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