x86: Add support for ACPI general-purpose events
ACPI GPEs are used to signal interrupts from peripherals that are accessed
via ACPI. In U-Boot these are modelled as interrupts using a separate
interrupt controller. Configuration is via the device tree.
Add a simple driver for this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/doc/device-tree-bindings/interrupt-controller/intel,acpi-gpe.txt b/doc/device-tree-bindings/interrupt-controller/intel,acpi-gpe.txt
new file mode 100644
index 0000000..d9252bf
--- /dev/null
+++ b/doc/device-tree-bindings/interrupt-controller/intel,acpi-gpe.txt
@@ -0,0 +1,30 @@
+* Intel Advanced Configuration and Power Interface General Purpose Events
+
+This describes an interrupt controller which provides access to GPEs supported
+by the SoC.
+
+Required properties:
+
+- compatible : "intel,acpi-gpe"
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : The number of cells to define the interrupts. Must be 2:
+ cell 0: interrupt number (normally >=32 since GPEs below that are reserved)
+ cell 1: 0 (flags, but none are currently defined)
+- reg : The register bank for the controller (set this to the ACPI base).
+
+Example:
+
+ general-purpose-events {
+ reg = <IOMAP_ACPI_BASE IOMAP_ACPI_SIZE>;
+ compatible = "intel,acpi-gpe";
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
+
+ ...
+ tpm@50 {
+ reg = <0x50>;
+ compatible = "google,cr50";
+ ready-gpio = <&gpio_n 0x1c GPIO_ACTIVE_LOW>;
+ interrupts-extended = <&acpi_gpe 0x3c 0>;
+ };