From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
look up master associated with of_node
Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
---
drivers/of/of_spi.c | 28 ++++++++++++++++++++++++++++
drivers/spi/spi.c | 4 ++--
include/linux/of_spi.h | 1 +
include/linux/spi/spi.h | 2 ++
4 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/drivers/of/of_spi.c b/drivers/of/of_spi.c
index 6dbc074..f3dee01 100644
--- a/drivers/of/of_spi.c
+++ b/drivers/of/of_spi.c
@@ -97,3 +97,31 @@ void of_register_spi_devices(struct spi_master *master)
}
}
EXPORT_SYMBOL(of_register_spi_devices);
+
+static int __spi_master_of_match(struct device *dev, void *data)
+{
+ struct device_node *of_node = data;
+ return dev->of_node == of_node;
+}
+
+/**
+ * spi_of_node_to_master - look up master associated with of_node
+ * @of_node: pointer to the device tree node.
+ * Context: can sleep
+ *
+ * Returns a pointer to the relevant spi_master, or NULL if there is
+ * no such master registered.
+ */
+struct spi_master *spi_of_node_to_master(struct device_node *of_node)
+{
+ struct device *dev;
+ struct spi_master *master = NULL;
+
+ dev = class_find_device(&spi_master_class, NULL, of_node,
+ __spi_master_of_match);
+ if (dev)
+ master = container_of(dev, struct spi_master, dev);
+
+ return master;
+}
+EXPORT_SYMBOL_GPL(spi_of_node_to_master);
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b2ccdea..6f63a8e 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -515,12 +515,12 @@ static void spi_master_release(struct device *dev)
kfree(master);
}
-static struct class spi_master_class = {
+struct class spi_master_class = {
.name = "spi_master",
.owner = THIS_MODULE,
.dev_release = spi_master_release,
};
-
+EXPORT_SYMBOL_GPL(spi_master_class);
/**
* spi_alloc_master - allocate SPI master controller
diff --git a/include/linux/of_spi.h b/include/linux/of_spi.h
index 9e3e70f..e1bafd2 100644
--- a/include/linux/of_spi.h
+++ b/include/linux/of_spi.h
@@ -13,6 +13,7 @@
#if defined(CONFIG_OF_SPI) || defined(CONFIG_OF_SPI_MODULE)
extern void of_register_spi_devices(struct spi_master *master);
+extern struct spi_master *spi_of_node_to_master(struct device_node *of_node);
#else
static inline void of_register_spi_devices(struct spi_master *master)
{
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 176fce9..62e566e 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -805,4 +805,6 @@ spi_unregister_device(struct spi_device *spi)
extern const struct spi_device_id *
spi_get_device_id(const struct spi_device *sdev);
+extern struct class spi_master_class;
+
#endif /* __LINUX_SPI_H */
--
1.7.0.4
--
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