diff options
| author | Andres Salomon <dilinger@queued.net> | 2011-03-21 19:19:35 -0700 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2011-03-27 00:09:30 +0100 |
| commit | fa1df691688f34cbcd5bf77bd084bbe47e9d6bfe (patch) | |
| tree | 83df18f1d427115c0016a059535b04f2d600a2d0 /include/linux | |
| parent | 16c29dafcc86024048f1dbb8349d31cb22c7c55a (diff) | |
| download | lwn-fa1df691688f34cbcd5bf77bd084bbe47e9d6bfe.tar.gz lwn-fa1df691688f34cbcd5bf77bd084bbe47e9d6bfe.zip | |
mfd: Add mfd_clone_cell(), convert cs5535-mfd/olpc-xo1 to it
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mfd/core.h | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h index 1408bf8eed5f..ad1b19aa6508 100644 --- a/include/linux/mfd/core.h +++ b/include/linux/mfd/core.h @@ -63,6 +63,24 @@ 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 |