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iio: backend: add devm_iio_backend_get_by_index()

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Add a new function to get an IIO backend by its index in the
io-backends device tree property. This is useful for multi-channel
devices that have multiple backends, where looking up by index is
more straightforward than using named backends.

Extract __devm_iio_backend_fwnode_get_by_index() from the existing
__devm_iio_backend_fwnode_get(), taking the index directly as a
parameter. The new public API devm_iio_backend_get_by_index() uses
the index to find the backend reference in the io-backends property,
avoiding the need for io-backend-names.

Reviewed-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Antoniu Miclaus
2026-04-20 13:12:23 +03:00
committed by Jonathan Cameron
parent 793e056d44
commit 129c549981
2 changed files with 39 additions and 15 deletions
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53
drivers/iio/industrialio-backend.c
View File

@@ -964,23 +964,13 @@ int iio_backend_data_transfer_addr(struct iio_backend *back, u32 address)
}
EXPORT_SYMBOL_NS_GPL(iio_backend_data_transfer_addr, "IIO_BACKEND");
static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name,
struct fwnode_handle *fwnode)
static struct iio_backend *__devm_iio_backend_fwnode_get_by_index(struct device *dev,
struct fwnode_handle *fwnode,
unsigned int index)
{
struct iio_backend *back;
unsigned int index;
int ret;
if (name) {
ret = device_property_match_string(dev, "io-backend-names",
name);
if (ret < 0)
return ERR_PTR(ret);
index = ret;
} else {
index = 0;
}
struct fwnode_handle *fwnode_back __free(fwnode_handle) =
fwnode_find_reference(fwnode, "io-backends", index);
if (IS_ERR(fwnode_back))
@@ -996,8 +986,7 @@ static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, con
if (ret)
return ERR_PTR(ret);
if (name)
back->idx = index;
back->idx = index;
return back;
}
@@ -1005,6 +994,24 @@ static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, con
return ERR_PTR(-EPROBE_DEFER);
}
static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *dev, const char *name,
struct fwnode_handle *fwnode)
{
unsigned int index;
int ret;
if (name) {
ret = device_property_match_string(dev, "io-backend-names", name);
if (ret < 0)
return ERR_PTR(ret);
index = ret;
} else {
index = 0;
}
return __devm_iio_backend_fwnode_get_by_index(dev, fwnode, index);
}
/**
* devm_iio_backend_get - Device managed backend device get
* @dev: Consumer device for the backend
@@ -1021,6 +1028,22 @@ struct iio_backend *devm_iio_backend_get(struct device *dev, const char *name)
}
EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get, "IIO_BACKEND");
/**
* devm_iio_backend_get_by_index - Device managed backend device get by index
* @dev: Consumer device for the backend
* @index: Index of the backend in the io-backends property
*
* Gets the backend at @index associated with @dev.
*
* RETURNS:
* A backend pointer, negative error pointer otherwise.
*/
struct iio_backend *devm_iio_backend_get_by_index(struct device *dev, unsigned int index)
{
return __devm_iio_backend_fwnode_get_by_index(dev, dev_fwnode(dev), index);
}
EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get_by_index, "IIO_BACKEND");
/**
* devm_iio_backend_fwnode_get - Device managed backend firmware node get
* @dev: Consumer device for the backend

1
include/linux/iio/backend.h
View File

@@ -261,6 +261,7 @@ int iio_backend_extend_chan_spec(struct iio_backend *back,
bool iio_backend_has_caps(struct iio_backend *back, u32 caps);
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_get_by_index(struct device *dev, unsigned int index);
struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev,
const char *name,
struct fwnode_handle *fwnode);