dm: core: support reading a single indexed u32 value
The patch adds helper functions to allow reading a single indexed u32
value from a device-tree property containing multiple u32 values, that
is an array of integers.
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/of_access.c b/drivers/core/of_access.c
index 29e705e..8b2ce7a 100644
--- a/drivers/core/of_access.c
+++ b/drivers/core/of_access.c
@@ -485,6 +485,28 @@
return 0;
}
+int of_read_u32_index(const struct device_node *np, const char *propname,
+ int index, u32 *outp)
+{
+ const __be32 *val;
+
+ debug("%s: %s: ", __func__, propname);
+ if (!np)
+ return -EINVAL;
+
+ val = of_find_property_value_of_size(np, propname,
+ sizeof(*outp) * (index + 1));
+ if (IS_ERR(val)) {
+ debug("(not found)\n");
+ return PTR_ERR(val);
+ }
+
+ *outp = be32_to_cpup(val + index);
+ debug("%#x (%d)\n", *outp, *outp);
+
+ return 0;
+}
+
int of_read_u64(const struct device_node *np, const char *propname, u64 *outp)
{
const __be64 *val;
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 96a5dd2..5bc3b02 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -48,6 +48,46 @@
return def;
}
+int ofnode_read_u32_index(ofnode node, const char *propname, int index,
+ u32 *outp)
+{
+ const fdt32_t *cell;
+ int len;
+
+ assert(ofnode_valid(node));
+ debug("%s: %s: ", __func__, propname);
+
+ if (ofnode_is_np(node))
+ return of_read_u32_index(ofnode_to_np(node), propname, index,
+ outp);
+
+ cell = fdt_getprop(gd->fdt_blob, ofnode_to_offset(node), propname,
+ &len);
+ if (!cell) {
+ debug("(not found)\n");
+ return -EINVAL;
+ }
+
+ if (len < (sizeof(int) * (index + 1))) {
+ debug("(not large enough)\n");
+ return -EOVERFLOW;
+ }
+
+ *outp = fdt32_to_cpu(cell[index]);
+ debug("%#x (%d)\n", *outp, *outp);
+
+ return 0;
+}
+
+u32 ofnode_read_u32_index_default(ofnode node, const char *propname, int index,
+ u32 def)
+{
+ assert(ofnode_valid(node));
+ ofnode_read_u32_index(node, propname, index, &def);
+
+ return def;
+}
+
int ofnode_read_s32_default(ofnode node, const char *propname, s32 def)
{
assert(ofnode_valid(node));
diff --git a/drivers/core/read.c b/drivers/core/read.c
index 1f999b1..ce78f09 100644
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -22,6 +22,19 @@
return ofnode_read_u32_default(dev_ofnode(dev), propname, def);
}
+int dev_read_u32_index(struct udevice *dev, const char *propname, int index,
+ u32 *outp)
+{
+ return ofnode_read_u32_index(dev_ofnode(dev), propname, index, outp);
+}
+
+u32 dev_read_u32_index_default(struct udevice *dev, const char *propname,
+ int index, u32 def)
+{
+ return ofnode_read_u32_index_default(dev_ofnode(dev), propname, index,
+ def);
+}
+
int dev_read_s32(const struct udevice *dev, const char *propname, s32 *outp)
{
return ofnode_read_u32(dev_ofnode(dev), propname, (u32 *)outp);