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Message-ID: <20190430101230.21794-9-lokeshvutla@ti.com>
Date: Tue, 30 Apr 2019 15:42:24 +0530
From: Lokesh Vutla <lokeshvutla@...com>
To: Marc Zyngier <marc.zyngier@....com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Rob Herring <robh+dt@...nel.org>, Nishanth Menon <nm@...com>,
<tglx@...utronix.de>, <jason@...edaemon.net>
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>, Tony Lindgren <tony@...mide.com>,
<linus.walleij@...aro.org>, Peter Ujfalusi <peter.ujfalusi@...com>,
Grygorii Strashko <grygorii.strashko@...com>,
Lokesh Vutla <lokeshvutla@...com>,
Device Tree Mailing List <devicetree@...r.kernel.org>
Subject: [PATCH v8 08/14] 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 v7:
- Changes interrupt cells to 2.
.../interrupt-controller/ti,sci-intr.txt | 82 +++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 83 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..1a8718f8855d
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.txt
@@ -0,0 +1,82 @@
+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. An Interrupt Router can either handle edge triggered
+or level triggered interrupts and that is fixed in hardware.
+
+ Interrupt Router
+ +----------------------+
+ | Inputs Outputs |
+ +-------+ | +------+ +-----+ |
+ | GPIO |----------->| | irq0 | | 0 | | Host IRQ
+ +-------+ | +------+ +-----+ | controller
+ | . . | +-------+
+ +-------+ | . . |----->| IRQ |
+ | INTA |----------->| . . | +-------+
+ +-------+ | . +-----+ |
+ | +------+ | N | |
+ | | irqM | +-----+ |
+ | +------+ |
+ | |
+ +----------------------+
+
+There is one register per output (MUXCNTL_N) that controls the selection.
+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:
+----------------------------
+Required Properties:
+- compatible: Must be "ti,sci-intr".
+- ti,intr-trigger-type: Should be one of the following:
+ 1: If intr supports edge triggered interrupts.
+ 4: If intr supports level triggered interrupts.
+- 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 2.
+ First cell should contain the TISCI device ID of source
+ Second cell should contain the interrupt source offset
+ within the device.
+- 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: Array of TISCI subtype ids representing the host irqs
+ assigned to this interrupt router. Each subtype id
+ corresponds to a range of host irqs.
+
+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-controller0 {
+ compatible = "ti,sci-intr";
+ ti,intr-trigger-type = <1>;
+ interrupt-controller;
+ interrupt-parent = <&gic500>;
+ #interrupt-cells = <2>;
+ 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>, <57 257>, <57 258>,
+ <57 259>, <57 260>, <57 261>;
+ ...
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 5c38f21aee78..91b4dcfb47f4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15350,6 +15350,7 @@ 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
Texas Instruments ASoC drivers
M: Peter Ujfalusi <peter.ujfalusi@...com>
--
2.21.0
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