| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | ... |