linux-kernel - [PATCH] device property: Add fwnode

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Message-ID: <20211115173819.22778-1-anand.ashok.dumbre@xilinx.com>
Date:   Mon, 15 Nov 2021 17:38:19 +0000
From:   Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
To:     <linux-kernel@...r.kernel.org>, <jic23@...nel.org>,
        <lars@...afoo.de>, <linux-iio@...r.kernel.org>, <git@...inx.com>,
        <michal.simek@...inx.com>, <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, <linux-acpi@...r.kernel.org>,
        <andriy.shevchenko@...ux.intel.com>,
        <heikki.krogerus@...ux.intel.com>
CC:     Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
Subject: [PATCH] device property: Add fwnode_iomap()

This patch introduces a new helper routine - fwnode_iomap(),
which allows to map the memory mapped IO for a given device node.

Signed-off-by: Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
---
 drivers/base/property.c  | 15 +++++++++++++++
 include/linux/property.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 453918eb7390..9323e9b5de02 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1021,6 +1021,21 @@ int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
 }
 EXPORT_SYMBOL(fwnode_irq_get);
 
+/**
+ * fwnode_iomap - Maps the memory mapped IO for a given fwnode
+ * @fwnode:	Pointer to the firmware node
+ * @index:	Index of the IO range
+ *
+ * Returns a pointer to the mapped memory.
+ */
+void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index) {
+	if (is_of_node(fwnode))
+		return of_iomap(to_of_node(fwnode), index);
+
+	return NULL;
+}
+EXPORT_SYMBOL(fwnode_iomap);
+
 /**
  * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
  * @fwnode: Pointer to the parent firmware node
diff --git a/include/linux/property.h b/include/linux/property.h
index 357513a977e5..9bb0b0155402 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -121,6 +121,8 @@ void fwnode_handle_put(struct fwnode_handle *fwnode);
 
 int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
 
+void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
+
 unsigned int device_get_child_node_count(struct device *dev);
 
 static inline bool device_property_read_bool(struct device *dev,
-- 
2.17.1