i2c-rk3x.yaml

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    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 
    7 title: Rockchip RK3xxx I2C controller
    8 
    9 description:
   10   This driver interfaces with the native I2C controller present in Rockchip
   11   RK3xxx SoCs.
   12 
   13 allOf:
   14   - $ref: /schemas/i2c/i2c-controller.yaml#
   15 
   16 maintainers:
   17   - Heiko Stuebner <heiko@sntech.de>
   18 
   19 # Everything else is described in the common file
   20 properties:
   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               - rockchip,rv1126-i2c
   42           - const: rockchip,rk3399-i2c
   43 
   44   reg:
   45     maxItems: 1
   46 
   47   interrupts:
   48     maxItems: 1
   49 
   50   clocks:
   51     minItems: 1
   52     items:
   53       - description:
   54           For older hardware (rk3066, rk3188, rk3228, rk3288)
   55           there is one clock that is used both to derive the functional clock
   56           for the device and as the bus clock.
   57           For newer hardware (rk3399) this clock is used to derive
   58           the functional clock
   59       - description:
   60           For newer hardware (rk3399) this is the bus clock
   61 
   62   clock-names:
   63     minItems: 1
   64     items:
   65       - const: i2c
   66       - const: pclk
   67 
   68   rockchip,grf:
   69     $ref: /schemas/types.yaml#/definitions/phandle
   70     description:
   71       Required on RK3066, RK3188 the phandle of the syscon node for
   72       the general register file (GRF)
   73       On those SoCs an alias with the correct I2C bus ID
   74       (bit offset in the GRF) is also required.
   75 
   76   clock-frequency:
   77     default: 100000
   78     description:
   79       SCL frequency to use (in Hz). If omitted, 100kHz is used.
   80 
   81   i2c-scl-rising-time-ns:
   82     default: 1000
   83     description:
   84       Number of nanoseconds the SCL signal takes to rise
   85       (t(r) in I2C specification). If not specified this is assumed to be
   86       the maximum the specification allows(1000 ns for Standard-mode,
   87       300 ns for Fast-mode) which might cause slightly slower communication.
   88 
   89   i2c-scl-falling-time-ns:
   90     default: 300
   91     description:
   92       Number of nanoseconds the SCL signal takes to fall
   93       (t(f) in the I2C specification). If not specified this is assumed to
   94       be the maximum the specification allows (300 ns) which might cause
   95       slightly slower communication.
   96 
   97   i2c-sda-falling-time-ns:
   98     default: 300
   99     description:
  100       Number of nanoseconds the SDA signal takes to fall
  101       (t(f) in the I2C specification). If not specified we will use the SCL
  102       value since they are the same in nearly all cases.
  103 
  104 required:
  105   - compatible
  106   - reg
  107   - interrupts
  108   - clocks
  109   - clock-names
  110 
  111 if:
  112   properties:
  113     compatible:
  114       contains:
  115         enum:
  116           - rockchip,rk3066-i2c
  117           - rockchip,rk3188-i2c
  118 
  119 then:
  120   required:
  121     - rockchip,grf
  122 
  123 unevaluatedProperties: false
  124 
  125 examples:
  126   - |
  127     #include <dt-bindings/clock/rk3188-cru-common.h>
  128     #include <dt-bindings/interrupt-controller/arm-gic.h>
  129     #include <dt-bindings/interrupt-controller/irq.h>
  130     i2c0: i2c@2002d000 {
  131       compatible = "rockchip,rk3188-i2c";
  132       reg = <0x2002d000 0x1000>;
  133       interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
  134       clocks = <&cru PCLK_I2C0>;
  135       clock-names = "i2c";
  136       rockchip,grf = <&grf>;
  137       i2c-scl-falling-time-ns = <100>;
  138       i2c-scl-rising-time-ns = <800>;
  139       #address-cells = <1>;
  140       #size-cells = <0>;
  141     };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/i2c/i2c-rk3x.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/i2c/i2c-rk3x.yaml