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mfd: Add mfd_clone_cell(), convert cs5535-mfd/olpc-xo1 to it

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Replace mfd_shared_platform_driver_register with mfd_clone_cell.  The
former was called by an mfd client, and registered both a platform driver
and device.  The latter is called by an mfd driver, and registers only a
platform device.

The downside of this is that mfd drivers need to be modified whenever
new clients are added that share a cell; the upside is that it fits
Linux's driver model better.  It's also simpler.

This also converts cs5535-mfd/olpc-xo1 from the old API.  cs5535-mfd
now creates the olpc-xo1-{acpi,pms} devices, while olpc-xo1 binds to
them via platform drivers.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Andres Salomon
2011-03-21 19:19:35 -07:00
committed by Samuel Ortiz
parent 16c29dafcc
commit fa1df69168
4 changed files with 53 additions and 58 deletions
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27
include/linux/mfd/core.h
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@@ -62,6 +62,24 @@ struct mfd_cell {
extern int mfd_cell_enable(struct platform_device *pdev);
extern int mfd_cell_disable(struct platform_device *pdev);
/*
* "Clone" multiple platform devices for a single cell. This is to be used
* for devices that have multiple users of a cell. For example, if an mfd
* driver wants the cell "foo" to be used by a GPIO driver, an MTD driver,
* and a platform driver, the following bit of code would be use after first
* calling mfd_add_devices():
*
* const char *fclones[] = { "foo-gpio", "foo-mtd" };
* err = mfd_clone_cells("foo", fclones, ARRAY_SIZE(fclones));
*
* Each driver (MTD, GPIO, and platform driver) would then register
* platform_drivers for "foo-mtd", "foo-gpio", and "foo", respectively.
* The cell's .enable/.disable hooks should be used to deal with hardware
* resource contention.
*/
extern int mfd_clone_cell(const char *cell, const char **clones,
size_t n_clones);
/*
* Given a platform device that's been created by mfd_add_devices(), fetch
* the mfd_cell that created it.
@@ -87,13 +105,4 @@ extern int mfd_add_devices(struct device *parent, int id,
extern void mfd_remove_devices(struct device *parent);
/*
* For MFD drivers with clients sharing access to resources, these create
* multiple platform devices per cell. Contention handling must still be
* handled via drivers (ie, with enable/disable hooks).
*/
extern int mfd_shared_platform_driver_register(struct platform_driver *drv,
const char *cellname);
extern void mfd_shared_platform_driver_unregister(struct platform_driver *drv);
#endif