linux-kernel - [PATCH v2 1/2] dt-bindings: Documentation for qcom,eud

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Message-Id: <1536096853-30473-2-git-send-email-pheragu@codeaurora.org>
Date:   Tue,  4 Sep 2018 14:34:12 -0700
From:   Prakruthi Deepak Heragu <pheragu@...eaurora.org>
To:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, ckadabi@...eaurora.org,
        tsoni@...eaurora.org, rnayak@...eaurora.org, bryanh@...eaurora.org,
        psodagud@...eaurora.org,
        Prakruthi Deepak Heragu <pheragu@...eaurora.org>,
        Satya Durga Srinivasu Prabhala <satyap@...eaurora.org>
Subject: [PATCH v2 1/2] dt-bindings: Documentation for qcom,eud

Documentation for Embedded USB Debugger (EUD) device tree bindings.

Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@...eaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@...eaurora.org>
---
 .../devicetree/bindings/soc/qcom/qcom,msm-eud.txt  | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt

diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt
new file mode 100644
index 0000000..a03021a
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,msm-eud.txt
@@ -0,0 +1,41 @@
+* Qualcomm Technologies Inc Embedded USB Debugger (EUD)
+
+The EUD (Embedded USB Debugger) is a mini-USB hub implemented
+on chip to support the USB-based debug and trace capabilities.
+
+Required properties:
+
+ - compatible:  Should be "qcom,msm-eud"
+ - interrupts:  Interrupt number
+ - reg: Should be address and size of EUD register space
+
+Driver notifies clients for VBUS attach/detach and charger enable/disable
+events. The link between client and EUD is established via a directed
+graph. EUD driver has one endpoint of the graph link mentioning EUD as an
+output link and clients registered for these notifications from the EUD
+should have the other endpoint of the graph link as an input link. Each of
+these endpoints should contain a 'remote-endpoint' phandle property that
+points to the corresponding endpoint in the port of the remote device.
+
+An example for EUD device node:
+
+	eud: qcom,msm-eud@...0000 {
+		compatible = "qcom,msm-eud";
+		interrupts = <GIC_SPI 492 IRQ_TYPE_LEVEL_HIGH>;
+		reg = <0x88e0000 0x4000>;
+		port {
+                	eud_output: endpoint {
+                        	remote-endpoint = <&usb3_input>;
+                        };
+        	};
+	};
+
+An example for EUD client:
+
+	usb3 {
+		port {
+                	usb3_input: endpoint {
+                        	remote-endpoint = <&eud_output>;
+                        };
+        	};
+	};
-- 
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a Linux Foundation Collaborative Project