linux-kernel - [PATCH v3 1/9] of: add of_property_read_string_array

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Date:   Fri, 25 Mar 2022 12:31:40 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Len Brown <lenb@...nel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        Clément Léger <clement.leger@...tlin.com>
Subject: [PATCH v3 1/9] of: add of_property_read_string_array_index()

Add of_property_read_string_array_index() which allows to read a string
array starting at a specific index.

Signed-off-by: Clément Léger <clement.leger@...tlin.com>
---
 include/linux/of.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index 2dc77430a91a..93f04c530bd1 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1115,6 +1115,28 @@ static inline int of_property_read_string_array(const struct device_node *np,
 	return of_property_read_string_helper(np, propname, out_strs, sz, 0);
 }
 
+/**
+ * of_property_read_string_array_index() - Read an array of strings from a
+ * multiple strings property starting at a specified index
+ * @np:		device node from which the property value is to be read.
+ * @propname:	name of the property to be searched.
+ * @out_strs:	output array of string pointers.
+ * @sz:		number of array elements to read.
+ * @index:	index to start reading from
+ *
+ * Search for a property in a device tree node and retrieve a list of
+ * terminated string values (pointer to data, not a copy) in that property
+ * starting at specified index.
+ *
+ * Return: If @out_strs is NULL, the number of strings in the property is returned.
+ */
+static inline int of_property_read_string_array_index(const struct device_node *np,
+						      const char *propname,
+						      const char **out_strs,
+						      size_t sz, int index)
+{
+	return of_property_read_string_helper(np, propname, out_strs, sz, index);
+}
 /**
  * of_property_count_strings() - Find and return the number of strings from a
  * multiple strings property.
-- 
2.34.1