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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/i2c/st,stm32-i2c.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: I2C controller embedded in STMicroelectronics STM32 I2C platform
maintainers:
- Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
allOf:
- $ref: /schemas/i2c/i2c-controller.yaml#
- if:
properties:
compatible:
contains:
enum:
- st,stm32f7-i2c
then:
properties:
i2c-scl-rising-time-ns:
default: 25
i2c-scl-falling-time-ns:
default: 10
st,syscfg-fmp:
description: Use to set Fast Mode Plus bit within SYSCFG when
Fast Mode Plus speed is selected by slave.
Format is phandle to syscfg / register offset within
syscfg / register bitmask for FMP bit.
allOf:
- $ref: "/schemas/types.yaml#/definitions/phandle-array"
- items:
minItems: 3
maxItems: 3
- if:
properties:
compatible:
contains:
enum:
- st,stm32f4-i2c
then:
properties:
clock-frequency:
enum: [100000, 400000]
properties:
compatible:
enum:
- st,stm32f4-i2c
- st,stm32f7-i2c
reg:
maxItems: 1
interrupts:
items:
- description: interrupt ID for I2C event
- description: interrupt ID for I2C error
resets:
maxItems: 1
clocks:
maxItems: 1
dmas:
items:
- description: RX DMA Channel phandle
- description: TX DMA Channel phandle
dma-names:
items:
- const: rx
- const: tx
clock-frequency:
description: Desired I2C bus clock frequency in Hz. If not specified,
the default 100 kHz frequency will be used.
For STM32F7, STM32H7 and STM32MP1 SoCs, Standard-mode,
Fast-mode and Fast-mode Plus are supported, possible
values are 100000, 400000 and 1000000.
default: 100000
enum: [100000, 400000, 1000000]
required:
- compatible
- reg
- interrupts
- resets
- clocks
examples:
- |
#include <dt-bindings/mfd/stm32f7-rcc.h>
#include <dt-bindings/clock/stm32fx-clock.h>
//Example 1 (with st,stm32f4-i2c compatible)
i2c@40005400 {
compatible = "st,stm32f4-i2c";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x40005400 0x400>;
interrupts = <31>,
<32>;
resets = <&rcc 277>;
clocks = <&rcc 0 149>;
};
//Example 2 (with st,stm32f7-i2c compatible)
i2c@40005800 {
compatible = "st,stm32f7-i2c";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x40005800 0x400>;
interrupts = <31>,
<32>;
resets = <&rcc STM32F7_APB1_RESET(I2C1)>;
clocks = <&rcc 1 CLK_I2C1>;
};
//Example 3 (with st,stm32f7-i2c compatible on stm32mp)
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/clock/stm32mp1-clks.h>
#include <dt-bindings/reset/stm32mp1-resets.h>
i2c@40013000 {
compatible = "st,stm32f7-i2c";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x40013000 0x400>;
interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&rcc I2C2_K>;
resets = <&rcc I2C2_R>;
i2c-scl-rising-time-ns = <185>;
i2c-scl-falling-time-ns = <20>;
st,syscfg-fmp = <&syscfg 0x4 0x2>;
};
...
|
