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