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author | David Brownell <david-b@pacbell.net> | 2007-05-11 09:36:14 +0400 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-06-08 23:41:07 +0400 |
commit | adfdebceaca988515ecdb557d600fd5ab9da913a (patch) | |
tree | 1901214d144b0380064b181bfa4681143220b009 | |
parent | 85f6038f2170e3335dda09c3dfb0f83110e87019 (diff) | |
download | linux-adfdebceaca988515ecdb557d600fd5ab9da913a.tar.xz |
update Documentation/driver-model/platform.txt
Make note of the legacy "probe-the-hardware" drivers, and some APIs that
are mostly unused except by such drivers. We probably can't escape having
legacy drivers for a while (e.g. old ISA drivers), but we can at least
discourage this style code for new drivers, and unless it's unavoidable.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Andres Salomon <dilinger@debian.org>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | Documentation/driver-model/platform.txt | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Documentation/driver-model/platform.txt b/Documentation/driver-model/platform.txt index 19c4a6e13676..2a97320ee17f 100644 --- a/Documentation/driver-model/platform.txt +++ b/Documentation/driver-model/platform.txt @@ -96,6 +96,46 @@ System setup also associates those clocks with the device, so that that calls to clk_get(&pdev->dev, clock_name) return them as needed. +Legacy Drivers: Device Probing +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Some drivers are not fully converted to the driver model, because they take +on a non-driver role: the driver registers its platform device, rather than +leaving that for system infrastructure. Such drivers can't be hotplugged +or coldplugged, since those mechanisms require device creation to be in a +different system component than the driver. + +The only "good" reason for this is to handle older system designs which, like +original IBM PCs, rely on error-prone "probe-the-hardware" models for hardware +configuration. Newer systems have largely abandoned that model, in favor of +bus-level support for dynamic configuration (PCI, USB), or device tables +provided by the boot firmware (e.g. PNPACPI on x86). There are too many +conflicting options about what might be where, and even educated guesses by +an operating system will be wrong often enough to make trouble. + +This style of driver is discouraged. If you're updating such a driver, +please try to move the device enumeration to a more appropriate location, +outside the driver. This will usually be cleanup, since such drivers +tend to already have "normal" modes, such as ones using device nodes that +were created by PNP or by platform device setup. + +None the less, there are some APIs to support such legacy drivers. Avoid +using these calls except with such hotplug-deficient drivers. + + struct platform_device *platform_device_alloc( + char *name, unsigned id); + +You can use platform_device_alloc() to dynamically allocate a device, which +you will then initialize with resources and platform_device_register(). +A better solution is usually: + + struct platform_device *platform_device_register_simple( + char *name, unsigned id, + struct resource *res, unsigned nres); + +You can use platform_device_register_simple() as a one-step call to allocate +and register a device. + + Device Naming and Driver Binding ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The platform_device.dev.bus_id is the canonical name for the devices. |