snps,designware-i2c.yaml

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    1 # SPDX-License-Identifier: GPL-2.0-only
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/i2c/snps,designware-i2c.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Synopsys DesignWare APB I2C Controller
    8 
    9 maintainers:
   10   - Jarkko Nikula <jarkko.nikula@linux.intel.com>
   11 
   12 allOf:
   13   - $ref: /schemas/i2c/i2c-controller.yaml#
   14   - if:
   15       properties:
   16         compatible:
   17           not:
   18             contains:
   19               const: mscc,ocelot-i2c
   20     then:
   21       properties:
   22         reg:
   23           maxItems: 1
   24 
   25 properties:
   26   compatible:
   27     oneOf:
   28       - description: Generic Synopsys DesignWare I2C controller
   29         const: snps,designware-i2c
   30       - description: Microsemi Ocelot SoCs I2C controller
   31         items:
   32           - const: mscc,ocelot-i2c
   33           - const: snps,designware-i2c
   34       - description: Baikal-T1 SoC System I2C controller
   35         const: baikal,bt1-sys-i2c
   36 
   37   reg:
   38     minItems: 1
   39     items:
   40       - description: DW APB I2C controller memory mapped registers
   41       - description: |
   42           ICPU_CFG:TWI_DELAY registers to setup the SDA hold time.
   43           This registers are specific to the Ocelot I2C-controller.
   44 
   45   interrupts:
   46     maxItems: 1
   47 
   48   clocks:
   49     minItems: 1
   50     items:
   51       - description: I2C controller reference clock source
   52       - description: APB interface clock source
   53 
   54   clock-names:
   55     minItems: 1
   56     items:
   57       - const: ref
   58       - const: pclk
   59 
   60   resets:
   61     maxItems: 1
   62 
   63   clock-frequency:
   64     description: Desired I2C bus clock frequency in Hz
   65     enum: [100000, 400000, 1000000, 3400000]
   66     default: 400000
   67 
   68   i2c-sda-hold-time-ns:
   69     description: |
   70       The property should contain the SDA hold time in nanoseconds. This option
   71       is only supported in hardware blocks version 1.11a or newer or on
   72       Microsemi SoCs.
   73 
   74   i2c-scl-falling-time-ns:
   75     description: |
   76       The property should contain the SCL falling time in nanoseconds.
   77       This value is used to compute the tLOW period.
   78     default: 300
   79 
   80   i2c-sda-falling-time-ns:
   81     description: |
   82       The property should contain the SDA falling time in nanoseconds.
   83       This value is used to compute the tHIGH period.
   84     default: 300
   85 
   86   dmas:
   87     items:
   88       - description: TX DMA Channel
   89       - description: RX DMA Channel
   90 
   91   dma-names:
   92     items:
   93       - const: tx
   94       - const: rx
   95 
   96 unevaluatedProperties: false
   97 
   98 required:
   99   - compatible
  100   - reg
  101   - interrupts
  102 
  103 examples:
  104   - |
  105     i2c@f0000 {
  106       compatible = "snps,designware-i2c";
  107       reg = <0xf0000 0x1000>;
  108       interrupts = <11>;
  109       clock-frequency = <400000>;
  110     };
  111   - |
  112     i2c@1120000 {
  113       compatible = "snps,designware-i2c";
  114       reg = <0x1120000 0x1000>;
  115       interrupts = <12 1>;
  116       clock-frequency = <400000>;
  117       i2c-sda-hold-time-ns = <300>;
  118       i2c-sda-falling-time-ns = <300>;
  119       i2c-scl-falling-time-ns = <300>;
  120     };
  121   - |
  122     i2c@2000 {
  123       compatible = "snps,designware-i2c";
  124       reg = <0x2000 0x100>;
  125       #address-cells = <1>;
  126       #size-cells = <0>;
  127       clock-frequency = <400000>;
  128       clocks = <&i2cclk>;
  129       interrupts = <0>;
  130 
  131       eeprom@64 {
  132         compatible = "atmel,24c02";
  133         reg = <0x64>;
  134       };
  135     };
  136   - |
  137     i2c@100400 {
  138       compatible = "mscc,ocelot-i2c", "snps,designware-i2c";
  139       reg = <0x100400 0x100>, <0x198 0x8>;
  140       pinctrl-0 = <&i2c_pins>;
  141       pinctrl-names = "default";
  142       interrupts = <8>;
  143       clocks = <&ahb_clk>;
  144     };
  145 ...

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