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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0848c94fb4
Currently the MFD core supports remapping MFD cell interrupts using an irqdomain but only if the MFD is being instantiated using device tree and only if the device tree bindings use the pattern of registering IPs in the device tree with compatible properties. This will be actively harmful for drivers which support non-DT platforms and use this pattern for their DT bindings as it will mean that the core will silently change remapping behaviour and it is also limiting for drivers which don't do DT with this particular pattern. There is also a potential fragility if there are interrupts not associated with MFD cells and all the cells are omitted from the device tree for some reason. Instead change the code to take an IRQ domain as an optional argument, allowing drivers to take the decision about the parent domain for their interrupts. The one current user of this feature is ab8500-core, it has the domain lookup pushed out into the driver. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* drivers/mfd/mfd-core.h
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*
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* core MFD support
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* Copyright (c) 2006 Ian Molton
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* Copyright (c) 2007 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef MFD_CORE_H
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#define MFD_CORE_H
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#include <linux/platform_device.h>
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struct irq_domain;
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/*
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* This struct describes the MFD part ("cell").
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* After registration the copy of this structure will become the platform data
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* of the resulting platform_device
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*/
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struct mfd_cell {
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const char *name;
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int id;
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/* refcounting for multiple drivers to use a single cell */
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atomic_t *usage_count;
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int (*enable)(struct platform_device *dev);
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int (*disable)(struct platform_device *dev);
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int (*suspend)(struct platform_device *dev);
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int (*resume)(struct platform_device *dev);
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/* platform data passed to the sub devices drivers */
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void *platform_data;
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size_t pdata_size;
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/*
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* Device Tree compatible string
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* See: Documentation/devicetree/usage-model.txt Chapter 2.2 for details
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*/
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const char *of_compatible;
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/*
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* These resources can be specified relative to the parent device.
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* For accessing hardware you should use resources from the platform dev
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*/
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int num_resources;
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const struct resource *resources;
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/* don't check for resource conflicts */
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bool ignore_resource_conflicts;
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/*
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* Disable runtime PM callbacks for this subdevice - see
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* pm_runtime_no_callbacks().
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*/
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bool pm_runtime_no_callbacks;
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};
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/*
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* Convenience functions for clients using shared cells. Refcounting
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* happens automatically, with the cell's enable/disable callbacks
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* being called only when a device is first being enabled or no other
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* clients are making use of it.
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*/
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extern int mfd_cell_enable(struct platform_device *pdev);
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extern int mfd_cell_disable(struct platform_device *pdev);
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/*
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* "Clone" multiple platform devices for a single cell. This is to be used
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* for devices that have multiple users of a cell. For example, if an mfd
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* driver wants the cell "foo" to be used by a GPIO driver, an MTD driver,
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* and a platform driver, the following bit of code would be use after first
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* calling mfd_add_devices():
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*
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* const char *fclones[] = { "foo-gpio", "foo-mtd" };
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* err = mfd_clone_cells("foo", fclones, ARRAY_SIZE(fclones));
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*
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* Each driver (MTD, GPIO, and platform driver) would then register
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* platform_drivers for "foo-mtd", "foo-gpio", and "foo", respectively.
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* The cell's .enable/.disable hooks should be used to deal with hardware
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* resource contention.
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*/
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extern int mfd_clone_cell(const char *cell, const char **clones,
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size_t n_clones);
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/*
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* Given a platform device that's been created by mfd_add_devices(), fetch
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* the mfd_cell that created it.
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*/
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static inline const struct mfd_cell *mfd_get_cell(struct platform_device *pdev)
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{
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return pdev->mfd_cell;
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}
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extern int mfd_add_devices(struct device *parent, int id,
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struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base, struct irq_domain *irq_domain);
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extern void mfd_remove_devices(struct device *parent);
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#endif
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