diff mbox series

of: property: fw_devlink: Fixup behaviour when 'node_not_dev' is set

Message ID 20210902090221.820254-1-ulf.hansson@linaro.org
State Accepted
Commit 3cd6bab2f81da960322227e4758c675b95c2895c
Headers show
Series of: property: fw_devlink: Fixup behaviour when 'node_not_dev' is set | expand

Commit Message

Ulf Hansson Sept. 2, 2021, 9:02 a.m. UTC
In the struct supplier_bindings the member 'node_not_dev' is described as
"The consumer node containing the property is never a device.", but that is
inconsistent with the behaviour of the code in of_link_property(), as it
calls of_get_compat_node() that starts parsing for a compatible property
from the node it gets passed to it. The proper behaviour is to start at the
node's parent, so let's do that.

While at it, let's take the opportunity to update the description of the
'node_not_dev' flag, as to clarify its purpose.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
 drivers/of/property.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

-- 
2.25.1

Comments

Saravana Kannan Sept. 2, 2021, 5:09 p.m. UTC | #1
On Thu, Sep 2, 2021 at 2:02 AM Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> In the struct supplier_bindings the member 'node_not_dev' is described as
> "The consumer node containing the property is never a device.", but that is
> inconsistent with the behaviour of the code in of_link_property(), as it
> calls of_get_compat_node() that starts parsing for a compatible property
> from the node it gets passed to it. The proper behaviour is to start at the
> node's parent, so let's do that.
>
> While at it, let's take the opportunity to update the description of the
> 'node_not_dev' flag, as to clarify its purpose.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Reviewed-by: Saravana Kannan <saravanak@google.com>

-Saravana

> ---
>  drivers/of/property.c | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 6c028632f425..a94d007be416 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1075,6 +1075,17 @@ static struct device_node *of_get_compat_node(struct device_node *np)
>         return np;
>  }
>
> +static struct device_node *of_get_compat_node_parent(struct device_node *np)
> +{
> +       struct device_node *parent, *node;
> +
> +       parent = of_get_parent(np);
> +       node = of_get_compat_node(parent);
> +       of_node_put(parent);
> +
> +       return node;
> +}
> +
>  /**
>   * of_link_to_phandle - Add fwnode link to supplier from supplier phandle
>   * @con_np: consumer device tree node
> @@ -1249,7 +1260,9 @@ static struct device_node *parse_##fname(struct device_node *np,       \
>   * @parse_prop.index: For properties holding a list of phandles, this is the
>   *                   index into the list
>   * @optional: Describes whether a supplier is mandatory or not
> - * @node_not_dev: The consumer node containing the property is never a device.
> + * @node_not_dev: The consumer node containing the property is never converted
> + *               to a struct device. Instead, parse ancestor nodes for the
> + *               compatible property to find a node corresponding to a device.
>   *
>   * Returns:
>   * parse_prop() return values are
> @@ -1416,7 +1429,7 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
>                         struct device_node *con_dev_np;
>
>                         con_dev_np = s->node_not_dev
> -                                       ? of_get_compat_node(con_np)
> +                                       ? of_get_compat_node_parent(con_np)
>                                         : of_node_get(con_np);
>                         matched = true;
>                         i++;
> --
> 2.25.1
>
diff mbox series

Patch

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 6c028632f425..a94d007be416 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1075,6 +1075,17 @@  static struct device_node *of_get_compat_node(struct device_node *np)
 	return np;
 }
 
+static struct device_node *of_get_compat_node_parent(struct device_node *np)
+{
+	struct device_node *parent, *node;
+
+	parent = of_get_parent(np);
+	node = of_get_compat_node(parent);
+	of_node_put(parent);
+
+	return node;
+}
+
 /**
  * of_link_to_phandle - Add fwnode link to supplier from supplier phandle
  * @con_np: consumer device tree node
@@ -1249,7 +1260,9 @@  static struct device_node *parse_##fname(struct device_node *np,	     \
  * @parse_prop.index: For properties holding a list of phandles, this is the
  *		      index into the list
  * @optional: Describes whether a supplier is mandatory or not
- * @node_not_dev: The consumer node containing the property is never a device.
+ * @node_not_dev: The consumer node containing the property is never converted
+ *		  to a struct device. Instead, parse ancestor nodes for the
+ *		  compatible property to find a node corresponding to a device.
  *
  * Returns:
  * parse_prop() return values are
@@ -1416,7 +1429,7 @@  static int of_link_property(struct device_node *con_np, const char *prop_name)
 			struct device_node *con_dev_np;
 
 			con_dev_np = s->node_not_dev
-					? of_get_compat_node(con_np)
+					? of_get_compat_node_parent(con_np)
 					: of_node_get(con_np);
 			matched = true;
 			i++;