| # SPDX-License-Identifier: GPL-2.0-only |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/i2c/snps,designware-i2c.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Synopsys DesignWare APB I2C Controller |
| |
| maintainers: |
| - Jarkko Nikula <jarkko.nikula@linux.intel.com> |
| |
| allOf: |
| - $ref: /schemas/i2c/i2c-controller.yaml# |
| - if: |
| properties: |
| compatible: |
| not: |
| contains: |
| const: mscc,ocelot-i2c |
| then: |
| properties: |
| reg: |
| maxItems: 1 |
| |
| properties: |
| compatible: |
| oneOf: |
| - description: Generic Synopsys DesignWare I2C controller |
| const: snps,designware-i2c |
| - description: Microsemi Ocelot SoCs I2C controller |
| items: |
| - const: mscc,ocelot-i2c |
| - const: snps,designware-i2c |
| - description: Baikal-T1 SoC System I2C controller |
| const: baikal,bt1-sys-i2c |
| |
| reg: |
| minItems: 1 |
| items: |
| - description: DW APB I2C controller memory mapped registers |
| - description: | |
| ICPU_CFG:TWI_DELAY registers to setup the SDA hold time. |
| This registers are specific to the Ocelot I2C-controller. |
| |
| interrupts: |
| maxItems: 1 |
| |
| clocks: |
| minItems: 1 |
| items: |
| - description: I2C controller reference clock source |
| - description: APB interface clock source |
| |
| clock-names: |
| minItems: 1 |
| items: |
| - const: ref |
| - const: pclk |
| |
| resets: |
| maxItems: 1 |
| |
| clock-frequency: |
| description: Desired I2C bus clock frequency in Hz |
| enum: [100000, 400000, 1000000, 3400000] |
| default: 400000 |
| |
| i2c-sda-hold-time-ns: |
| description: | |
| The property should contain the SDA hold time in nanoseconds. This option |
| is only supported in hardware blocks version 1.11a or newer or on |
| Microsemi SoCs. |
| |
| i2c-scl-falling-time-ns: |
| description: | |
| The property should contain the SCL falling time in nanoseconds. |
| This value is used to compute the tLOW period. |
| default: 300 |
| |
| i2c-sda-falling-time-ns: |
| description: | |
| The property should contain the SDA falling time in nanoseconds. |
| This value is used to compute the tHIGH period. |
| default: 300 |
| |
| dmas: |
| items: |
| - description: TX DMA Channel |
| - description: RX DMA Channel |
| |
| dma-names: |
| items: |
| - const: tx |
| - const: rx |
| |
| unevaluatedProperties: false |
| |
| required: |
| - compatible |
| - reg |
| - interrupts |
| |
| examples: |
| - | |
| i2c@f0000 { |
| compatible = "snps,designware-i2c"; |
| reg = <0xf0000 0x1000>; |
| interrupts = <11>; |
| clock-frequency = <400000>; |
| }; |
| - | |
| i2c@1120000 { |
| compatible = "snps,designware-i2c"; |
| reg = <0x1120000 0x1000>; |
| interrupts = <12 1>; |
| clock-frequency = <400000>; |
| i2c-sda-hold-time-ns = <300>; |
| i2c-sda-falling-time-ns = <300>; |
| i2c-scl-falling-time-ns = <300>; |
| }; |
| - | |
| i2c@2000 { |
| compatible = "snps,designware-i2c"; |
| reg = <0x2000 0x100>; |
| #address-cells = <1>; |
| #size-cells = <0>; |
| clock-frequency = <400000>; |
| clocks = <&i2cclk>; |
| interrupts = <0>; |
| |
| eeprom@64 { |
| compatible = "atmel,24c02"; |
| reg = <0x64>; |
| }; |
| }; |
| - | |
| i2c@100400 { |
| compatible = "mscc,ocelot-i2c", "snps,designware-i2c"; |
| reg = <0x100400 0x100>, <0x198 0x8>; |
| pinctrl-0 = <&i2c_pins>; |
| pinctrl-names = "default"; |
| interrupts = <8>; |
| clocks = <&ahb_clk>; |
| }; |
| ... |
