linux-kernel - [PATCH V7 01/13] of: platform: Add of_find_any_device_by

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Date:   Fri, 23 Feb 2018 15:53:40 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        robdclark@...il.com, s.hauer@...gutronix.de,
        l.stach@...gutronix.de, shawnguo@...nel.org, fabio.estevam@....com,
        nm@...com, xuwei5@...ilicon.com, robh+dt@...nel.org, olof@...om.net
Subject: [PATCH V7 01/13] of: platform: Add of_find_any_device_by_node()

This creates a new helper that returns the struct device corresponding
to a struct device_node. This currently works only for amba and platform
devices, but can be easily extended to include other bus types.

This also creates an internal of_find_amba_device_by_node() helper,
which isn't exported as of now.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/of/platform.c       | 55 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of_platform.h |  5 +++++
 2 files changed, 60 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index c00d81dfac0b..72853f9043e6 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -55,6 +55,61 @@ struct platform_device *of_find_device_by_node(struct device_node *np)
 }
 EXPORT_SYMBOL(of_find_device_by_node);
 
+#ifdef CONFIG_ARM_AMBA
+/**
+ * of_find_amba_device_by_node - Find the amba_device associated with a node
+ * @np: Pointer to device tree node
+ *
+ * Takes a reference to the embedded struct device which needs to be dropped
+ * after use.
+ *
+ * Returns amba_device pointer, or NULL if not found
+ */
+static struct amba_device *of_find_amba_device_by_node(struct device_node *np)
+{
+	struct device *dev;
+
+	dev = bus_find_device(&amba_bustype, NULL, np, of_dev_node_match);
+	return dev ? to_amba_device(dev) : NULL;
+}
+#else
+static inline struct amba_device *of_find_amba_device_by_node(struct device_node *np)
+{
+	return NULL;
+}
+#endif
+
+/**
+ * of_find_any_device_by_node - Find the struct device associated with a node
+ * @np: Pointer to device tree node
+ *
+ * Takes a reference to the embedded struct device which needs to be dropped
+ * after use.
+ *
+ * This currently supports only AMBA and platform devices.
+ *
+ * Returns struct device pointer, or NULL if not found
+ */
+struct device *of_find_any_device_by_node(struct device_node *np)
+{
+	struct device *dev = NULL;
+
+	if (of_device_is_compatible(np, "arm,primecell")) {
+		struct amba_device *adev = of_find_amba_device_by_node(np);
+
+		if (adev)
+			dev = &adev->dev;
+	} else {
+		struct platform_device *pdev = of_find_device_by_node(np);
+
+		if (pdev)
+			dev = &pdev->dev;
+	}
+
+	return dev;
+}
+EXPORT_SYMBOL(of_find_any_device_by_node);
+
 #ifdef CONFIG_OF_ADDRESS
 /*
  * The following routines scan a subtree and registers a device for
diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h
index 84a966623e78..5fb20afaf895 100644
--- a/include/linux/of_platform.h
+++ b/include/linux/of_platform.h
@@ -54,11 +54,16 @@ extern struct platform_device *of_device_alloc(struct device_node *np,
 					 struct device *parent);
 #ifdef CONFIG_OF
 extern struct platform_device *of_find_device_by_node(struct device_node *np);
+extern struct device *of_find_any_device_by_node(struct device_node *np);
 #else
 static inline struct platform_device *of_find_device_by_node(struct device_node *np)
 {
 	return NULL;
 }
+static inline struct device *of_find_any_device_by_node(struct device_node *np)
+{
+	return NULL;
+}
 #endif
 
 /* Platform devices and busses creation */
-- 
2.15.0.194.g9af6a3dea062