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iio: add child nodes support in iio backend framework

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Add an API to support IIO generic channels binding:
http://devicetree.org/schemas/iio/adc/adc.yaml#
This new API is needed, as generic channel DT node isn't populated as a
device.
Add devm_iio_backend_fwnode_get() to allow an IIO device backend
consumer to reference backend phandles in its child nodes.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240730084640.1307938-4-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Olivier Moysan 2024-07-30 10:46:33 +02:00 committed by Jonathan Cameron
parent 2530d7d44c
commit c464cc610f
2 changed files with 44 additions and 16 deletions
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57
drivers/iio/industrialio-backend.c
View File

@ -718,19 +718,10 @@ static int __devm_iio_backend_get(struct device *dev, struct iio_backend *back)
return 0;
}
/**
* devm_iio_backend_get - Device managed backend device get
* @dev: Consumer device for the backend
* @name: Backend name
*
* Get's the backend associated with @dev.
*
* RETURNS:
* A backend pointer, negative error pointer otherwise.
*/
struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name,
struct fwnode_handle *fwnode)
{
struct fwnode_handle *fwnode;
struct fwnode_handle *fwnode_back;
struct iio_backend *back;
unsigned int index;
int ret;
@ -745,17 +736,17 @@ struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
index = 0;
}
fwnode = fwnode_find_reference(dev_fwnode(dev), "io-backends", index);
fwnode_back = fwnode_find_reference(fwnode, "io-backends", index);
if (IS_ERR(fwnode))
return dev_err_cast_probe(dev, fwnode,
"Cannot get Firmware reference\n");
guard(mutex)(&iio_back_lock);
list_for_each_entry(back, &iio_back_list, entry) {
if (!device_match_fwnode(back->dev, fwnode))
if (!device_match_fwnode(back->dev, fwnode_back))
continue;
fwnode_handle_put(fwnode);
fwnode_handle_put(fwnode_back);
ret = __devm_iio_backend_get(dev, back);
if (ret)
return ERR_PTR(ret);
@ -766,11 +757,45 @@ struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
return back;
}
fwnode_handle_put(fwnode);
fwnode_handle_put(fwnode_back);
return ERR_PTR(-EPROBE_DEFER);
}
/**
* devm_iio_backend_get - Device managed backend device get
* @dev: Consumer device for the backend
* @name: Backend name
*
* Get's the backend associated with @dev.
*
* RETURNS:
* A backend pointer, negative error pointer otherwise.
*/
struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
{
return __devm_iio_backend_fwnode_get(dev, name, dev_fwnode(dev));
}
EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get, IIO_BACKEND);
/**
* devm_iio_backend_fwnode_get - Device managed backend firmware node get
* @dev: Consumer device for the backend
* @name: Backend name
* @fwnode: Firmware node of the backend consumer
*
* Get's the backend associated with a firmware node.
*
* RETURNS:
* A backend pointer, negative error pointer otherwise.
*/
struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev,
const char *name,
struct fwnode_handle *fwnode)
{
return __devm_iio_backend_fwnode_get(dev, name, fwnode);
}
EXPORT_SYMBOL_NS_GPL(devm_iio_backend_fwnode_get, IIO_BACKEND);
/**
* __devm_iio_backend_get_from_fwnode_lookup - Device managed fwnode backend device get
* @dev: Consumer device for the backend

3
include/linux/iio/backend.h
View File

@ -176,6 +176,9 @@ int iio_backend_extend_chan_spec(struct iio_backend *back,
struct iio_chan_spec *chan);
void *iio_backend_get_priv(const struct iio_backend *conv);
struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name);
struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev,
const char *name,
struct fwnode_handle *fwnode);
struct iio_backend *
__devm_iio_backend_get_from_fwnode_lookup(struct device *dev,
struct fwnode_handle *fwnode);