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