From: Conor Dooley Date: Wed, 18 Mar 2026 11:04:34 +0000 (+0000) Subject: dt-bindings: soc: microchip: document PolarFire SoC's gpio interrupt mux X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f3575cc73dc64dc0912d1f8ccf6d00c20aedd5b;p=thirdparty%2Fkernel%2Flinux.git dt-bindings: soc: microchip: document PolarFire SoC's gpio interrupt mux On PolarFire SoC there are more GPIO interrupts than there are interrupt lines available on the PLIC, and a runtime configurable mux is used to decide which interrupts are assigned direct connections to the PLIC & which are relegated to sharing a line. Reviewed-by: Herve Codina Reviewed-by: Rob Herring (Arm) Reviewed-by: Linus Walleij Signed-off-by: Conor Dooley --- diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-irqmux.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-irqmux.yaml new file mode 100644 index 000000000000..51164772724f --- /dev/null +++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-irqmux.yaml @@ -0,0 +1,103 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soc/microchip/microchip,mpfs-irqmux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Microchip Polarfire SoC GPIO Interrupt Mux + +maintainers: + - Conor Dooley + +description: | + There are 3 GPIO controllers on this SoC, of which: + - GPIO controller 0 has 14 GPIOs + - GPIO controller 1 has 24 GPIOs + - GPIO controller 2 has 32 GPIOs + + All GPIOs are capable of generating interrupts, for a total of 70. + There are only 41 IRQs available however, so a configurable mux is used to + ensure all GPIOs can be used for interrupt generation. + 38 of the 41 interrupts are in what the documentation calls "direct mode", + as they provide an exclusive connection from a GPIO to the PLIC. + Lines 18 to 23 on GPIO controller 1 are always in "direct mode". + The 3 remaining interrupts are used to mux the interrupts which do not have + a exclusive connection, one for each GPIO controller. + +properties: + compatible: + const: microchip,mpfs-irqmux + + reg: + maxItems: 1 + + "#address-cells": + const: 0 + + "#interrupt-cells": + const: 1 + + interrupt-map-mask: + items: + - const: 0x7f + + interrupt-map: + description: | + Specifies the mapping from GPIO interrupt lines to plic interrupts. + + The child interrupt number set in arrays items is computed using the + following formula: + gpio_bank * 32 + gpio_number + with: + - gpio_bank: The GPIO bank number + - 0 for GPIO0, + - 1 for GPIO1, + - 2 for GPIO2 + - gpio_number: Number of the gpio in the bank (0..31) + maxItems: 70 + +required: + - compatible + - reg + - "#address-cells" + - "#interrupt-cells" + - interrupt-map-mask + - interrupt-map + +additionalProperties: false + +examples: + - | + interrupt-controller@54 { + compatible = "microchip,mpfs-irqmux"; + reg = <0x54 0x4>; + #address-cells = <0>; + #interrupt-cells = <1>; + interrupt-map-mask = <0x7f>; + interrupt-map = <0 &plic 13>, <1 &plic 14>, <2 &plic 15>, + <3 &plic 16>, <4 &plic 17>, <5 &plic 18>, + <6 &plic 19>, <7 &plic 20>, <8 &plic 21>, + <9 &plic 22>, <10 &plic 23>, <11 &plic 24>, + <12 &plic 25>, <13 &plic 26>, + + <32 &plic 27>, <33 &plic 28>, <34 &plic 29>, + <35 &plic 30>, <36 &plic 31>, <37 &plic 32>, + <38 &plic 33>, <39 &plic 34>, <40 &plic 35>, + <41 &plic 36>, <42 &plic 37>, <43 &plic 38>, + <44 &plic 39>, <45 &plic 40>, <46 &plic 41>, + <47 &plic 42>, <48 &plic 43>, <49 &plic 44>, + <50 &plic 45>, <51 &plic 46>, <52 &plic 47>, + <53 &plic 48>, <54 &plic 49>, <55 &plic 50>, + + <64 &plic 53>, <65 &plic 53>, <66 &plic 53>, + <67 &plic 53>, <68 &plic 53>, <69 &plic 53>, + <70 &plic 53>, <71 &plic 53>, <72 &plic 53>, + <73 &plic 53>, <74 &plic 53>, <75 &plic 53>, + <76 &plic 53>, <77 &plic 53>, <78 &plic 53>, + <79 &plic 53>, <80 &plic 53>, <81 &plic 53>, + <82 &plic 53>, <83 &plic 53>, <84 &plic 53>, + <85 &plic 53>, <86 &plic 53>, <87 &plic 53>, + <88 &plic 53>, <89 &plic 53>, <90 &plic 53>, + <91 &plic 53>, <92 &plic 53>, <93 &plic 53>, + <94 &plic 53>, <95 &plic 53>; + }; diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml index 2c1efcdf59b7..1e3725335b2c 100644 --- a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml +++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml @@ -44,6 +44,10 @@ properties: of PolarFire clock/reset IDs. const: 1 + interrupt-controller@54: + type: object + $ref: /schemas/soc/microchip/microchip,mpfs-irqmux.yaml + pinctrl@200: type: object $ref: /schemas/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml