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Date: Tue, 19 Jun 2018 23:27:42 +0200 From: Daniel Mack <daniel@...que.org> To: zbr@...emap.net, robh+dt@...nel.org, mark.rutland@....com, szabolcs.gyurko@....hu Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Daniel Mack <daniel@...que.org> Subject: [PATCH RFC 2/4] w1: core: match sub-nodes of bus masters in devicetree 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@...que.org> --- 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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