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| author | Stepan Moskovchenko <stepanm@codeaurora.org> | 2012-12-06 14:55:41 -0800 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2013-02-06 11:06:35 +0000 |
| commit | ced4eec900850627409d7ff566b009471162b56b (patch) | |
| tree | eaa6551cbc421108d049e65855cdf618baa02117 /drivers/of/device.c | |
| parent | 88b62b915b0b7e25870eb0604ed9a92ba4bfc9f7 (diff) | |
| download | linux-ced4eec900850627409d7ff566b009471162b56b.tar.bz2 | |
of: Output devicetree alias names in uevent
In some situations, userspace may want to resolve a
device by function and logical number (ie, "serial0")
rather than by the base address or full device path. Being
able to resolve a device by alias frees userspace from the
burden of otherwise having to maintain a mapping between
device addresses and their logical assignments on each
platform when multiple instances of the same hardware block
are present in the system.
Although the uevent device attribute contains devicetree
compatible information and the full device path, the uevent
does not list the alises that may have been defined for the
device.
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
[grant.likely: Removed OF_ALIAS_N field; I don't think it's needed]
[grant.likely: Added #ifndef _LINUX_OF_PRIVATE_H wrapper]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of/device.c')
| -rw-r--r-- | drivers/of/device.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c index 4c74e4fc5a51..f685e55e0717 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -8,6 +8,7 @@ #include <linux/slab.h> #include <asm/errno.h> +#include "of_private.h" /** * of_match_device - Tell if a struct device matches an of_device_id list @@ -131,6 +132,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) { const char *compat; + struct alias_prop *app; int seen = 0, cplen, sl; if ((!dev) || (!dev->of_node)) @@ -153,6 +155,17 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) seen++; } add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); + + seen = 0; + mutex_lock(&of_aliases_mutex); + list_for_each_entry(app, &aliases_lookup, link) { + if (dev->of_node == app->np) { + add_uevent_var(env, "OF_ALIAS_%d=%s", seen, + app->alias); + seen++; + } + } + mutex_unlock(&of_aliases_mutex); } int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |