Once a new slave device is detected, match it against all sub-nodes of the
master bus controller. If a match is found, set the slave device's of_node
pointer.
This alone can already be used by slave device implementations to obtain
more properties from devicetree.
Another use-case is introduced in the next patch.
Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx>
---
drivers/w1/w1.c | 3 +++
include/linux/w1.h | 2 ++
2 files changed, 5 insertions(+)
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 80a778b02f28..dc73d8c08438 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -26,6 +26,7 @@
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/hwmon.h>
+#include <linux/of.h>
#include <linux/atomic.h>
@@ -686,6 +687,8 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
sl->dev.bus = &w1_bus_type;
sl->dev.release = &w1_slave_release;
sl->dev.groups = w1_slave_groups;
+ sl->dev.of_node = of_find_matching_node(sl->master->dev.of_node,
+ sl->family->of_match_table);
dev_set_name(&sl->dev, "%02x-%012llx",
(unsigned int) sl->reg_num.family,
diff --git a/include/linux/w1.h b/include/linux/w1.h
index 694101f744c7..3111585c371f 100644
--- a/include/linux/w1.h
+++ b/include/linux/w1.h
@@ -274,6 +274,8 @@ struct w1_family {
struct w1_family_ops *fops;
+ const struct of_device_id *of_match_table;
+
atomic_t refcnt;
};
--
2.17.1
--
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