1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <linux/pci-pwrctrl.h>
28 	if (dev_fwnode(dev) != dev_fwnode(pwrctrl->dev))  in pci_pwrctrl_notify()
35 		 * drivers on different buses but consuming the same DT node. We  in pci_pwrctrl_notify()
40 		 * power control platform device. Mark its OF node as reused.  in pci_pwrctrl_notify()
42 		dev->of_node_reused = true;  in pci_pwrctrl_notify()
50  * pci_pwrctrl_init() - Initialize the PCI power control context struct
57 	pwrctrl->dev = dev;  in pci_pwrctrl_init()
63  * pci_pwrctrl_device_set_ready() - Notify the pwrctrl subsystem that the PCI
64  * device is powered-up and ready to be detected.
80 	if (!pwrctrl->dev)  in pci_pwrctrl_device_set_ready()
81 		return -ENODEV;  in pci_pwrctrl_device_set_ready()
83 	pwrctrl->nb.notifier_call = pci_pwrctrl_notify;  in pci_pwrctrl_device_set_ready()
84 	ret = bus_register_notifier(&pci_bus_type, &pwrctrl->nb);  in pci_pwrctrl_device_set_ready()
93  * pci_pwrctrl_device_unset_ready() - Notify the pwrctrl subsystem that the PCI
94  * device is about to be powered-down.
103 	 * it is being detached then the child PCI device must have already  in pci_pwrctrl_device_unset_ready()
106 	bus_unregister_notifier(&pci_bus_type, &pwrctrl->nb);  in pci_pwrctrl_device_unset_ready()
118  * devm_pci_pwrctrl_device_set_ready - Managed variant of
149 	return pwrctrl->power_off(pwrctrl);  in __pci_pwrctrl_power_off_device()
157 	for_each_available_child_of_node_scoped(np, child)  in pci_pwrctrl_power_off_device()
158 		pci_pwrctrl_power_off_device(child);  in pci_pwrctrl_power_off_device()
164 	if (device_is_bound(&pdev->dev)) {  in pci_pwrctrl_power_off_device()
165 		ret = __pci_pwrctrl_power_off_device(&pdev->dev);  in pci_pwrctrl_power_off_device()
167 			dev_err(&pdev->dev, "Failed to power off device: %d", ret);  in pci_pwrctrl_power_off_device()
174  * pci_pwrctrl_power_off_devices - Power off pwrctrl devices
184 	struct device_node *np = parent->of_node;  in pci_pwrctrl_power_off_devices()
186 	for_each_available_child_of_node_scoped(np, child)  in pci_pwrctrl_power_off_devices()
187 		pci_pwrctrl_power_off_device(child);  in pci_pwrctrl_power_off_devices()
198 	return pwrctrl->power_on(pwrctrl);  in __pci_pwrctrl_power_on_device()
210 	for_each_available_child_of_node_scoped(np, child) {  in pci_pwrctrl_power_on_device()
211 		ret = pci_pwrctrl_power_on_device(child);  in pci_pwrctrl_power_on_device()
220 	if (device_is_bound(&pdev->dev)) {  in pci_pwrctrl_power_on_device()
221 		ret = __pci_pwrctrl_power_on_device(&pdev->dev);  in pci_pwrctrl_power_on_device()
224 		dev_dbg(&pdev->dev, "driver is not bound\n");  in pci_pwrctrl_power_on_device()
225 		ret = -EPROBE_DEFER;  in pci_pwrctrl_power_on_device()
234  * pci_pwrctrl_power_on_devices - Power on pwrctrl devices
242  * Return: 0 on success, -EPROBE_DEFER if any pwrctrl driver is not bound, an
247 	struct device_node *np = parent->of_node;  in pci_pwrctrl_power_on_devices()
248 	struct device_node *child = NULL;  in pci_pwrctrl_power_on_devices()  local
251 	for_each_available_child_of_node(np, child) {  in pci_pwrctrl_power_on_devices()
252 		ret = pci_pwrctrl_power_on_device(child);  in pci_pwrctrl_power_on_devices()
261 		if (tmp == child)  in pci_pwrctrl_power_on_devices()
265 	of_node_put(child);  in pci_pwrctrl_power_on_devices()
273  * pwrctrl device will only be created if the node satisfies below requirements:
277  * 2. At least one of the power supplies defined in the devicetree node of the
278  *    device (OR) in the remote endpoint parent node to indicate pwrctrl
319 	for_each_available_child_of_node_scoped(np, child) {  in pci_pwrctrl_create_device()
320 		ret = pci_pwrctrl_create_device(child, parent);  in pci_pwrctrl_create_device()
325 	/* Bail out if the platform device is already available for the node */  in pci_pwrctrl_create_device()
333 		dev_dbg(parent, "Skipping OF node: %s\n", np->name);  in pci_pwrctrl_create_device()
340 		dev_err(parent, "Failed to create pwrctrl device for node: %s\n", np->name);  in pci_pwrctrl_create_device()
341 		return -EINVAL;  in pci_pwrctrl_create_device()
348  * pci_pwrctrl_create_devices - Create pwrctrl devices
362 	for_each_available_child_of_node_scoped(parent->of_node, child) {  in pci_pwrctrl_create_devices()
363 		ret = pci_pwrctrl_create_device(child, parent);  in pci_pwrctrl_create_devices()
378 	for_each_available_child_of_node_scoped(np, child)  in pci_pwrctrl_destroy_device()
379 		pci_pwrctrl_destroy_device(child);  in pci_pwrctrl_destroy_device()
392  * pci_pwrctrl_destroy_devices - Destroy pwrctrl devices
401 	struct device_node *np = parent->of_node;  in pci_pwrctrl_destroy_devices()
403 	for_each_available_child_of_node_scoped(np, child)  in pci_pwrctrl_destroy_devices()
404 		pci_pwrctrl_destroy_device(child);  in pci_pwrctrl_destroy_devices()