linux-kernel - [PATCH v6 13/33] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition

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Message-ID: <20230916001026.315-14-quic_wcheng@quicinc.com>
Date:   Fri, 15 Sep 2023 17:10:06 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <srinivas.kandagatla@...aro.org>, <bgoswami@...cinc.com>,
        <Thinh.Nguyen@...opsys.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v6 13/33] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition

Add a new definition for specifying how many XHCI secondary interrupters
can be allocated.  XHCI in general can potentially support up to 1024
interrupters, which some uses may want to limit depending on how many
users utilize the interrupters.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 .../devicetree/bindings/usb/snps,dwc3.yaml          | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index a696f23730d3..596762ef9b9f 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -376,6 +376,19 @@ properties:
     items:
       enum: [1, 4, 8, 16, 32, 64, 128, 256]
 
+  snps,num-hc-interrupters:
+    description:
+      Defines the maximum number of XHCI host controller interrupters that can
+      be supported.  The XHCI host controller has support to allocate multiple
+      event rings, which can be assigned to different clients/users.  The DWC3
+      controller has a maximum of 8 interrupters.  If this is not defined then
+      the value will be defaulted to 1.  This parameter is used only when
+      operating in host mode.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 1
+    maximum: 8
+    default: 1
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
     description: