitions/uint8
+    maxItem: 15
+
+  snps,des-wr-reqinfo:
+    description: Value for DATWRREQIN of GSBUSCFG0 register. ref
+      snps,des-wr-reqinfo
+    $ref: /schemas/types.yaml#/definitions/uint8
+    maxItem: 15
+
   num-hc-interrupters:
     maximum: 8
     default: 1
-- 
2.34.1