From 33ee09cd59ce154b64f9df942dfa5456db90d5f9 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Thu, 13 Jun 2019 19:59:51 +0300
Subject: [PATCH] device property: Add helpers to count items in an array
The usual pattern to allocate the necessary space for an array of properties is
to count them first by calling:
count = device_property_read_uXX_array(dev, propname, NULL, 0);
if (count < 0)
return count;
Introduce helpers device_property_count_uXX() to count items by supplying hard
coded last two parameters to device_property_readXX_array().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
include/linux/property.h | 44 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/include/linux/property.h b/include/linux/property.h
index 088d4db7e9490..dbacf17fff2e8 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -148,6 +148,26 @@ static inline int device_property_read_u64(struct device *dev,
return device_property_read_u64_array(dev, propname, val, 1);
}
+static inline int device_property_count_u8(struct device *dev, const char *propname)
+{
+ return device_property_read_u8_array(dev, propname, NULL, 0);
+}
+
+static inline int device_property_count_u16(struct device *dev, const char *propname)
+{
+ return device_property_read_u16_array(dev, propname, NULL, 0);
+}
+
+static inline int device_property_count_u32(struct device *dev, const char *propname)
+{
+ return device_property_read_u32_array(dev, propname, NULL, 0);
+}
+
+static inline int device_property_count_u64(struct device *dev, const char *propname)
+{
+ return device_property_read_u64_array(dev, propname, NULL, 0);
+}
+
static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
const char *propname)
{
@@ -178,6 +198,30 @@ static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
return fwnode_property_read_u64_array(fwnode, propname, val, 1);
}
+static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
+ const char *propname)
+{
+ return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
+}
+
+static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
+ const char *propname)
+{
+ return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
+}
+
+static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
+ const char *propname)
+{
+ return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
+}
+
+static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
+ const char *propname)
+{
+ return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
+}
+
/**
* struct property_entry - "Built-in" device property representation.
* @name: Name of the property.
--
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