“I2C device tree configuration”的版本间的差异

2020年11月8日 (日) 14:39的最新版本

Article purpose

本文介绍了如何配置“ I2C内部外围设备”^[1] when the peripheral is assigned to Linux^® OS，尤其是：

如何配置STM32 I2C外设
如何配置板上或硬件扩展上存在的STM32外部I2C器件。

使用设备树机制执行配置^[2].

它由“STM32 I2C Linux^®驱动程序”使用，该驱动程序在 I2C框架中注册相关信息。

如果将外围设备分配给另一个执行上下文，请参阅 How to assign an internal peripheral to a runtime context 文章，以获取有关外围设备分配和配置的准则。

DT bindings documentation

I2C表示为：

“I2C总线的通用设备树绑定”^[3]
“STM32 I2C控制器设备树绑定”^[4]

DT configuration

该硬件描述是STM32微处理器设备树文件（扩展名为.dtsi）和板子设备树文件（扩展名为.dts）的组合。有关设备树文件分割的说明，请参见Device tree。

STM32CubeMX可用于生成板卡设备树。有关更多详细信息，请参考How to configure the DT using STM32CubeMX。

DT configuration (STM32 level)

在设备级，I2C控制器声明如下：

i2c2: i2c@40013000 {
	compatible = "st,stm32f7-i2c";
	reg = <0x5c002000 0x400>;
	interrupt-names = "event", "error", "wakeup";
	interrupts-extended = <&intc GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>,
			      <&intc GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>,
			      <&exti 22 1>;
	clocks = <&rcc I2C2_K>;
	resets = <&rcc I2C2_R>;
	#address-cells = <1>;
	#size-cells = <0>;
	dmas = <&dmamux1 35 0x400 0x05>,
	       <&dmamux1 36 0x400 0x05>;
	power-domains = <&pd_core>;
	st,syscfg-fmp = <&syscfg 0x4 0x2>;
	st,syscfg-fmp-clr = <&syscfg 0x44 0x2>;
	status = "disabled";
};

该设备树部分与STM32微处理器有关。它必须保持原样，而不能由最终用户修改。

请参考DTS文件: stm32mp157c.dtsi^[5]

DT configuration (board level)

&i2c3 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&i2c2_pins_a>;
	pinctrl-1 = <&i2c2_pins_sleep_a>;
	i2c-scl-rising-time-ns = <185>;
	i2c-scl-falling-time-ns = <20>;
        st,smbus-alert;
        st,smbus-host-notify;
	status = "okay";
	/delete-property/dmas;
	/delete-property/dma-names;

	ov5640: camera@3c {
         [...]
	};
};

设备树配置分为两个级别：

I²C internal peripheral related properties

与I2C内部外围设备和I2C节点所属的I²C总线相关的设备树属性

pinctrl-0&1 配置取决于硬件板配置以及I2C设备如何连接到SCL，SDA（如果设备符合SMBus标准，则连接到SMBA）引脚。
有关引脚配置的更多详细信息，请参见： Pinctrl device tree configuration
clock-frequency代表I2C总线速度：正常（100KHz），快速（400KHz）和快速+（最高 1MHz）。该值以Hz为单位。
dmas 默认情况下，所有I2C实例均启用DMA。如果不需要，则由用户决定是否“删除”。

/delete-property/ 用于删除I2C的DMA使用情况。要删除DMA，必须同时插入/delete-property/dma-names 和 /delete-property/dmas。

i2c-scl-rising/falling-time-ns是可选值，具体取决于板的硬件特性：导线长度，电阻和电容的硬件设计。
这些值必须以纳秒为单位提供，并且可以通过观察示波器上的SCL上升和下降斜率来测量。请参见 how to measure I2C timings.
I2C驱动程序使用此信息根据请求的 clock-frequency来计算准确的I2C时序。
STM32CubeMX实现了遵循I2C标准并考虑用户输入的算法。
如果未提供这些值，则驱动程序将使用其默认值。
提供错误的参数将产生不正确的 clock-frequency. 如果驱动程序未能根据用户输入计算时序参数（SCL上升/下降和时钟频率），则时钟频率将降级为较低的频率。示例:如果用户将400 kHz指定为时钟频率，但是算法无法为指定的SCL上升和下降时间生成时序，则时钟频率将降至100 kHz。

