forked from mirrors/linux
3f925cd628
Rename pwrctrl functions and structures from "pwrctl" to "pwrctrl" to match the similar file renames. Link: https://lore.kernel.org/r/20241115214428.2061153-3-helgaas@kernel.org Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Acked-by: Krzysztof Wilczyński <kw@linux.com>
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2024 Linaro Ltd.
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*/
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#ifndef __PCI_PWRCTRL_H__
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#define __PCI_PWRCTRL_H__
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#include <linux/notifier.h>
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#include <linux/workqueue.h>
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struct device;
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struct device_link;
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/*
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* This is a simple framework for solving the issue of PCI devices that require
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* certain resources (regulators, GPIOs, clocks) to be enabled before the
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* device can actually be detected on the PCI bus.
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*
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* The idea is to reuse the platform bus to populate OF nodes describing the
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* PCI device and its resources, let these platform devices probe and enable
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* relevant resources and then trigger a rescan of the PCI bus allowing for the
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* same device (with a second associated struct device) to be registered with
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* the PCI subsystem.
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*
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* To preserve a correct hierarchy for PCI power management and device reset,
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* we create a device link between the power control platform device (parent)
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* and the supplied PCI device (child).
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*/
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/**
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* struct pci_pwrctrl - PCI device power control context.
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* @dev: Address of the power controlling device.
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*
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* An object of this type must be allocated by the PCI power control device and
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* passed to the pwrctrl subsystem to trigger a bus rescan and setup a device
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* link with the device once it's up.
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*/
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struct pci_pwrctrl {
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struct device *dev;
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/* Private: don't use. */
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struct notifier_block nb;
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struct device_link *link;
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struct work_struct work;
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};
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void pci_pwrctrl_init(struct pci_pwrctrl *pwrctrl, struct device *dev);
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int pci_pwrctrl_device_set_ready(struct pci_pwrctrl *pwrctrl);
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void pci_pwrctrl_device_unset_ready(struct pci_pwrctrl *pwrctrl);
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int devm_pci_pwrctrl_device_set_ready(struct device *dev,
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struct pci_pwrctrl *pwrctrl);
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#endif /* __PCI_PWRCTRL_H__ */
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