drivers: power_domain: gpio controlled domain
Initial implementation of a simple GPIO controlled power domain. It exposes no API of its own, all functionality is contained inside the runtime power management callbacks. Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
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6 changed files with 165 additions and 0 deletions
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@ -46,6 +46,7 @@ add_subdirectory_ifdef(CONFIG_REGULATOR regulator)
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add_subdirectory_ifdef(CONFIG_MEMC memc)
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add_subdirectory_ifdef(CONFIG_VIRTUALIZATION virtualization)
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add_subdirectory_ifdef(CONFIG_PM_CPU_OPS pm_cpu_ops)
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add_subdirectory_ifdef(CONFIG_POWER_DOMAIN power_domain)
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add_subdirectory_ifdef(CONFIG_FLASH_HAS_DRIVER_ENABLED flash)
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add_subdirectory_ifdef(CONFIG_SERIAL_HAS_DRIVER serial)
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@ -129,4 +129,6 @@ source "drivers/mbox/Kconfig"
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source "drivers/mm/Kconfig"
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source "drivers/power_domain/Kconfig"
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endmenu
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6
drivers/power_domain/CMakeLists.txt
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6
drivers/power_domain/CMakeLists.txt
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# Copyright (c) 2022, CSIRO
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# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources_ifdef(CONFIG_POWER_DOMAIN_GPIO power_domain_gpio.c)
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15
drivers/power_domain/Kconfig
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15
drivers/power_domain/Kconfig
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# Copyright (c) 2022, CSIRO.
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# SPDX-License-Identifier: Apache-2.0
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menuconfig POWER_DOMAIN
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bool "Power domain drivers"
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help
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Include drivers for power domains in system config
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if POWER_DOMAIN
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config POWER_DOMAIN_GPIO
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bool "GPIO controlled power domain"
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depends on GPIO
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endif
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109
drivers/power_domain/power_domain_gpio.c
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109
drivers/power_domain/power_domain_gpio.c
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@ -0,0 +1,109 @@
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/*
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* Copyright (c) 2022, Commonwealth Scientific and Industrial Research
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* Organisation (CSIRO) ABN 41 687 119 230.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT power_domain_gpio
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#include <kernel.h>
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#include <drivers/gpio.h>
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#include <pm/device.h>
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#include <pm/device_runtime.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(power_domain_gpio, LOG_LEVEL_INF);
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struct pd_gpio_config {
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struct gpio_dt_spec enable;
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uint32_t startup_delay_us;
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uint32_t off_on_delay_us;
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};
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struct pd_gpio_data {
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k_timeout_t last_boot;
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};
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const char *actions[] = {
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[PM_DEVICE_ACTION_RESUME] = "RESUME",
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[PM_DEVICE_ACTION_SUSPEND] = "SUSPEND",
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[PM_DEVICE_ACTION_TURN_ON] = "TURN ON",
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[PM_DEVICE_ACTION_TURN_OFF] = "TURN OFF"
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};
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static int pd_gpio_pm_action(const struct device *dev,
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enum pm_device_action action)
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{
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const struct pd_gpio_config *cfg = dev->config;
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int rc = 0;
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switch (action) {
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case PM_DEVICE_ACTION_RESUME:
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/* Switch power on */
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gpio_pin_set_dt(&cfg->enable, 1);
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LOG_DBG("%s is now ON", dev->name);
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/* Notify supported devices they are now powered */
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pm_device_children_action_run(dev, PM_DEVICE_ACTION_TURN_ON, NULL);
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break;
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case PM_DEVICE_ACTION_SUSPEND:
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/* Notify supported devices power is going down */
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pm_device_children_action_run(dev, PM_DEVICE_ACTION_TURN_OFF, NULL);
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/* Switch power off */
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gpio_pin_set_dt(&cfg->enable, 0);
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LOG_DBG("%s is now OFF and powered", dev->name);
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break;
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case PM_DEVICE_ACTION_TURN_ON:
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/* Actively control the enable pin now that the device is powered */
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gpio_pin_configure_dt(&cfg->enable, GPIO_OUTPUT_INACTIVE);
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LOG_DBG("%s is OFF and powered", dev->name);
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break;
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case PM_DEVICE_ACTION_TURN_OFF:
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/* Let the enable pin float while device is not powered */
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gpio_pin_configure_dt(&cfg->enable, GPIO_DISCONNECTED);
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LOG_DBG("%s is OFF and not powered", dev->name);
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break;
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default:
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rc = -ENOTSUP;
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}
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return rc;
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}
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static int pd_gpio_init(const struct device *dev)
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{
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const struct pd_gpio_config *cfg = dev->config;
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int rc;
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if (!device_is_ready(cfg->enable.port)) {
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LOG_ERR("GPIO port %s is not ready", cfg->enable.port->name);
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return -ENODEV;
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}
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if (pm_device_on_power_domain(dev)) {
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/* Device is unpowered */
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pm_device_runtime_init_off(dev);
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rc = gpio_pin_configure_dt(&cfg->enable, GPIO_DISCONNECTED);
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} else {
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pm_device_runtime_init_suspended(dev);
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rc = gpio_pin_configure_dt(&cfg->enable, GPIO_OUTPUT_INACTIVE);
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}
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return rc;
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}
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#define POWER_DOMAIN_DEVICE(id) \
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static const struct pd_gpio_config pd_gpio_##id##_cfg = { \
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.enable = GPIO_DT_SPEC_INST_GET(id, enable_gpios), \
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.startup_delay_us = DT_INST_PROP(id, startup_delay_us), \
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.off_on_delay_us = DT_INST_PROP(id, off_on_delay_us), \
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}; \
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static struct pd_gpio_data pd_gpio_##id##_data; \
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PM_DEVICE_DT_INST_DEFINE(id, pd_gpio_pm_action); \
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DEVICE_DT_INST_DEFINE(id, pd_gpio_init, PM_DEVICE_DT_INST_GET(id), \
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&pd_gpio_##id##_data, &pd_gpio_##id##_cfg, \
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POST_KERNEL, 75, \
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NULL);
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DT_INST_FOREACH_STATUS_OKAY(POWER_DOMAIN_DEVICE)
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32
dts/bindings/power-domain/power-domain-gpio.yaml
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32
dts/bindings/power-domain/power-domain-gpio.yaml
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# Copyright (c) 2022, CSIRO
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# SPDX-License-Identifier: Apache-2.0
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description: Simple GPIO controlled power domain
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compatible: "power-domain-gpio"
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include: power-domain.yaml
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properties:
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enable-gpios:
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type: phandle-array
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required: true
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description: |
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GPIO to use to enable/disable the regulator.
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Unlike the gpio property in the Linux bindings this array must
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provide the GPIO polarity and open-drain status in the phandle
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selector. The Linux enable-active-high and gpio-open-drain
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properties are not valid for Zephyr devicetree files.
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startup-delay-us:
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type: int
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required: false
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default: 0
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description: Startup time, in microseconds
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off-on-delay-us:
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type: int
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required: false
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default: 0
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description: Off delay time, in microseconds
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