1# SPDX-License-Identifier: GPL-2.0 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/i2c/i2c-rk3x.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: Rockchip RK3xxx I2C controller 8 9description: 10 This driver interfaces with the native I2C controller present in Rockchip 11 RK3xxx SoCs. 12 13allOf: 14 - $ref: /schemas/i2c/i2c-controller.yaml# 15 16maintainers: 17 - Heiko Stuebner <heiko@sntech.de> 18 19# Everything else is described in the common file 20properties: 21 compatible: 22 oneOf: 23 - const: rockchip,rv1108-i2c 24 - const: rockchip,rk3066-i2c 25 - const: rockchip,rk3188-i2c 26 - const: rockchip,rk3228-i2c 27 - const: rockchip,rk3288-i2c 28 - const: rockchip,rk3399-i2c 29 - items: 30 - enum: 31 - rockchip,rk3036-i2c 32 - rockchip,rk3368-i2c 33 - const: rockchip,rk3288-i2c 34 - items: 35 - enum: 36 - rockchip,px30-i2c 37 - rockchip,rk3308-i2c 38 - rockchip,rk3328-i2c 39 - rockchip,rk3568-i2c 40 - rockchip,rk3588-i2c 41 - const: rockchip,rk3399-i2c 42 43 reg: 44 maxItems: 1 45 46 interrupts: 47 maxItems: 1 48 49 clocks: 50 minItems: 1 51 items: 52 - description: 53 For older hardware (rk3066, rk3188, rk3228, rk3288) 54 there is one clock that is used both to derive the functional clock 55 for the device and as the bus clock. 56 For newer hardware (rk3399) this clock is used to derive 57 the functional clock 58 - description: 59 For newer hardware (rk3399) this is the bus clock 60 61 clock-names: 62 minItems: 1 63 items: 64 - const: i2c 65 - const: pclk 66 67 rockchip,grf: 68 $ref: /schemas/types.yaml#/definitions/phandle 69 description: 70 Required on RK3066, RK3188 the phandle of the syscon node for 71 the general register file (GRF) 72 On those SoCs an alias with the correct I2C bus ID 73 (bit offset in the GRF) is also required. 74 75 clock-frequency: 76 default: 100000 77 description: 78 SCL frequency to use (in Hz). If omitted, 100kHz is used. 79 80 i2c-scl-rising-time-ns: 81 default: 1000 82 description: 83 Number of nanoseconds the SCL signal takes to rise 84 (t(r) in I2C specification). If not specified this is assumed to be 85 the maximum the specification allows(1000 ns for Standard-mode, 86 300 ns for Fast-mode) which might cause slightly slower communication. 87 88 i2c-scl-falling-time-ns: 89 default: 300 90 description: 91 Number of nanoseconds the SCL signal takes to fall 92 (t(f) in the I2C specification). If not specified this is assumed to 93 be the maximum the specification allows (300 ns) which might cause 94 slightly slower communication. 95 96 i2c-sda-falling-time-ns: 97 default: 300 98 description: 99 Number of nanoseconds the SDA signal takes to fall 100 (t(f) in the I2C specification). If not specified we will use the SCL 101 value since they are the same in nearly all cases. 102 103required: 104 - compatible 105 - reg 106 - interrupts 107 - clocks 108 - clock-names 109 110if: 111 properties: 112 compatible: 113 contains: 114 enum: 115 - rockchip,rk3066-i2c 116 - rockchip,rk3188-i2c 117 118then: 119 required: 120 - rockchip,grf 121 122unevaluatedProperties: false 123 124examples: 125 - | 126 #include <dt-bindings/clock/rk3188-cru-common.h> 127 #include <dt-bindings/interrupt-controller/arm-gic.h> 128 #include <dt-bindings/interrupt-controller/irq.h> 129 i2c0: i2c@2002d000 { 130 compatible = "rockchip,rk3188-i2c"; 131 reg = <0x2002d000 0x1000>; 132 interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>; 133 clocks = <&cru PCLK_I2C0>; 134 clock-names = "i2c"; 135 rockchip,grf = <&grf>; 136 i2c-scl-falling-time-ns = <100>; 137 i2c-scl-rising-time-ns = <800>; 138 #address-cells = <1>; 139 #size-cells = <0>; 140 }; 141