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

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(未显示同一用户的3个中间版本)
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== DT bindings documentation ==
 
== DT bindings documentation ==
M_CAN device tree bindings<ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/net/can/m_can.txt | Documentation/devicetree/bindings/net/can/m_can.txt}} M_CAN device tree bindings</ref> describe all the required and optional properties.
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M_CAN设备树绑定<ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/net/can/m_can.txt | Documentation/devicetree/bindings/net/can/m_can.txt}} M_CAN device tree bindings</ref> 描述了所有必需和可选属性。
  
 
== DT configuration ==
 
== 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.
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该硬件描述是 '''STM32 microprocessor''' 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.
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'''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) ===
 
===DT configuration (STM32 level) ===
  
All M_CAN nodes are described in stm32mp157c.dtsi <ref>{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp157c.dtsi | arch/arm/boot/dts/stm32mp157c.dtsi}}, STM32MP157C device tree file</ref> file with disabled status and required properties such as:
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所有M_CAN节点均在stm32mp157c.dtsi中进行了描述 <ref>{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp157c.dtsi | arch/arm/boot/dts/stm32mp157c.dtsi}}, STM32MP157C device tree file</ref> 文件,该文件具有禁用状态和必需的属性,例如:
* Physical base address and size of the device register map
 
* Message RAM address and size (CAN SRAM)
 
* Host clock and CAN clock
 
* Message RAM configuration
 
  
This is a set of properties that may not vary for a given STM32 device.
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* 物理基址和设备寄存器映射的大小
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* 消息RAM地址和大小(CAN SRAM)
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* 主机时钟和CAN时钟
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* 消息RAM配置
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这是一组属性,对于给定的STM32器件可能不会改变。
 
   m_can1: can@4400e000 {
 
   m_can1: can@4400e000 {
 
   compatible = "bosch,m_can";                       
 
   compatible = "bosch,m_can";                       
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   status = "disabled";
 
   status = "disabled";
 
   };
 
   };
The required and optional properties are fully described in the [[FDCAN_device_tree_configuration#DT_bindings_documentation|bindings files]].
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[[FDCAN_device_tree_configuration#DT_bindings_documentation|bindings files]]中完整描述了必需和可选的属性。
  
{{Warning|This device tree part is related to STM32 microprocessors. It must be kept as is, without being modified by the end-user.}}
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{{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。}}
  
 
=== DT configuration (board level) ===
 
=== DT configuration (board level) ===
Part of the [[Device tree|device tree]] is used to describe the FDCAN hardware used on a given board. The DT node ('''"m_can"''') must be filled in:
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[[Device tree|device tree]] 的一部分用于描述在给定板上使用的FDCAN硬件。 DT节点 ('''"m_can"''') 必须填写:
* Enable the CAN block by setting '''status = "okay".'''
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* 通过设置 '''status = "okay".'''来启用CAN块。
* Configure the pins in use via [[Pinctrl overview|pinctrl]], through '''pinctrl-0''' (default pins), '''pinctrl-1''' (sleep pins) and '''pinctrl-names'''.
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* 通过 [[Pinctrl overview|pinctrl]], through '''pinctrl-0''' (default pins), '''pinctrl-1''' (sleep pins) and '''pinctrl-names'''来配置正在使用的管脚。
  
 
=== DT configuration examples ===
 
=== DT configuration examples ===
The example below shows how to configure and enable FDCAN1 instance at board level:
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以下示例显示了如何在板级上配置和启用FDCAN1实例:
 
 
 
   &m_can1 {
 
   &m_can1 {
 
   pinctrl-names = "default", "sleep";        {{highlight|/* configure pinctrl modes for m_can1 */}}
 
   pinctrl-names = "default", "sleep";        {{highlight|/* configure pinctrl modes for m_can1 */}}
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==How to configure the DT using STM32CubeMX==
 
==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 />
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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.
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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,该工具会在生成的设备树中插入 '''user sections''' 。 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==
 
==References==
Please refer to the following links for additional information:
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请参考以下链接以获取更多信息:
 
<references />
 
<references />

2020年11月6日 (五) 16:20的最新版本

Article purpose

本文介绍了如何配置FDCAN when it is assigned to the Linux® 操作系统。 在这种情况下,它由 CAN framework 用于Bosch M_CAN控制器。

使用 device tree机制执行配置,该机制提供了FDCAN外设的硬件描述,并由M_CAN Linux驱动程序和 NET/CAN 框架使用。

如果外围设备已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

M_CAN设备树绑定[1] 描述了所有必需和可选属性。

DT configuration

该硬件描述是 STM32 microprocessor 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)

所有M_CAN节点均在stm32mp157c.dtsi中进行了描述 [2] 文件,该文件具有禁用状态和必需的属性,例如:

  • 物理基址和设备寄存器映射的大小
  • 消息RAM地址和大小(CAN SRAM)
  • 主机时钟和CAN时钟
  • 消息RAM配置

这是一组属性,对于给定的STM32器件可能不会改变。

 m_can1: can@4400e000 {
 	compatible = "bosch,m_can";                       
 	reg = <0x4400e000 0x400>, <0x44011000 0x1400>;    /* FDCAN1 uses only the first half of the dedicated CAN_SRAM */
 	reg-names = "m_can", "message_ram";
 	interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>,
 		     <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
 	interrupt-names = "int0", "int1";
 	clocks = <&rcc CK_HSE>, <&rcc FDCAN_K>;
 	clock-names = "hclk", "cclk";
 	bosch,mram-cfg = <0x0 0 0 32 0 0 2 2>;
 	status = "disabled";
 };
 
 m_can2: can@4400f000 {
 	compatible = "bosch,m_can";
 	reg = <0x4400f000 0x400>, <0x44011000 0x2800>;    /* The 10 Kbytes of the CAN_SRAM are mapped */
 	reg-names = "m_can", "message_ram";
 	interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>,
 		     <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
 	interrupt-names = "int0", "int1";
 	clocks = <&rcc CK_HSE>, <&rcc FDCAN_K>;
 	clock-names = "hclk", "cclk";
 	bosch,mram-cfg = <0x1400 0 0 32 0 0 2 2>;         /* Set mram-cfg offset to write FDCAN2 data on the second half of the dedicated CAN_SRAM */
 	status = "disabled";
 };

bindings files中完整描述了必需和可选的属性。

Warning.png 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。

DT configuration (board level)

device tree 的一部分用于描述在给定板上使用的FDCAN硬件。 DT节点 ("m_can") 必须填写:

  • 通过设置 status = "okay".来启用CAN块。
  • 通过 pinctrl, through pinctrl-0 (default pins), pinctrl-1 (sleep pins) and pinctrl-names来配置正在使用的管脚。

DT configuration examples

以下示例显示了如何在板级上配置和启用FDCAN1实例:

 &m_can1 {
 	pinctrl-names = "default", "sleep";         /* configure pinctrl modes for m_can1 */
 	pinctrl-0 = <&m_can1_pins_a>;               /* configure m_can1_pins_a as default pinctrl configuration for m_can1 */
 	pinctrl-1 = <&m_can1_sleep_pins_a>;         /* configure m_can1_sleep_pins_a as sleep pinctrl configuration for m_can1 */
 	status = "okay";                            /* enable m_can1 */ 
 };

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,该工具会在生成的设备树中插入 user sections 。 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。