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authorOlivier Moysan <olivier.moysan@foss.st.com>2024-07-30 10:46:33 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2024-08-10 12:17:34 +0200
commitc464cc610f51f6eb5f27bf905d4c1ab1896b2725 (patch)
treef48e13ae0d9c6ae51619dc174e83274923c5cd57
parentiio: add enable and disable services to iio backend framework (diff)
downloadlinux-c464cc610f51f6eb5f27bf905d4c1ab1896b2725.tar.xz
linux-c464cc610f51f6eb5f27bf905d4c1ab1896b2725.zip
iio: add child nodes support in iio backend framework
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>
-rw-r--r--drivers/iio/industrialio-backend.c57
-rw-r--r--include/linux/iio/backend.h3
2 files changed, 44 insertions, 16 deletions
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 8a7ff783ae29..a52a6b61c8b5 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -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);
@@ -766,12 +757,46 @@ 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
* @fwnode: Firmware node of the backend device
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index b0b663163ff4..37d56914d485 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -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);