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

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== Article purpose ==
 
== Article purpose ==
This article explains how to configure the [[RTC internal peripheral|'''RTC''' internal peripheral]] when it is assigned to the Linux<sup>&reg;</sup> OS. In this case, it is controlled by the [[RTC overview|RTC framework]].
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本文介绍了将 [[RTC internal peripheral|'''RTC''' internal peripheral]] 分配给 Linux<sup>&reg;</sup> OS. 时如何配置。 在这种情况下,它由[[RTC overview|RTC framework]]控制。
  
The configuration is performed using the [[Device tree|device tree]] mechanism that provides a hardware description of the RTC peripheral used by the STM32 RTC Linux driver.
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使用 [[Device tree|device tree]]机制执行配置,该机制提供STM32 RTC Linux驱动程序使用的RTC外设的硬件描述。
  
 
== DT bindings documentation ==
 
== DT bindings documentation ==
  
The [[RTC internal peripheral|'''RTC''']] is represented by the ''STM32 RTC device tree bindings''<ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt | Device tree bindings}}</ref>
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[[RTC internal peripheral|'''RTC''']]由“ STM32 RTC设备树绑定”表示<ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt | Device tree bindings}}</ref>
  
 
== 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]
 
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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]].
'''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.
 
  
 
===DT configuration (STM32 level) ===
 
===DT configuration (STM32 level) ===
The '''RTC''' node is declared in the file ''stm32mp157c.dtsi'' <ref>{{CodeSource|Linux kernel|arch/arm/boot/dts/stm32mp157c.dtsi|STM32MP157C device tree}}</ref>. It describes the hardware register address, clocks and interrupts.
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T在文件“ stm32mp157c.dtsi”中声明了''' RTC'''节点<ref>{{CodeSource|Linux kernel|arch/arm/boot/dts/stm32mp157c.dtsi|STM32MP157C device tree}}</ref>. 它描述了硬件寄存器地址,时钟和中断。
  
 
  rtc: rtc@5c004000 {
 
  rtc: rtc@5c004000 {
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  status = "disabled";
 
  status = "disabled";
 
  };
 
  };
{{Warning|This device tree part is related to STM32 microprocessors. It should 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。 它应该保持原样,而不要由最终用户修改。}}
  
 
=== DT configuration (board level) ===
 
=== DT configuration (board level) ===
This part is used to enable the '''RTC''' used on a board, which is done by setting the '''status''' property to '''okay'''.
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该部分用于启用板上使用的'''RTC''',这是通过将''' status'''属性设置为''' okay'''来完成的。
  
An "st,lsco" property is available to select and enable the RTC output on which RTC low-speed clock is output. The valid ouput values are defined in <ref>{{CodeSource|Linux kernel|include/dt-bindings/rtc/rtc-stm32.h|STM32 RTC bindings constants}}</ref>. A pinctrl state named "default" can be defined to reserve a pin for the RTC output.
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“ st,lsco”属性可用于选择和启用在其上输出RTC低速时钟的RTC输出。 有效的输出值在<ref>{{CodeSource|Linux kernel|include/dt-bindings/rtc/rtc-stm32.h|STM32 RTC bindings constants}}</ref>. 中定义。 可以定义一个名为“默认”的pinctrl状态来为RTC输出保留一个引脚。
  
 
=== DT configuration examples ===
 
=== DT configuration examples ===
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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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[[STM32CubeMX]] 工具可用于配置STM32MPU设备并获取相应的[[Device_tree#STM32|platform configuration device tree]] .<br />
STM32CubeMX might 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可能不支持上述所有属性[[#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==
 
==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 />
 
<noinclude>
 
[[Category:Device tree configuration]]
 
[[Category:RTC|1]]
 
{{PublicationRequestId | 15043 | 2020-02-21}}
 
{{ArticleBasedOnModel|Peripheral or framework device tree configuration model}}
 
</noinclude>
 

2020年11月10日 (二) 09:59的最新版本

Article purpose

本文介绍了将 RTC internal peripheral 分配给 Linux® OS. 时如何配置。 在这种情况下,它由RTC framework控制。

使用 device tree机制执行配置,该机制提供STM32 RTC Linux驱动程序使用的RTC外设的硬件描述。

DT bindings documentation

RTC由“ STM32 RTC设备树绑定”表示[1]

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)

T在文件“ stm32mp157c.dtsi”中声明了 RTC节点[2]. 它描述了硬件寄存器地址,时钟和中断。

rtc: rtc@5c004000 {
	compatible = "st,stm32mp1-rtc";
	reg = <0x5c004000 0x400>;                               --> Register location and length
	clocks = <&rcc RTCAPB>, <&rcc RTC>;
	clock-names = "pclk", "rtc_ck";
	interrupts-extended = <&intc GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
			      <&exti 19 1>;
	status = "disabled";
};
Warning.png 该设备树部分与STM32微处理器有关。 它应该保持原样,而不要由最终用户修改。

DT configuration (board level)

该部分用于启用板上使用的RTC,这是通过将 status属性设置为 okay来完成的。

“ st,lsco”属性可用于选择和启用在其上输出RTC低速时钟的RTC输出。 有效的输出值在[3]. 中定义。 可以定义一个名为“默认”的pinctrl状态来为RTC输出保留一个引脚。

DT configuration examples

#include <dt-bindings/rtc/rtc-stm32.h>
...
&rtc {
	st,lsco = <RTC_OUT2_RMP>;
	pinctrl-0 = <&rtc_out2_rmp_pins_a>;
	pinctrl-names = "default";
};

How to configure the DT using STM32CubeMX

STM32CubeMX 工具可用于配置STM32MPU设备并获取相应的platform configuration device tree .
STM32CubeMX可能不支持上述所有属性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。