对于高于100KHz的I2C总线频率，强烈建议使用I2C时序。

st,smbus-alert 可选属性允许启用驱动程序对SMBus Alert机制的处理。启用后，只要从设备生成SMBus警报消息，就会调用从驱动程序的警报功能。
st,smbus-host-notify 可选属性允许启用驱动程序对SMBus Host Notify机制的处理。启用后，每当从设备发送主机通知消息时，就会调用IRQ处理程序。

请参阅Linux smbus-protocol文档 ^[6]了解有关SMBus警报和主机通知处理的更多详细信息。

I²C devices related properties

与连接到指定I²C总线的I²C设备有关的设备树属性。每个I²C设备均由一个子节点表示。

reg 代表总线上的I2C外设从机地址。
请注意，某些从地址位对于框架可能具有特殊含义。例如，31^st 位表示10位设备功能。
有关更多详细信息，请参考i2c.txt ^[3]。

How to measure I2C timings

i2c-scl-rising-time-ns is measured on the SCL rising edge and i2c-scl-falling-time-ns on the SCL falling edge. On the oscilloscope, measure the time between the 20% to 80% range of amplitude for rising time and falling time in nanoseconds.

I2C timings

DT configuration examples

Example of an external EEPROM slave device

i2c4: {
    status = "okay";
    i2c-scl-rising-time-ns = <185>;
    i2c-scl-falling-time-ns = <20>;
   
    eeprom@50 {
        compatible = "at,24c256";
        pagesize = <64>;
        reg = <0x50>;
    };
};

上面的示例在地址0x50的i2c-X总线(X取决于运行时探测的适配器数量)上注册一个EEPROM设备，并且该实例与使用相同Compatible属性注册的驱动程序兼容。
请注意，驱动程序将使用MDMA进行数据传输，SCL上升/下降时间已作为输入提供。

Example of an EEPROM slave device emulator registering on STM32 side

i2c4: {
    eeprom@64 {
        status = "okay";
        compatible = "linux,slave-24c02";
        reg = <0x40000064>;
    };
};

上例在STM32侧的从机地址0x64处注册了一个EEPROM仿真器。
STM32充当I2C EEPROM，可通过连接在I2C总线上的外部主设备进行访问。

Example of a stts751 thermal sensor with SMBus Alert feature enabled

当达到配置阈值时，stts751热传感器 ^[7] 能够发送SMBus警报。
可以在内核中启用设备驱动程序：

[x] Device Drivers
    [x] Hardware Monitoring support
        [x] ST Microelectronics STTS751

这可以在您的内核中手动完成：

CONFIG_SENSORS_STTS751=y

由于SMBus警报依靠专用引脚来工作，因此必须更新I2C控制器（此处为i2c2）的pinctrl以添加相应的SMBA引脚。

对于i2c2控制器：

i2c2_pins_a: i2c2-0 {
    pins {
        pinmux = <STM32_PINMUX('H', 4, AF4)>, /* I2C2_SCL */
                        <STM32_PINMUX('H', 5, AF4)>, /* I2C2_SDA */
                        <STM32_PINMUX('H', 6, AF4)>; /* I2C2_SMBA */
        bias-disable;
        drive-open-drain;
        slew-rate = <0>;
    };
};

i2c2_pins_sleep_a: i2c2-1 {
    pins {
        pinmux = <STM32_PINMUX('H', 4, ANALOG)>, /* I2C2_SCL */
                        <STM32_PINMUX('H', 5, ANALOG)>, /* I2C2_SDA */
                        <STM32_PINMUX('H', 6, ANALOG)>; /* I2C2_SMBA */
    };
};

在设备树中，必须添加st，smbus-alert属性以及启用stts751的节点。

i2c2: {
    st,smbus-alert;
    stts751@3b {
        status = "okay";
        compatible = "stts751";
        reg = <0x3b>;
    };
};

How to configure the DT using STM32CubeMX

The STM32CubeMX工具可用于配置STM32MPU设备并获取相应的 platform configuration device tree 文件。
STM32CubeMX可能不支持以上DT bindings documentation段中描述的所有属性。如果是这样，该工具会在生成的设备树中插入用户部分 。然后可以编辑这些部分以添加一些属性，并将它们一代一代地保留下来。有关更多信息，请参见STM32CubeMX 用户手册。

