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,rk3128-i2c 33 - rockchip,rk3368-i2c 34 - const: rockchip,rk3288-i2c 35 - items: 36 - enum: 37 - rockchip,px30-i2c 38 - rockchip,rk3308-i2c 39 - rockchip,rk3328-i2c 40 - rockchip,rk3568-i2c 41 - rockchip,rk3588-i2c 42 - rockchip,rv1126-i2c 43 - const: rockchip,rk3399-i2c 44 45 reg: 46 maxItems: 1 47 48 interrupts: 49 maxItems: 1 50 51 clocks: 52 minItems: 1 53 items: 54 - description: 55 For older hardware (rk3066, rk3188, rk3228, rk3288) 56 there is one clock that is used both to derive the functional clock 57 for the device and as the bus clock. 58 For newer hardware (rk3399) this clock is used to derive 59 the functional clock 60 - description: 61 For newer hardware (rk3399) this is the bus clock 62 63 clock-names: 64 minItems: 1 65 items: 66 - const: i2c 67 - const: pclk 68 69 rockchip,grf: 70 $ref: /schemas/types.yaml#/definitions/phandle 71 description: 72 Required on RK3066, RK3188 the phandle of the syscon node for 73 the general register file (GRF) 74 On those SoCs an alias with the correct I2C bus ID 75 (bit offset in the GRF) is also required. 76 77 clock-frequency: 78 default: 100000 79 description: 80 SCL frequency to use (in Hz). If omitted, 100kHz is used. 81 82 i2c-scl-rising-time-ns: 83 default: 1000 84 description: 85 Number of nanoseconds the SCL signal takes to rise 86 (t(r) in I2C specification). If not specified this is assumed to be 87 the maximum the specification allows(1000 ns for Standard-mode, 88 300 ns for Fast-mode) which might cause slightly slower communication. 89 90 i2c-scl-falling-time-ns: 91 default: 300 92 description: 93 Number of nanoseconds the SCL signal takes to fall 94 (t(f) in the I2C specification). If not specified this is assumed to 95 be the maximum the specification allows (300 ns) which might cause 96 slightly slower communication. 97 98 i2c-sda-falling-time-ns: 99 default: 300 100 description: 101 Number of nanoseconds the SDA signal takes to fall 102 (t(f) in the I2C specification). If not specified we will use the SCL 103 value since they are the same in nearly all cases. 104 105required: 106 - compatible 107 - reg 108 - interrupts 109 - clocks 110 - clock-names 111 112if: 113 properties: 114 compatible: 115 contains: 116 enum: 117 - rockchip,rk3066-i2c 118 - rockchip,rk3188-i2c 119 120then: 121 required: 122 - rockchip,grf 123 124unevaluatedProperties: false 125 126examples: 127 - | 128 #include <dt-bindings/clock/rk3188-cru-common.h> 129 #include <dt-bindings/interrupt-controller/arm-gic.h> 130 #include <dt-bindings/interrupt-controller/irq.h> 131 i2c0: i2c@2002d000 { 132 compatible = "rockchip,rk3188-i2c"; 133 reg = <0x2002d000 0x1000>; 134 interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>; 135 clocks = <&cru PCLK_I2C0>; 136 clock-names = "i2c"; 137 rockchip,grf = <&grf>; 138 i2c-scl-falling-time-ns = <100>; 139 i2c-scl-rising-time-ns = <800>; 140 #address-cells = <1>; 141 #size-cells = <0>; 142 }; 143