详解linux电源管理驱动编写

  drivers/regulator 

  menuconfig REGULATOR     bool "Voltage and Current Regulator Support"     help      Generic Voltage and Current Regulator support.         This framework is designed to provide a generic interface to voltage      and current regulators within the Linux kernel. It's intended to      provide voltage and current control to client or consumer drivers and      also provide status information to user space applications through a      sysfs interface.         The intention is to allow systems to dynamically control regulator      output in order to save power and prolong battery life. This applies      to both voltage regulators (where voltage output is controllable) and      current sinks (where current output is controllable).         This framework safely compiles out if not selected so that client      drivers can still be used in systems with no software controllable      regulators.         If unsure, say no.   

  config REGULATOR_STM32_VREFBUF     tristate "STMicroelectronics STM32 VREFBUF"     depends on ARCH_STM32 || COMPILE_TEST     help      This driver supports STMicroelectronics STM32 VREFBUF (voltage      reference buffer) which can be used as voltage reference for      internal ADCs, DACs and also for external components through      dedicated Vref+ pin.         This driver can also be built as a module. If so, the module      will be called stm32-vrefbuf.   

  obj-$(CONFIG_REGULATOR) += core.o dummy.o fixed-helper.o helpers.o devres.o   obj-$(CONFIG_OF) += of_regulator.o   obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o   obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o   obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o      obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o 

  static const struct of_device_id stm32_vrefbuf_of_match[] = {     { .compatible = "st,stm32-vrefbuf", },     {},   };   MODULE_DEVICE_TABLE(of, stm32_vrefbuf_of_match);      static struct platform_driver stm32_vrefbuf_driver = {     .probe = stm32_vrefbuf_probe,     .remove = stm32_vrefbuf_remove,     .driver = {       .name = "stm32-vrefbuf",       .of_match_table = of_match_ptr(stm32_vrefbuf_of_match),     },   };   module_platform_driver(stm32_vrefbuf_driver);   

  static const struct regulator_ops stm32_vrefbuf_volt_ops = {     .enable   = stm32_vrefbuf_enable,     .disable  = stm32_vrefbuf_disable,     .is_enabled = stm32_vrefbuf_is_enabled,     .get_voltage_sel = stm32_vrefbuf_get_voltage_sel,     .set_voltage_sel = stm32_vrefbuf_set_voltage_sel,     .list_voltage  = regulator_list_voltage_table,   };      static const struct regulator_desc stm32_vrefbuf_regu = {     .name = "vref",     .supply_name = "vdda",     .volt_table = stm32_vrefbuf_voltages,     .n_voltages = ARRAY_SIZE(stm32_vrefbuf_voltages),     .ops = &stm32_vrefbuf_volt_ops,     .type = REGULATOR_VOLTAGE,     .owner = THIS_MODULE,   };   

  rdev = regulator_register(&stm32_vrefbuf_regu, &config);   if (IS_ERR(rdev)) {     ret = PTR_ERR(rdev);     dev_err(&pdev->dev, "register failed with error %dn", ret);     goto err_clk_dis;   }   platform_set_drvdata(pdev, rdev);   

  vrefbuf: regulator@58003C00 {     compatible = "st,stm32-vrefbuf";     reg = <0x58003C00 0x8>;     clocks = <&rcc VREF_CK>;     regulator-min-microvolt = <1500000>;     regulator-max-microvolt = <2500000>;     status = "disabled";   };