References

请参考以下链接以获取更多信息：

[I2C_internal_peripheral-1] I2C internal peripheral

[2] Device tree

[i2c.txt-3] 3.0^3.1 Documentation/devicetree/bindings/i2c/i2c.txt| |}} Documentation/devicetree/bindings/i2c/i2c.txt , Generic device tree bindings for I2C busses

[i2c-stm32.txt-4] Documentation/devicetree/bindings/i2c/i2c-stm32.txt| |}} Documentation/devicetree/bindings/i2c/i2c-stm32.txt

[DTS-5] rch/arm/boot/dts/stm32mp157c.dtsi| |}} arch/arm/boot/dts/stm32mp157c.dtsi

[smbus-protocol-6] Documentation/i2c/smbus-protocol| |}} Documentation/i2c/smbus-protocol

[7] ttps://www.st.com/en/mems-and-sensors/stts751.html

[1]

[2]

[3]

[4]

[5]

[6]

[7]

@@ 第1行： / 第1行： @@
 == Article purpose ==
-This article explains how to configure the ''I2C internal peripheral''<ref name="I2C internal peripheral"> [[I2C internal peripheral]] </ref> ''' when the peripheral is assigned to Linux<sup>&reg;</sup> OS''', and in particular:
+本文介绍了如何配置“ I2C内部外围设备”<ref name="I2C internal peripheral"> [[I2C internal peripheral]] </ref> ''' when the peripheral is assigned to Linux<sup>&reg;</sup> OS'''，尤其是：
-* how to configure the STM32 I2C peripheral
+* 如何配置STM32 I2C外设
-* how to configure the STM32 external I2C devices present either on the board or on a hardware extension.
+* 如何配置板上或硬件扩展上存在的STM32外部I2C器件。
-The configuration is performed using the '''device tree mechanism'''<ref> [[Device tree]]</ref>.
+使用'''设备树机制'''执行配置<ref> [[Device tree]]</ref>.
-It is used by the ''STM32 I2C Linux<sup>&reg;</sup> driver'' that registers relevant information in the [[I2C overview|I2C]] framework.
+它由“STM32 I2C Linux<sup>&reg;</sup>驱动程序”使用，该驱动程序在 [[I2C overview|I2C]]框架中注册相关信息。
-If the peripheral is assigned to another execution context, refer to [[How to assign an internal peripheral to a runtime context]] article for guidelines on peripheral assignment and configuration.
+如果将外围设备分配给另一个执行上下文，请参阅 [[How to assign an internal peripheral to a runtime context]] 文章，以获取有关外围设备分配和配置的准则。
 == DT bindings documentation ==
-The I2C is represented by:
+I2C表示为：
-* The ''Generic device tree bindings for I2C busses''<ref name="i2c.txt">{{CodeSource | Linux kernel | Documentation/devicetree/bindings/i2c/i2c.txt}}, Generic device tree bindings for I2C busses</ref>
+* “I2C总线的通用设备树绑定”<ref name="i2c.txt">{{CodeSource | Linux kernel | Documentation/devicetree/bindings/i2c/i2c.txt}}, Generic device tree bindings for I2C busses</ref>
-* The ''STM32 I2C controller device tree bindings''<ref name="i2c-stm32.txt ">{{CodeSource |Linux kernel | Documentation/devicetree/bindings/i2c/i2c-stm32.txt}}</ref>
+*“STM32 I2C控制器设备树绑定”<ref name="i2c-stm32.txt ">{{CodeSource |Linux kernel | Documentation/devicetree/bindings/i2c/i2c-stm32.txt}}</ref>
 == DT configuration ==
-This hardware description is a combination of the '''STM32 microprocessor''' device tree files (''.dtsi'' extension) and '''board''' device tree files (''.dts'' extension). See the [[Device tree]] for an explanation of the device tree file split.
+该硬件描述是'''STM32微处理器'''设备树文件（扩展名为.dtsi）和'''板子'''设备树文件（扩展名为.dts）的组合。 有关设备树文件分割的说明，请参见[[Device tree]]。
-'''STM32CubeMX''' can be used to generate the board device tree. Refer to [[#How_to_configure_the_DT_using_STM32CubeMX|How to configure the DT using STM32CubeMX]] for more details.
+'''STM32CubeMX'''可用于生成板卡设备树。有关更多详细信息，请参考[[#How_to_configure_the_DT_using_STM32CubeMX|How to configure the DT using STM32CubeMX]]。
 ===DT configuration (STM32 level) ===
-At device level, the I2C controller is declared as follows:
+在设备级，I2C控制器声明如下：
