1 # SPDX-License-Identifier: GPL-2.0
4 $id: http://devicetree.org/schemas/i2c/i2c-rk3x.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Rockchip RK3xxx I2C controller
10 This driver interfaces with the native I2C controller present in Rockchip
14 - $ref: /schemas/i2c/i2c-controller.yaml#
17 - Heiko Stuebner <heiko@sntech.de>
19 # Everything else is described in the common file
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
33 - const: rockchip,rk3288-i2c
40 - const: rockchip,rk3399-i2c
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
58 For newer hardware (rk3399) this is the bus clock
67 $ref: /schemas/types.yaml#/definitions/phandle
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.
77 SCL frequency to use (in Hz). If omitted, 100kHz is used.
79 i2c-scl-rising-time-ns:
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.
87 i2c-scl-falling-time-ns:
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.
95 i2c-sda-falling-time-ns:
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.
114 - rockchip,rk3066-i2c
115 - rockchip,rk3188-i2c
121 unevaluatedProperties: false
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>
129 compatible = "rockchip,rk3188-i2c";
130 reg = <0x2002d000 0x1000>;
131 interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
132 clocks = <&cru PCLK_I2C0>;
134 rockchip,grf = <&grf>;
135 i2c-scl-falling-time-ns = <100>;
136 i2c-scl-rising-time-ns = <800>;
137 #address-cells = <1>;