# 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 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: maxItems: 1 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: maxItems: 1 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: maxItems: 1 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>; }; ...