From: Lina Iyer <ilina-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
To: tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org,
jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org,
marc.zyngier-5wv7dgnIgG8@public.gmane.org
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
rnayak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
asathyak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
Lina Iyer <ilina-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH RFC v2 2/3] dt-bindings/interrupt-controller: pdc: descibe PDC device binding
Date: Fri, 2 Feb 2018 07:21:59 -0700 [thread overview]
Message-ID: <20180202142200.6229-3-ilina@codeaurora.org> (raw)
In-Reply-To: <20180202142200.6229-1-ilina-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
From: Archana Sathyakumar <asathyak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.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-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Archana Sathyakumar <asathyak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Signed-off-by: Lina Iyer <ilina-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
.../bindings/interrupt-controller/qcom,pdc.txt | 78 ++++++++++++++++++++++
1 file changed, 78 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..7bf40cb6a4f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt
@@ -0,0 +1,78 @@
+PDC interrupt controller
+
+Qualcomm Technologies Inc. SoCs based on the RPM Hardened architecture 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. Drivers requiring
+wakeup capabilities of their device interrupts routed through the PDC, must
+specify PDC as their interrupt controller and request the PDC port associated
+with the GIC interrupt. See example below.
+
+Properties:
+
+- compatible:
+ Usage: required
+ Value type: <string>
+ Definition: Should contain "qcom,<soc>-pdc"
+ - "qcom,sdm845-pdc": For SDM845
+
+- 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.
+ The value must match that of the parent interrupt
+ controller defined in the DT.
+ 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.
+
+- qcom,pdc-range:
+ Usage: required
+ Value type: <u32 array>
+ Definition: Specifies the PDC pin offset and the number of PDC ports.
+ The tuples indicates the valid mapping of valid PDC ports
+ and their hwirq mapping.
+ The first element of the tuple is the staring PDC port num.
+ The second element is the hwirq number for the PDC port.
+ The third element is the number of elements in sequence.
+
+Example:
+
+ pdc: interrupt-controller@b220000 {
+ compatible = "qcom,sdm845-pdc";
+ reg = <0xb220000 0x30000>;
+ qcom,pdc-ranges = <0 512 94>, <94 641 15>, <115 662 7>;
+ #interrupt-cells = <3>;
+ interrupt-parent = <&intc>;
+ interrupt-controller;
+ };
+
+The DT binding of a device that wants to use the GIC SPI 514 as a wakeup
+interrupt, would look like this -
+
+ wake-device {
+ [...]
+ interrupt-parent = <&pdc>;
+ interrupt = <0 2 0>;
+ };
+
+[1]. Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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next parent reply other threads:[~2018-02-02 14:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180202142200.6229-1-ilina@codeaurora.org>
[not found] ` <20180202142200.6229-1-ilina-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-02-02 14:21 ` Lina Iyer [this message]
2018-02-02 16:28 ` [PATCH RFC v2 2/3] dt-bindings/interrupt-controller: pdc: descibe PDC device binding Marc Zyngier
[not found] ` <396cfc2f-7deb-0c93-7178-d9f5524f110e-5wv7dgnIgG8@public.gmane.org>
2018-02-02 16:46 ` Lina Iyer
2018-02-02 17:02 ` Marc Zyngier
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