linux-kernel - [PATCH v4 16/17] FDT: Add a helper to get specified name subnode

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Date:	Fri, 5 Feb 2016 11:05:51 +0800
From:	Shannon Zhao <zhaoshenglong@...wei.com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<ard.biesheuvel@...aro.org>, <stefano.stabellini@...rix.com>,
	<david.vrabel@...rix.com>
CC:	<catalin.marinas@....com>, <will.deacon@....com>,
	<mark.rutland@....com>, <julien.grall@...rix.com>,
	<xen-devel@...ts.xen.org>, <devicetree@...r.kernel.org>,
	<linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<ian.campbell@...rix.com>, <shannon.zhao@...aro.org>,
	<peter.huangpeng@...wei.com>, Rob Herring <robh@...nel.org>
Subject: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode

From: Shannon Zhao <shannon.zhao@...aro.org>

Sometimes it needs to check if there is a node in FDT by full path.
Introduce this helper to get the specified name subnode if it exists.

Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
---
CC: Rob Herring <robh@...nel.org>
---
 drivers/of/fdt.c       | 25 +++++++++++++++++++++++++
 include/linux/of_fdt.h |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 655f79d..eacb188 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -645,6 +645,31 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
 }
 
 /**
+ * of_get_flat_dt_subnode_by_name - get subnode of specified node by name
+ *
+ * @node: the parent node
+ * @uname: the name of subnode
+ * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
+ */
+
+int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
+{
+	const void *blob = initial_boot_params;
+	int offset;
+	const char *pathp;
+
+	for (offset = fdt_first_subnode(blob, node);
+	     offset >= 0;
+	     offset = fdt_next_subnode(blob, offset)) {
+		pathp = fdt_get_name(blob, offset, NULL);
+		if (strcmp(pathp, uname) == 0)
+			return offset;
+	}
+
+	return -FDT_ERR_NOTFOUND;
+}
+
+/**
  * of_get_flat_dt_root - find the root node in the flat blob
  */
 unsigned long __init of_get_flat_dt_root(void)
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index df9ef38..fc28162 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -52,6 +52,8 @@ extern char __dtb_end[];
 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
 				     int depth, void *data),
 			   void *data);
+extern int of_get_flat_dt_subnode_by_name(unsigned long node,
+					  const char *uname);
 extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
 				       int *size);
 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
-- 
2.0.4