 <pre>
 i2c2: i2c@40013000 {
@@ 第43行： / 第43行： @@
 };
 </pre>
-{{Warning|This device tree part is related to STM32 microprocessors. It must be kept as is, without being modified by the end-user.}}
+{{Warning|该设备树部分与STM32微处理器有关。 它必须保持原样，而不能由最终用户修改。}}
-Refer to the DTS file: stm32mp157c.dtsi<ref name=DTS>{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp157c.dtsi}}</ref>
+请参考DTS文件: stm32mp157c.dtsi<ref name=DTS>{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp157c.dtsi}}</ref>
 === DT configuration (board level) ===
@@ 第67行： / 第67行： @@
 </pre>
-There are two levels of device tree configuration:
+设备树配置分为两个级别：
 ==== I²C internal peripheral related properties ====
-The device tree properties related to the I²C internal peripheral and to the I²C bus which belong to i2cx node
+与I2C内部外围设备和I2C节点所属的I²C总线相关的设备树属性
-* '''{{highlight|pinctrl-0&1}}''' configuration depends on hardware board configuration and how the I2C devices are connected to SCL, SDA (and SMBA if device is SMBus Compliant) pins.<br/> More details about pin configuration are available here: [[Pinctrl device tree configuration]]
+* '''{{highlight|pinctrl-0&1}}''' 配置取决于硬件板配置以及I2C设备如何连接到SCL，SDA（如果设备符合SMBus标准，则连接到SMBA）引脚。<br/> 有关引脚配置的更多详细信息，请参见： [[Pinctrl device tree configuration]]
-* '''{{highlight|clock-frequency}}''' represents the I2C bus speed : '''normal (100KHz)''', '''Fast (400KHz)''' and '''Fast+(up to 1MHz)'''. This value is given in Hz.
+* '''{{highlight|clock-frequency}}'''代表I2C总线速度：'''正常（100KHz）'''，'''快速（400KHz）'''和'''快速+（最高 1MHz）'''。该值以Hz为单位。
-* '''{{highlight|dmas}}''' By default, DMAs are enabled for all I2C instances. This is up to the user to '''remove''' them if not needed. ''{{highlight|/delete-property/}}'' is used to remove DMA usage for I2C. Both '''{{highlight|/delete-property/dma-names}}''' and '''{{highlight|/delete-property/dmas}}''' have to be inserted to get rid of DMAs.
+* '''{{highlight|dmas}}''' 默认情况下，所有I2C实例均启用DMA。如果不需要，则由用户决定是否“删除”。
-* '''{{highlight|i2c-scl-rising/falling-time-ns}}''' are optional values depending on the board hardware characteristics: wires length, resistor and capacitor of the hardware design.<br/> These values must be provided in nanoseconds and can be measured by observing the SCL rising and falling slope on an oscilloscope. See [[I2C device tree configuration#How to measure I2C timings | how to measure I2C timings]].<br/>The I2C driver uses this information to compute accurate I2C timings according to the requested ''{{highlight|clock-frequency}}''. <br/>The STM32CubeMX implements an algorithm that follows the I2C standard and takes into account the user inputs. <br/>When those values are not provided, the driver uses its default values. <br/>Providing wrong parameters will produce inaccurate ''{{highlight|clock-frequency}}''. In case the driver fails to compute timing parameters in line with the user input (SCL raising/falling and clock frequency), the clock frequency will be downgraded to a lower frequency. '''Example''': if user specifies 400 kHz as clock frequency but the algorithm fails to generate timings for the specified SCL rising and falling time, the clock frequency will be dropped to 100 kHz.
+''{{highlight|/delete-property/}}'' 用于删除I2C的DMA使用情况。要删除DMA，必须同时插入'''{{highlight|/delete-property/dma-names}}''' 和 '''{{highlight|/delete-property/dmas}}'''。
-{{Info| I2C timings are highly recommended for I2C bus frequency higher than 100KHz.}}
