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Message-ID: <20181106084105.32483-7-lokeshvutla@ti.com>
Date: Tue, 6 Nov 2018 14:10:58 +0530
From: Lokesh Vutla <lokeshvutla@...com>
To: Nishanth Menon <nm@...com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Rob Herring <robh+dt@...nel.org>, <tglx@...utronix.de>,
<jason@...edaemon.net>, <marc.zyngier@....com>
CC: Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, Tero Kristo <t-kristo@...com>,
Sekhar Nori <nsekhar@...com>,
Device Tree Mailing List <devicetree@...r.kernel.org>,
Grygorii Strashko <grygorii.strashko@...com>,
Peter Ujfalusi <peter.ujfalusi@...com>,
Lokesh Vutla <lokeshvutla@...com>
Subject: [PATCH v3 06/13] dt-bindings: irqchip: Introduce TISCI Interrupt router bindings
Add the DT binding documentation for Interrupt router driver.
Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
---
Changes since v2:
- Dropped interrupt-parent from reqired properties description
- Updated the interrupt cells to 4.
.../interrupt-controller/ti,sci-intr.txt | 84 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 85 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
diff --git a/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
new file mode 100644
index 000000000000..06e69f8c812c
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
@@ -0,0 +1,84 @@
+Texas Instruments K3 Interrupt Router
+=====================================
+
+The Interrupt Router (INTR) module provides a mechanism to mux M
+interrupt inputs to N interrupt outputs, where all M inputs are selectable
+to be driven per N output. There is one register per output (MUXCNTL_N) that
+controls the selection.
+
+
+ Interrupt Router
+ +----------------------+
+ | Inputs Outputs |
+ +-------+ | +------+ |
+ | GPIO |----------->| | irq0 | | Host IRQ
+ +-------+ | +------+ | controller
+ | . +-----+ | +-------+
+ +-------+ | . | 0 | |----->| IRQ |
+ | INTA |----------->| . +-----+ | +-------+
+ +-------+ | . . |
+ | +------+ . |
+ | | irqM | +-----+ |
+ | +------+ | N | |
+ | +-----+ |
+ +----------------------+
+
+Configuration of these MUXCNTL_N registers is done by a system controller
+(like the Device Memory and Security Controller on K3 AM654 SoC). System
+controller will keep track of the used and unused registers within the Router.
+Driver should request the system controller to get the range of GIC IRQs
+assigned to the requesting hosts. It is the drivers responsibility to keep
+track of Host IRQs.
+
+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 Router Node:
+----------------------------
+- compatible: Must be "ti,sci-intr".
+- 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 interrupt source offset
+ within the device
+ Third cell specifies the trigger type as defined
+ in interrupts.txt in this directory.
+ Fourth cell should be 1 if the irq is coming from
+ interrupt aggregator else 0.
+- ti,sci: Phandle to TI-SCI compatible System controller node.
+- ti,sci-dst-id: TISCI device ID of the destination IRQ controller.
+- ti,sci-rm-range-girq: TISCI subtype id representing the host irqs assigned
+ to this interrupt router.
+
+For more details on TISCI IRQ resource management refer:
+http://downloads.ti.com/tisci/esd/latest/2_tisci_msgs/rm/rm_irq.html
+
+Example:
+--------
+The following example demonstrates both interrupt router node and the consumer
+node(main gpio) on the AM654 SoC:
+
+main_intr: interrupt-controller@1 {
+ compatible = "ti,sci-intr";
+ interrupt-controller;
+ interrupt-parent = <&gic>;
+ #interrupt-cells = <4>;
+ ti,sci = <&dmsc>;
+ ti,sci-dst-id = <56>;
+ ti,sci-rm-range-girq = <0x1>;
+};
+
+main_gpio0: gpio@...000 {
+ ...
+ interrupt-parent = <&main_intr>;
+ interrupts = <57 256 IRQ_TYPE_EDGE_RISING 0>,
+ <57 257 IRQ_TYPE_EDGE_RISING 0>,
+ <57 258 IRQ_TYPE_EDGE_RISING 0>,
+ <57 259 IRQ_TYPE_EDGE_RISING 0>,
+ <57 260 IRQ_TYPE_EDGE_RISING 0>,
+ <57 261 IRQ_TYPE_EDGE_RISING 0>;
+ ...
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 88b28f6dec45..0e3aa3386287 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14739,6 +14739,7 @@ F: Documentation/devicetree/bindings/reset/ti,sci-reset.txt
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
THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
M: Hans Verkuil <hverkuil@...all.nl>
--
2.19.1
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