linux-toradex.git/drivers/of/of_i2c.c, branch v3.6.4

of/i2c: implement of_find_i2c_adapter_by_node

2012-05-12T12:28:17+00:00

This finds the struct i2c_adapter * for a given device tree node. Just
like of_find_i2c_device_by_node.

Signed-off-by: Stephen Warren 
Signed-off-by: Wolfram Sang

of/i2c: call i2c_verify_client from of_find_i2c_device_by_node

2012-05-12T12:28:15+00:00

i2c_bus_type may contain both I2C clients and I2C adapters. Fix
of_find_i2c_device_by_node to call i2c_verify_client to ensure that it
only returns non-NULL of I2C clients.

Signed-off-by: Stephen Warren 
Acked-by: Rob Herring 
Signed-off-by: Wolfram Sang

of/i2c: Fix request module by alias

2010-12-24T08:28:54+00:00

If we are registering an i2c device that has a device tree node like
this real-world example:

      rtc@68 {
        compatible = "dallas,ds1337";
        reg = <0x68>;
      };

of_i2c_register_devices() will try to load a module called ds1337.ko.
There is no such module, so it will fail.  If we look in modules.alias
we will find entries like these:

.
.
.
alias i2c:ds1339 rtc_ds1307
alias i2c:ds1338 rtc_ds1307
alias i2c:ds1337 rtc_ds1307
alias i2c:ds1307 rtc_ds1307
alias i2c:ds1374 rtc_ds1374
.
.
.

The module we want is really called rtc_ds1307.ko.  If we request a
module called "i2c:ds1337", the userspace module loader will do the
right thing (unless it is busybox) and load rtc_ds1307.ko.  So we add
the I2C_MODULE_PREFIX to the request_module() string.

Signed-off-by: David Daney 
Signed-off-by: Grant Likely

of/mips: Cleanup some include directives/files.

2010-10-21T17:10:11+00:00

The __init directives should go on the definitions of things, not the
declaration, also __init is meaningless for inline functions, so
remove it from prom.h.  This allows us to get rid of a useless
#include, but most of the rest of them are useless too, so kill them
as well.

If of_i2c.c needs irq definitions, it should include linux/irq.h
directly, not assume indirect inclusion via asm/prom.h.

Signed-off-by: David Daney 
Acked-by: Ralf Baechle 
Signed-off-by: Grant Likely

of/i2c: Generalize OF support

2010-07-05T22:14:52+00:00

This patch cleans up the i2c OF support code to make it selectable by
all architectures and allow for automatic registration of i2c devices.

Signed-off-by: Grant Likely

of: eliminate of_device->node and dev_archdata->{of,prom}_node

2010-05-18T22:10:45+00:00

This patch eliminates the node pointer from struct of_device and the
of_node (or prom_node) pointer from struct dev_archdata since the node
pointer is now part of struct device proper when CONFIG_OF is set, and
all users of the old pointer locations have already been converted over
to use device->of_node.

Also remove dev_archdata_{get,set}_node() as it is no longer used by
anything.

Signed-off-by: Grant Likely

of: Always use 'struct device.of_node' to get device node pointer.

2010-05-18T22:10:44+00:00

The following structure elements duplicate the information in
'struct device.of_node' and so are being eliminated.  This patch
makes all readers of these elements use device.of_node instead.

(struct of_device *)->node
(struct dev_archdata *)->prom_node (sparc)
(struct dev_archdata *)->of_node (powerpc & microblaze)

Signed-off-by: Grant Likely

i2c/of: Allow device node to be passed via i2c_board_info

2010-04-29T00:21:56+00:00

The struct device_node *of_node pointer is moving out of dev->archdata
and into the struct device proper.  of_i2c.c needs to set the of_node
pointer before the device is registered.  Since the i2c subsystem
doesn't allow 2 stage allocation and registration of i2c devices, the
of_node pointer needs to be passed via the i2c_board_info structure
so that it is set prior to registration.

This patch adds of_node to struct i2c_board_info (conditional on
CONFIG_OF), sets of_node in i2c_new_device(), and modifies of_i2c.c
to use the new parameter.  The calling of dev_archdata_set_node()
from of_i2c will be removed in a subsequent patch when of_node is
removed from archdata and all users are converted over.

Signed-off-by: Grant Likely

of: assume big-endian properties, adding conversions where necessary

2010-02-09T15:34:10+00:00

Properties in the device tree are specified as big-endian. At present,
the only platforms to support device trees are also big-endian, so we've
been acessing the properties as raw values.

We'd like to add device tree support to little-endian platforms too, so
add endian conversion to the sites where we access property values in
the common of code.

Compiled on powerpc (ppc44x_defconfig & ppc64_defconfig) and arm (fdt
support only for now).

Signed-off-by: Jeremy Kerr 
Signed-off-by: Grant Likely

drivers/of: Add the of_find_i2c_device_by_node function.

2009-01-09T22:49:06+00:00

The of_find_i2c_device_by_node function allows you to follow a
reference in the device tree to an i2c device node and then locate
the linux device instantiated by the device tree. Example use: an I2S
bus driver finding the i2c_device instance for a codec described by
a device tree node.

This was waiting for Anton's i2c patches that were just added.

Signed-off-by: Jon Smirl 
Signed-off-by: Grant Likely