+* '''{{highlight|i2c-scl-rising/falling-time-ns}}'''是可选值，具体取决于板的硬件特性： 导线长度，电阻和电容的硬件设计。<br/> 这些值必须以纳秒为单位提供，并且可以通过观察示波器上的SCL上升和下降斜率来测量。请参见[[I2C device tree configuration#How to measure I2C timings | how to measure I2C timings]].<br/>I2C驱动程序使用此信息根据请求的 ''{{highlight|clock-frequency}}''来计算准确的I2C时序。 <br/>STM32CubeMX实现了遵循I2C标准并考虑用户输入的算法。 <br/>如果未提供这些值，则驱动程序将使用其默认值。 <br/>提供错误的参数将产生不正确的 ''{{highlight|clock-frequency}}''. 如果驱动程序未能根据用户输入计算时序参数（SCL上升/下降和时钟频率），则时钟频率将降级为较低的频率。'''示例''':如果用户将400 kHz指定为时钟频率，但是算法无法为指定的SCL上升和下降时间生成时序，则时钟频率将降至100 kHz。
+{{Info| 对于高于100KHz的I2C总线频率，强烈建议使用I2C时序。}}
-'''For {{EcosystemRelease | revision=1.2.0 | range=and after}}'''
-* '''{{highlight|st,smbus-alert}}''' optional property allow to enable the driver handling of the SMBus Alert mechanism. When enabled, the slave driver's alert function will be called whenever the slave device generates an SMBus Alert message.
+* '''{{highlight|st,smbus-alert}}''' 可选属性允许启用驱动程序对SMBus Alert机制的处理。 启用后，只要从设备生成SMBus警报消息，就会调用从驱动程序的警报功能。
-* '''{{highlight|st,smbus-host-notify}}''' optional property allow to enable the driver handling of the SMBus Host Notify mechanism. When enabled, an IRQ handler will get called whenever a slave device sends a Host Notify message.
+* '''{{highlight|st,smbus-host-notify}}''' 可选属性允许启用驱动程序对SMBus Host Notify机制的处理。 启用后，每当从设备发送主机通知消息时，就会调用IRQ处理程序。
-{{Info| See Linux smbus-protocol documentation <ref name="smbus-protocol ">{{CodeSource |Linux kernel | Documentation/i2c/smbus-protocol}}</ref> for more details about SMBus Alert & Host Notify handling.}}
+{{Info| 请参阅Linux smbus-protocol文档 <ref name="smbus-protocol ">{{CodeSource |Linux kernel | Documentation/i2c/smbus-protocol}}</ref>了解有关SMBus警报和主机通知处理的更多详细信息。}}
 ==== I²C devices related properties ====
-The device tree properties related to I²C devices connected to the specified I²C bus. Each I²C device is represented by a sub-node.
+与连接到指定I²C总线的I²C设备有关的设备树属性。 每个I²C设备均由一个子节点表示。
-* '''{{highlight|reg}}''' represents the I2C peripheral slave address on the bus.<br/> Be aware that some slave address bits can have a special meaning for the framework. For instance, the 31<sup>st</sup> bit indicates 10-bit device capability.<br/> Refer to i2c.txt<ref name="i2c.txt"/> for further details
+* '''{{highlight|reg}}''' 代表总线上的I2C外设从机地址。<br/> 请注意，某些从地址位对于框架可能具有特殊含义。 例如，31<sup>st</sup> 位表示10位设备功能。<br/> 有关更多详细信息，请参考i2c.txt <ref name="i2c.txt"/>。
 ====How to measure I2C timings====
@@ 第107行： / 第109行： @@
 };
 </pre>
-The above example registers an EEPROM device on i2c-X bus (X depends on how many adapters are probed at runtime) at address 0x50 and this instance is compatible with the driver registered with the same compatible property.<br/>
+上面的示例在地址0x50的i2c-X总线(X取决于运行时探测的适配器数量)上注册一个EEPROM设备，并且该实例与使用相同Compatible属性注册的驱动程序兼容。<br/>
-Please note that the driver is going to use MDMA for data transfer and that SCL rising/falling times have been provided as inputs.<br/>
+请注意，驱动程序将使用MDMA进行数据传输，SCL上升/下降时间已作为输入提供。<br/>
 ====Example of an EEPROM slave device emulator registering on STM32 side====
@@ 第120行： / 第122行： @@
 };
 </pre>
-The above example registers an EEPROM emulator on STM32 side at slave address 0x64. <br/>
+上例在STM32侧的从机地址0x64处注册了一个EEPROM仿真器。 <br/>
-STM32 acts as an I2C EEPROM that can be accessed from an external master device connected on I2C bus.
+STM32充当I2C EEPROM，可通过连接在I2C总线上的外部主设备进行访问。
 ====Example of a stts751 thermal sensor with SMBus Alert feature enabled====
-'''For {{EcosystemRelease | revision=1.2.0 | range=and after}}'''<br/>
