linux-kernel - [PATCH v2 2/2] dt-bindings: usb: snps,dwc3: Add 'snps,global-regs-starting-offset' quirk

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Date:   Thu, 13 Apr 2023 12:25:03 +0800
From:   Stanley Chang <stanley_chang@...ltek.com>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>
CC:     Stanley Chang <stanley_chang@...ltek.com>,
        <linux-usb@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        "Krzysztof Kozlowski" <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Felipe Balbi <balbi@...nel.org>
Subject: [PATCH v2 2/2] dt-bindings: usb: snps,dwc3: Add 'snps,global-regs-starting-offset' quirk

Add a new 'snps,global-regs-starting-offset' DT to dwc3 core to remap
the global register start address

The RTK DHC SoCs were designed the global register address offset at
0x8100. The default address is at DWC3_GLOBALS_REGS_START (0xc100).
Therefore, add the property of device-tree to adjust this start address.

Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
---
 v1 to v2 change:
1. Change the name of the property "snps,global-regs-starting-offset".
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index be36956af53b..5cbf3b7ded04 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -359,6 +359,13 @@ properties:
     items:
       enum: [1, 4, 8, 16, 32, 64, 128, 256]
 
+  snps,global-regs-starting-offset:
+    description:
+      value for remapping global register start address. For some dwc3
+      controller, the dwc3 global register start address is not at
+      default DWC3_GLOBALS_REGS_START (0xc100). This property is added to
+      adjust the address.
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
     description:
-- 
2.34.1