From e85cbe8b34147126cdd5dab09f4c745157f6083c Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 6 Feb 2020 09:55:01 -0700 Subject: 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 Reviewed-by: Bin Meng --- .../interrupt-controller/intel,acpi-gpe.txt | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 doc/device-tree-bindings/interrupt-controller/intel,acpi-gpe.txt (limited to 'doc/device-tree-bindings/interrupt-controller') 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 00000000000..d9252bf29f7 --- /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 = ; + 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>; + }; -- cgit v1.2.3