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+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/syscon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: System Controller Devices
+
+description: |
+  System controller node represents a register region containing a set
+  of miscellaneous registers. The registers are not cohesive enough to
+  represent as any specific type of device. The typical use-case is
+  for some other node's driver, or platform-specific code, to acquire
+  a reference to the syscon node (e.g. by phandle, node path, or
+  search using a specific compatible value), interrogate the node (or
+  associated OS driver) to determine the location of the registers,
+  and access the registers directly.
+
+maintainers:
+  - Lee Jones <lee@kernel.org>
+
+# Need a select with all compatibles listed for compatibility with older
+# dtschema (<2024.02), so this will not be selected for other schemas having
+# syscon fallback.
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - airoha,en7581-pbus-csr
+          - al,alpine-sysfabric-service
+          - allwinner,sun8i-a83t-system-controller
+          - allwinner,sun8i-h3-system-controller
+          - allwinner,sun8i-v3s-system-controller
+          - allwinner,sun50i-a64-system-controller
+          - altr,l3regs
+          - altr,sdr-ctl
+          - amd,pensando-elba-syscon
+          - amlogic,meson-mx-assist
+          - amlogic,meson-mx-bootrom
+          - amlogic,meson8-analog-top
+          - amlogic,meson8b-analog-top
+          - amlogic,meson8-pmu
+          - amlogic,meson8b-pmu
+          - apm,merlin-poweroff-mailbox
+          - apm,mustang-poweroff-mailbox
+          - apm,xgene-csw
+          - apm,xgene-efuse
+          - apm,xgene-mcb
+          - apm,xgene-rb
+          - apm,xgene-scu
+          - atmel,sama5d2-sfrbu
+          - atmel,sama5d3-nfc-io
+          - atmel,sama5d3-sfrbu
+          - atmel,sama5d4-sfrbu
+          - axis,artpec6-syscon
+          - brcm,cru-clkset
+          - brcm,sr-cdru
+          - brcm,sr-mhb
+          - cirrus,ep7209-syscon1
+          - cirrus,ep7209-syscon2
+          - cirrus,ep7209-syscon3
+          - cnxt,cx92755-uc
+          - freecom,fsg-cs2-system-controller
+          - fsl,imx93-aonmix-ns-syscfg
+          - fsl,imx93-wakeupmix-syscfg
+          - fsl,ls1088a-reset
+          - fsl,vf610-anatop
+          - fsl,vf610-mscm-cpucfg
+          - hisilicon,dsa-subctrl
+          - hisilicon,hi6220-sramctrl
+          - hisilicon,hip04-ppe
+          - hisilicon,pcie-sas-subctrl
+          - hisilicon,peri-subctrl
+          - hpe,gxp-sysreg
+          - loongson,ls1b-syscon
+          - loongson,ls1c-syscon
+          - lsi,axxia-syscon
+          - marvell,armada-3700-cpu-misc
+          - marvell,armada-3700-nb-pm
+          - marvell,armada-3700-avs
+          - marvell,armada-3700-usb2-host-device-misc
+          - marvell,armada-3700-usb2-host-misc
+          - marvell,dove-global-config
+          - mediatek,mt2701-pctl-a-syscfg
+          - mediatek,mt2712-pctl-a-syscfg
+          - mediatek,mt6397-pctl-pmic-syscfg
+          - mediatek,mt7981-topmisc
+          - mediatek,mt7988-topmisc
+          - mediatek,mt8135-pctl-a-syscfg
+          - mediatek,mt8135-pctl-b-syscfg
+          - mediatek,mt8173-pctl-a-syscfg
+          - mediatek,mt8365-syscfg
+          - microchip,lan966x-cpu-syscon
+          - microchip,mpfs-control-scb
+          - microchip,mpfs-sysreg-scb
+          - microchip,sam9x60-sfr
+          - microchip,sama7d65-ddr3phy
+          - microchip,sama7d65-sfrbu
+          - microchip,sama7g5-ddr3phy
+          - mscc,ocelot-cpu-syscon
+          - mstar,msc313-pmsleep
+          - nuvoton,ma35d1-sys
+          - nuvoton,wpcm450-shm
+          - qcom,apq8064-mmss-sfpb
+          - qcom,apq8064-sps-sic
+          - rockchip,px30-qos
+          - rockchip,rk3036-qos
+          - rockchip,rk3066-qos
+          - rockchip,rk3128-qos
+          - rockchip,rk3228-qos
+          - rockchip,rk3288-qos
+          - rockchip,rk3368-qos
+          - rockchip,rk3399-qos
+          - rockchip,rk3528-qos
+          - rockchip,rk3562-qos
+          - rockchip,rk3568-qos
+          - rockchip,rk3576-qos
+          - rockchip,rk3588-qos
+          - rockchip,rv1126-qos
+          - st,spear1340-misc
+          - stericsson,nomadik-pmu
+          - starfive,jh7100-sysmain
+          - ti,am62-opp-efuse-table
+          - ti,am62-usb-phy-ctrl
+          - ti,am625-dss-oldi-io-ctrl
+          - ti,am62p-cpsw-mac-efuse
+          - ti,am654-dss-oldi-io-ctrl
+          - ti,j784s4-acspcie-proxy-ctrl
+          - ti,j784s4-pcie-ctrl
+          - ti,keystone-pllctrl
+  required:
+    - compatible
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - airoha,en7581-pbus-csr
+              - al,alpine-sysfabric-service
+              - allwinner,sun8i-a83t-system-controller
+              - allwinner,sun8i-h3-system-controller
+              - allwinner,sun8i-v3s-system-controller
+              - allwinner,sun50i-a64-system-controller
+              - altr,l3regs
+              - altr,sdr-ctl
+              - amd,pensando-elba-syscon
+              - amlogic,meson-mx-assist
+              - amlogic,meson-mx-bootrom
+              - amlogic,meson8-analog-top
+              - amlogic,meson8b-analog-top
+              - amlogic,meson8-pmu
+              - amlogic,meson8b-pmu
+              - apm,merlin-poweroff-mailbox
+              - apm,mustang-poweroff-mailbox
+              - apm,xgene-csw
+              - apm,xgene-efuse
+              - apm,xgene-mcb
+              - apm,xgene-rb
+              - apm,xgene-scu
+              - atmel,sama5d2-sfrbu
+              - atmel,sama5d3-nfc-io
+              - atmel,sama5d3-sfrbu
+              - atmel,sama5d4-sfrbu
+              - axis,artpec6-syscon
+              - brcm,cru-clkset
+              - brcm,sr-cdru
+              - brcm,sr-mhb
+              - cirrus,ep7209-syscon1
+              - cirrus,ep7209-syscon2
+              - cirrus,ep7209-syscon3
+              - cnxt,cx92755-uc
+              - freecom,fsg-cs2-system-controller
+              - fsl,imx93-aonmix-ns-syscfg
+              - fsl,imx93-wakeupmix-syscfg
+              - fsl,ls1088a-reset
+              - fsl,vf610-anatop
+              - fsl,vf610-mscm-cpucfg
+              - hisilicon,dsa-subctrl
+              - hisilicon,hi6220-sramctrl
+              - hisilicon,hip04-ppe
+              - hisilicon,pcie-sas-subctrl
+              - hisilicon,peri-subctrl
+              - hpe,gxp-sysreg
+              - loongson,ls1b-syscon
+              - loongson,ls1c-syscon
+              - lsi,axxia-syscon
+              - marvell,armada-3700-cpu-misc
+              - marvell,armada-3700-nb-pm
+              - marvell,armada-3700-avs
+              - marvell,armada-3700-usb2-host-device-misc
+              - marvell,armada-3700-usb2-host-misc
+              - marvell,dove-global-config
+              - mediatek,mt2701-pctl-a-syscfg
+              - mediatek,mt2712-pctl-a-syscfg
+              - mediatek,mt6397-pctl-pmic-syscfg
+              - mediatek,mt7988-topmisc
+              - mediatek,mt8135-pctl-a-syscfg
+              - mediatek,mt8135-pctl-b-syscfg
+              - mediatek,mt8173-pctl-a-syscfg
+              - mediatek,mt8365-infracfg-nao
+              - mediatek,mt8365-syscfg
+              - microchip,lan966x-cpu-syscon
+              - microchip,mpfs-control-scb
+              - microchip,mpfs-sysreg-scb
+              - microchip,sam9x60-sfr
+              - microchip,sama7d65-ddr3phy
+              - microchip,sama7d65-sfrbu
+              - microchip,sama7g5-ddr3phy
+              - mscc,ocelot-cpu-syscon
+              - mstar,msc313-pmsleep
+              - nuvoton,ma35d1-sys
+              - nuvoton,wpcm450-shm
+              - qcom,apq8064-mmss-sfpb
+              - qcom,apq8064-sps-sic
+              - rockchip,px30-qos
+              - rockchip,rk3036-qos
+              - rockchip,rk3066-qos
+              - rockchip,rk3128-qos
+              - rockchip,rk3228-qos
+              - rockchip,rk3288-qos
+              - rockchip,rk3368-qos
+              - rockchip,rk3399-qos
+              - rockchip,rk3528-qos
+              - rockchip,rk3562-qos
+              - rockchip,rk3568-qos
+              - rockchip,rk3576-qos
+              - rockchip,rk3588-qos
+              - rockchip,rv1126-qos
+              - st,spear1340-misc
+              - stericsson,nomadik-pmu
+              - starfive,jh7100-sysmain
+              - ti,am62-opp-efuse-table
+              - ti,am62-usb-phy-ctrl
+              - ti,am625-dss-oldi-io-ctrl
+              - ti,am62p-cpsw-mac-efuse
+              - ti,am654-dss-oldi-io-ctrl
+              - ti,j784s4-acspcie-proxy-ctrl
+              - ti,j784s4-pcie-ctrl
+              - ti,keystone-pllctrl
+          - const: syscon
+      - items:
+          - enum:
+              - microchip,sama7g5-sfrbu
+              - microchip,sama7d65-sfrbu
+          - const: atmel,sama5d2-sfrbu
+          - const: syscon
+      - items:
+          - const: microchip,pic64gx-control-scb
+          - const: microchip,mpfs-control-scb
+          - const: syscon
+      - items:
+          - const: microchip,pic64gx-sysreg-scb
+          - const: microchip,mpfs-sysreg-scb
+          - const: syscon
+
+  reg:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: syscon-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    syscon: syscon@1c00000 {
+        compatible = "allwinner,sun8i-h3-system-controller", "syscon";
+        reg = <0x01c00000 0x1000>;
+    };
+...