dm: core: Add a function to read into a unsigned int

The current dev_read...() functions use s32 and u32 which are convenient
for device tree but not so useful for normal code, which often wants to
use normal integers for values.

Add a helper which supports returning an unsigned int. Also add signed
versions of the unsigned readers.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/dm/read.h b/include/dm/read.h
index efcbee15eca..389e30e7fb4 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -65,6 +65,38 @@ int dev_read_u32(struct udevice *dev, const char *propname, u32 *outp);
 int dev_read_u32_default(struct udevice *dev, const char *propname, int def);
 
 /**
+ * dev_read_s32() - read a signed 32-bit integer from a device's DT property
+ *
+ * @dev:	device to read DT property from
+ * @propname:	name of the property to read from
+ * @outp:	place to put value (if found)
+ * @return 0 if OK, -ve on error
+ */
+int dev_read_s32(struct udevice *dev, const char *propname, s32 *outp);
+
+/**
+ * dev_read_s32_default() - read a signed 32-bit int from a device's DT property
+ *
+ * @dev:	device to read DT property from
+ * @propname:	name of the property to read from
+ * @def:	default value to return if the property has no value
+ * @return property value, or @def if not found
+ */
+int dev_read_s32_default(struct udevice *dev, const char *propname, int def);
+
+/**
+ * dev_read_u32u() - read a 32-bit integer from a device's DT property
+ *
+ * This version uses a standard uint type.
+ *
+ * @dev:	device to read DT property from
+ * @propname:	name of the property to read from
+ * @outp:	place to put value (if found)
+ * @return 0 if OK, -ve on error
+ */
+int dev_read_u32u(struct udevice *dev, const char *propname, uint *outp);
+
+/**
  * dev_read_string() - Read a string from a device's DT property
  *
  * @dev:	device to read DT property from
@@ -492,6 +524,32 @@ static inline int dev_read_u32_default(struct udevice *dev,
 	return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
 }
 
+static inline int dev_read_s32(struct udevice *dev,
+			       const char *propname, s32 *outp)
+{
+	return ofnode_read_s32(dev_ofnode(dev), propname, outp);
+}
+
+static inline int dev_read_s32_default(struct udevice *dev,
+				       const char *propname, int def)
+{
+	return ofnode_read_s32_default(dev_ofnode(dev), propname, def);
+}
+
+static inline int dev_read_u32u(struct udevice *dev,
+				const char *propname, uint *outp)
+{
+	u32 val;
+	int ret;
+
+	ret = ofnode_read_u32(dev_ofnode(dev), propname, &val);
+	if (ret)
+		return ret;
+	*outp = val;
+
+	return 0;
+}
+
 static inline const char *dev_read_string(struct udevice *dev,
 					  const char *propname)
 {