linux-kernel - [PATCH RFC 2/4] dt-bindings/interrupt-controller: pdc: descibe PDC device binding

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Message-Id: <20180123175656.11942-3-ilina@codeaurora.org>
Date:   Tue, 23 Jan 2018 10:56:54 -0700
From:   Lina Iyer <ilina@...eaurora.org>
To:     tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        asathyak@...eaurora.org, Lina Iyer <ilina@...eaurora.org>,
        devicetree@...r.kernel.org
Subject: [PATCH RFC 2/4] dt-bindings/interrupt-controller: pdc: descibe PDC device binding

From: Archana Sathyakumar <asathyak@...eaurora.org>

Add device binding documentation for the PDC Interrupt controller on
QCOM SoC's like the SDM845. The interrupt-controller can be used to
sense edge low interrupts and wakeup interrupts when the GIC is
non-operational.

Cc: devicetree@...r.kernel.org
Signed-off-by: Archana Sathyakumar <asathyak@...eaurora.org>
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---
 .../bindings/interrupt-controller/qcom,pdc.txt     | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt b/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt
new file mode 100644
index 000000000000..c4592bbf678d
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt
@@ -0,0 +1,55 @@
+PDC interrupt controller
+
+Qualcomm Technologies Inc. SoCs based on the RPM Hardened archicture have a
+Power Domain Controller (PDC) that is on always-on domain. In addition to
+providing power control for the power domains, the hardware also has an
+interrupt controller that can be used to help detect edge low interrupts as
+well detect interrupts when the GIC is non-operational.
+
+GIC is parent interrupt controller at the highest level. Platform interrupt
+controller PDC is next in hierarchy, followed by others. This driver only
+configures the interrupts, does not handle them.
+
+Properties:
+
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: Should contain "qcom,pdc" and "qcom,pdc-<target>"
+		    - "qcom,pdc-sdm845": For sdm845 pin data
+
+- reg:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: Specifies the base physical address for PDC hardware.
+
+- interrupt-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: Specifies the number of cells needed to encode an interrupt
+		    source.
+		    Value must be 3.
+		    The encoding of these cells are same as described in [1].
+
+- interrupt-parent:
+	Usage: required
+	Value type: <phandle>
+	Definition: Specifies the interrupt parent necessary for hierarchical
+		    domain to operate.
+
+- interrupt-controller:
+	Usage: required
+	Value type: <bool>
+	Definition: Identifies the node as an interrupt controller.
+
+Example:
+
+	pdc: interrupt-controller@...0000 {
+		compatible = "qcom,pdc", "qcom,pdc-sdm845";
+		reg = <0xb220000 0x30000>;
+		#interrupt-cells = <3>;
+		interrupt-parent = <&intc>;
+		interrupt-controller;
+	};
+
+[1]. Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
-- 
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