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From:   Marcin Wojtas <mw@semihalf.com>
To:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        netdev@vger.kernel.org, linux-acpi@vger.kernel.org
Cc:     graeme.gregory@linaro.org, davem@davemloft.net,
        linux@armlinux.org.uk, rafael.j.wysocki@intel.com, andrew@lunn.ch,
        f.fainelli@gmail.com, antoine.tenart@free-electrons.com,
        thomas.petazzoni@free-electrons.com,
        gregory.clement@free-electrons.com, stefanc@marvell.com,
        nadavh@marvell.com, neta@marvell.com, ard.biesheuvel@linaro.org,
        mw@semihalf.com, jaz@semihalf.com, tn@semihalf.com
Subject: [net-next: PATCH v4 4/7] device property: Allow iterating over available child fwnodes
Date:   Thu, 18 Jan 2018 13:31:41 +0100
Message-Id: <1516278704-17141-5-git-send-email-mw@semihalf.com>
In-Reply-To: <1516278704-17141-1-git-send-email-mw@semihalf.com>
References: <1516278704-17141-1-git-send-email-mw@semihalf.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Implement a new helper function fwnode_get_next_available_child_node(),
which enables obtaining next enabled child fwnode, which
works on a similar basis to OF's of_get_next_available_child().

This commit also introduces a macro, thanks to which it is
possible to iterate over the available fwnodes, using the
new function described above.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
---
 drivers/base/property.c  | 26 ++++++++++++++++++++
 include/linux/property.h |  6 +++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 1d6c9d9..613ba82 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -998,6 +998,32 @@ fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
 EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
 
 /**
+ * fwnode_get_next_available_child_node - Return the next
+ * available child node handle for a node
+ * @fwnode: Firmware node to find the next child node for.
+ * @child: Handle to one of the node's child nodes or a %NULL handle.
+ */
+struct fwnode_handle *
+fwnode_get_next_available_child_node(const struct fwnode_handle *fwnode,
+				     struct fwnode_handle *child)
+{
+	struct fwnode_handle *next_child = child;
+
+	if (!fwnode)
+		return NULL;
+
+	do {
+		next_child = fwnode_get_next_child_node(fwnode, next_child);
+
+		if (!next_child || fwnode_device_is_available(next_child))
+			break;
+	} while (next_child);
+
+	return next_child;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_next_available_child_node);
+
+/**
  * device_get_next_child_node - Return the next child node handle for a device
  * @dev: Device to find the next child node for.
  * @child: Handle to one of the device's child nodes or a null handle.
diff --git a/include/linux/property.h b/include/linux/property.h
index e05889f..5b0563a 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -83,11 +83,17 @@ struct fwnode_handle *fwnode_get_next_parent(
 	struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_get_next_child_node(
 	const struct fwnode_handle *fwnode, struct fwnode_handle *child);
+struct fwnode_handle *fwnode_get_next_available_child_node(
+	const struct fwnode_handle *fwnode, struct fwnode_handle *child);
 
 #define fwnode_for_each_child_node(fwnode, child)			\
 	for (child = fwnode_get_next_child_node(fwnode, NULL); child;	\
 	     child = fwnode_get_next_child_node(fwnode, child))
 
+#define fwnode_for_each_available_child_node(fwnode, child)		       \
+	for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
+	     child = fwnode_get_next_available_child_node(fwnode, child))
+
 struct fwnode_handle *device_get_next_child_node(
 	struct device *dev, struct fwnode_handle *child);
 
-- 
2.7.4