-The stts751 thermal sensor <ref>https://www.st.com/en/mems-and-sensors/stts751.html</ref> is able to send an SMBus Alert when configured threshold are reached.</br>
+当达到配置阈值时，stts751热传感器 <ref>https://www.st.com/en/mems-and-sensors/stts751.html</ref> 能够发送SMBus警报。</br>
-The device driver can be enabled in the kernel:</br>
+可以在内核中启用设备驱动程序：</br>
   [x] Device Drivers
       [x] Hardware Monitoring support
           [x] ST Microelectronics STTS751
-This can be done manually in your kernel:
+这可以在您的内核中手动完成：
 CONFIG_SENSORS_STTS751=y
-Since the SMBus Alert is relying on a dedicated pin to work, the pinctrl of the I2C controller (here i2c2) must be updated to add the corresponding SMBA pin.</br>
+由于SMBus警报依靠专用引脚来工作，因此必须更新I2C控制器（此处为i2c2）的pinctrl以添加相应的SMBA引脚。</br>
-For the i2c2 controller:
+对于i2c2控制器：
 <pre>
 i2c2_pins_a: i2c2-0 {
@@ 第159行： / 第161行： @@
 </pre>
-Within the device-tree, the st,smbus-alert property must be added, as well as the node to enable the stts751.</br>
+在设备树中，必须添加st，smbus-alert属性以及启用stts751的节点。</br>
 <pre>
@@ 第173行： / 第175行： @@
 ==How to configure the DT using STM32CubeMX==
-The [[STM32CubeMX]] tool can be used to configure the STM32MPU device and get the corresponding [[Device_tree#STM32|platform configuration device tree]] files.<br />
+The [[STM32CubeMX]]工具可用于配置STM32MPU设备并获取相应的 [[Device_tree#STM32|platform configuration device tree]] 文件。<br />
-The STM32CubeMX may not support all the properties described in the above [[#DT bindings documentation|DT bindings documentation]] paragraph. If so, the tool inserts '''user sections''' in the generated device tree. These sections can then be edited to add some properties and they are preserved from one generation to another. Refer to [[STM32CubeMX]] user manual for further information.
+STM32CubeMX可能不支持以上[[#DT bindings documentation|DT bindings documentation]]段中描述的所有属性。 如果是这样，该工具会在生成的设备树中插入'''用户部分''' 。 然后可以编辑这些部分以添加一些属性，并将它们一代一代地保留下来。 有关更多信息，请参见[[STM32CubeMX]] 用户手册。
 ==References==
-Please refer to the following links for additional information:
+请参考以下链接以获取更多信息：
 <references />
-<noinclude>
-[[Category:Device tree configuration]]
-[[Category:I2C]]
-{{ArticleBasedOnModel | Peripheral or framework device tree configuration model}}
-{{PublicationRequestId | 9163 | 2018-10-11 | AlainF}}
-</noinclude>

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2020年11月8日 (日) 14:39的最新版本

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Article purpose

DT bindings documentation

DT configuration

DT configuration (STM32 level)

DT configuration (board level)

I²C internal peripheral related properties

I²C devices related properties

How to measure I2C timings

DT configuration examples

Example of an external EEPROM slave device

Example of an EEPROM slave device emulator registering on STM32 side

Example of a stts751 thermal sensor with SMBus Alert feature enabled

How to configure the DT using STM32CubeMX

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“I2C device tree configuration”的版本间的差异

2020年11月8日 (日) 14:39的最新版本

目录

Article purpose

DT bindings documentation

DT configuration

DT configuration (STM32 level)

DT configuration (board level)

I²C internal peripheral related properties

I²C devices related properties

How to measure I2C timings

DT configuration examples

Example of an external EEPROM slave device

Example of an EEPROM slave device emulator registering on STM32 side

Example of a stts751 thermal sensor with SMBus Alert feature enabled

How to configure the DT using STM32CubeMX

References

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