55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2024 Linaro Ltd.
|
|
*/
|
|
|
|
#ifndef __PCI_PWRCTL_H__
|
|
#define __PCI_PWRCTL_H__
|
|
|
|
#include <linux/notifier.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
struct device;
|
|
struct device_link;
|
|
|
|
/*
|
|
* This is a simple framework for solving the issue of PCI devices that require
|
|
* certain resources (regulators, GPIOs, clocks) to be enabled before the
|
|
* device can actually be detected on the PCI bus.
|
|
*
|
|
* The idea is to reuse the platform bus to populate OF nodes describing the
|
|
* PCI device and its resources, let these platform devices probe and enable
|
|
* relevant resources and then trigger a rescan of the PCI bus allowing for the
|
|
* same device (with a second associated struct device) to be registered with
|
|
* the PCI subsystem.
|
|
*
|
|
* To preserve a correct hierarchy for PCI power management and device reset,
|
|
* we create a device link between the power control platform device (parent)
|
|
* and the supplied PCI device (child).
|
|
*/
|
|
|
|
/**
|
|
* struct pci_pwrctl - PCI device power control context.
|
|
* @dev: Address of the power controlling device.
|
|
*
|
|
* An object of this type must be allocated by the PCI power control device and
|
|
* passed to the pwrctl subsystem to trigger a bus rescan and setup a device
|
|
* link with the device once it's up.
|
|
*/
|
|
struct pci_pwrctl {
|
|
struct device *dev;
|
|
|
|
/* Private: don't use. */
|
|
struct notifier_block nb;
|
|
struct device_link *link;
|
|
struct work_struct work;
|
|
};
|
|
|
|
void pci_pwrctl_init(struct pci_pwrctl *pwrctl, struct device *dev);
|
|
int pci_pwrctl_device_set_ready(struct pci_pwrctl *pwrctl);
|
|
void pci_pwrctl_device_unset_ready(struct pci_pwrctl *pwrctl);
|
|
int devm_pci_pwrctl_device_set_ready(struct device *dev,
|
|
struct pci_pwrctl *pwrctl);
|
|
|
|
#endif /* __PCI_PWRCTL_H__ */
|