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Message-ID: <20190212074237.2875-8-lokeshvutla@ti.com>
Date: Tue, 12 Feb 2019 13:12:34 +0530
From: Lokesh Vutla <lokeshvutla@...com>
To: <marc.zyngier@....com>, Tony Lindgren <tony@...mide.com>,
Nishanth Menon <nm@...com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Rob Herring <robh+dt@...nel.org>, <tglx@...utronix.de>,
<jason@...edaemon.net>
CC: Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
Device Tree Mailing List <devicetree@...r.kernel.org>,
Sekhar Nori <nsekhar@...com>, Tero Kristo <t-kristo@...com>,
Peter Ujfalusi <peter.ujfalusi@...com>,
Lokesh Vutla <lokeshvutla@...com>
Subject: [PATCH v5 07/10] dt-bindings: irqchip: Introduce TISCI Interrupt Aggregator bindings
Add the DT binding documentation for Interrupt Aggregator driver.
Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
---
Changes sine v4:
- None
.../interrupt-controller/ti,sci-inta.txt | 74 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 75 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt
diff --git a/Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt
new file mode 100644
index 000000000000..17b1fbd90312
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt
@@ -0,0 +1,74 @@
+Texas Instruments K3 Interrupt Aggregator
+=========================================
+
+The Interrupt Aggregator (INTA) provides a centralized machine
+which handles the termination of system events to that they can
+be coherently processed by the host(s) in the system. A maximum
+of 64 events can be mapped to a single interrupt.
+
+
+ Interrupt Aggregator
+ +-----------------------------------------+
+ | Intmap VINT |
+ | +--------------+ +------------+ |
+ m ------>| | vint | bit | | 0 |.....|63| vint0 |
+ . | +--------------+ +------------+ | +------+
+ . | . . | | HOST |
+Globalevents ------>| . . |------>| IRQ |
+ . | . . | | CTRL |
+ . | . . | +------+
+ n ------>| +--------------+ +------------+ |
+ | | vint | bit | | 0 |.....|63| vintx |
+ | +--------------+ +------------+ |
+ | |
+ +-----------------------------------------+
+
+Configuration of these Intmap registers that maps global events to vint is done
+by a system controller (like the Device Memory and Security Controller on K3
+AM654 SoC). Driver should request the system controller to get the range
+of global events and vints assigned to the requesting host. Management
+of these requested resources should be handled by driver and requests
+system controller to map specific global event to vint, bit pair.
+
+Communication between the host processor running an OS and the system
+controller happens through a protocol called TI System Control Interface
+(TISCI protocol). For more details refer:
+Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
+
+TISCI Interrupt Aggregator Node:
+-------------------------------
+- compatible: Must be "ti,sci-inta".
+- reg: Should contain registers location and length.
+- interrupt-controller: Identifies the node as an interrupt controller
+- #interrupt-cells: Specifies the number of cells needed to encode an
+ interrupt source. The value should be 4.
+ First cell should contain the TISCI device ID of source
+ Second cell should contain the event source offset
+ within the device
+ Third cell specified the interrupt number(vint)
+ reaching Interrupt aggregator.
+ Fourth cell specifies the trigger type as defined
+ in interrupts.txt in this directory.
+- interrupt-parent: phandle of irq parent for TISCI intr.
+- ti,sci: Phandle to TI-SCI compatible System controller node.
+- ti,sci-dev-id: TISCI device ID of the Interrupt Aggregator.
+- ti,sci-rm-range-vint: TISCI subtype id representing the virtual interrupts
+ (vints) range within this IA, assigned to the
+ requesting host context.
+- ti,sci-rm-range-global-event: TISCI subtype id representing the global
+ events range reaching this IA and are assigned
+ to the requesting host context.
+
+Example:
+--------
+main_udmass_inta: interrupt-controller@...00000 {
+ compatible = "ti,sci-inta";
+ reg = <0x0 0x33d00000 0x0 0x100000>;
+ interrupt-controller;
+ interrupt-parent = <&main_navss_intr>;
+ #interrupt-cells = <4>;
+ ti,sci = <&dmsc>;
+ ti,sci-dev-id = <179>;
+ ti,sci-rm-range-vint = <0x0>;
+ ti,sci-rm-range-global-event = <0x1>;
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 823eeb672cf0..970c732b7158 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15065,6 +15065,7 @@ F: Documentation/devicetree/bindings/clock/ti,sci-clk.txt
F: drivers/clk/keystone/sci-clk.c
F: drivers/reset/reset-ti-sci.c
F: Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
+F: Documentation/devicetree/bindings/interrupt-controller/ti,sci-inta.txt
F: drivers/irqchip/irq-ti-sci-intr.c
F: drivers/irqchip/irq-ti-sci-common.c
F: drivers/irqchip/irq-ti-sci-common.h
--
2.19.2
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