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of/i2c: Fix module load order issue caused by of_i2c.c 

Commit 959e85f7, "i2c: add OF-style registration and binding" caused a
module dependency loop where of_i2c.c calls functions in i2c-core, and
i2c-core calls of_i2c_register_devices() in of_i2c.  This means that
when i2c support is built as a module when CONFIG_OF is set, then
neither i2c_core nor of_i2c are able to be loaded.

This patch fixes the problem by moving the of_i2c_register_devices()
calls back into the device drivers.  Device drivers already
specifically request the core code to parse the device tree for
devices anyway by setting the of_node pointer, so it isn't a big
deal to also call the registration function.  The drivers just become
slightly more verbose.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Grant Likely 2010-09-30 14:14:23 +02:00 committed by Jean Delvare
parent 64b4782fc9
commit 925bb9c649
4 changed files with 9 additions and 4 deletions
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5
drivers/i2c/busses/i2c-cpm.c
View File

@ -677,6 +677,11 @@ static int __devinit cpm_i2c_probe(struct platform_device *ofdev,
dev_dbg(&ofdev->dev, "hw routines for %s registered.\n",
cpm->adap.name);
/*
* register OF I2C devices
*/
of_i2c_register_devices(&cpm->adap);
return 0;
out_shut:
cpm_i2c_shutdown(cpm);

3
drivers/i2c/busses/i2c-ibm_iic.c
View File

@ -761,6 +761,9 @@ static int __devinit iic_probe(struct platform_device *ofdev,
dev_info(&ofdev->dev, "using %s mode\n",
dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)");
/* Now register all the child nodes */
of_i2c_register_devices(adap);
return 0;
error_cleanup:

1
drivers/i2c/busses/i2c-mpc.c
View File

@ -632,6 +632,7 @@ static int __devinit fsl_i2c_probe(struct platform_device *op,
dev_err(i2c->dev, "failed to add adapter\n");
goto fail_add;
}
of_i2c_register_devices(&i2c->adap);
return result;

4
drivers/i2c/i2c-core.c
View File

@ -32,7 +32,6 @@
#include <linux/init.h>
#include <linux/idr.h>
#include <linux/mutex.h>
#include <linux/of_i2c.h>
#include <linux/of_device.h>
#include <linux/completion.h>
#include <linux/hardirq.h>
@ -874,9 +873,6 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
if (adap->nr < __i2c_first_dynamic_bus_num)
i2c_scan_static_board_info(adap);
/* Register devices from the device tree */
of_i2c_register_devices(adap);
/* Notify drivers */
mutex_lock(&core_lock);
bus_for_each_drv(&i2c_bus_type, NULL, adap, __process_new_adapter);