1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/arm/vexpress-sysreg.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: ARM Versatile Express system registers 8 9maintainers: 10 - Andre Przywara <andre.przywara@arm.com> 11 12description: 13 This is a system control registers block, providing multiple low level 14 platform functions like board detection and identification, software 15 interrupt generation, MMC and NOR Flash control, etc. 16 17properties: 18 compatible: 19 const: arm,vexpress-sysreg 20 21 reg: 22 maxItems: 1 23 24 "#address-cells": 25 const: 1 26 27 "#size-cells": 28 const: 1 29 30 ranges: true 31 32 gpio-controller: 33 deprecated: true 34 35 "#gpio-cells": 36 deprecated: true 37 const: 2 38 39additionalProperties: false 40 41patternProperties: 42 '^gpio@[0-9a-f]+$': 43 type: object 44 additionalProperties: false 45 description: 46 GPIO children 47 48 properties: 49 compatible: 50 enum: 51 - arm,vexpress-sysreg,sys_led 52 - arm,vexpress-sysreg,sys_mci 53 - arm,vexpress-sysreg,sys_flash 54 55 gpio-controller: true 56 57 "#gpio-cells": 58 const: 2 59 description: | 60 The first cell is the function number: 61 for sys_led : 0..7 = LED 0..7 62 for sys_mci : 0 = MMC CARDIN, 1 = MMC WPROT 63 for sys_flash : 0 = NOR FLASH WPn 64 The second cell can take standard GPIO flags. 65 66 reg: 67 maxItems: 1 68 69 required: 70 - compatible 71 - reg 72 - gpio-controller 73 - "#gpio-cells" 74 75required: 76 - compatible 77 - reg 78 79examples: 80 - | 81 sysreg@0 { 82 compatible = "arm,vexpress-sysreg"; 83 reg = <0x00000 0x1000>; 84 #address-cells = <1>; 85 #size-cells = <1>; 86 ranges = <0 0 0x1000>; 87 88 v2m_led_gpios: gpio@8 { 89 compatible = "arm,vexpress-sysreg,sys_led"; 90 reg = <0x008 4>; 91 gpio-controller; 92 #gpio-cells = <2>; 93 }; 94 }; 95 96... 97