linux-kernel - [RFC v3 PATCH 1/5] of: Add standard property for poweroff capability

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Date:	Tue, 14 Oct 2014 06:31:09 +0000
From:	Romain Perier <romain.perier@...il.com>
To:	devicetree@...r.kernel.org
Cc:	broonie@...nel.org, lgirdwood@...il.com,
	linux-kernel@...r.kernel.org, heiko@...ech.de,
	grant.likely@...aro.org, robh@...nel.org, mark.rutland@....com
Subject: [RFC v3 PATCH 1/5] of: Add standard property for poweroff capability

Several drivers create their own devicetree property when they register
poweroff capabilities. This is for example the case for mfd, regulator
or power drivers which define "vendor,system-power-controller" property.
This patch adds support for a standard property "poweroff-source"
which marks the device as able to shutdown the system.

Signed-off-by: Romain Perier <romain.perier@...il.com>
---
 include/linux/of.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index 6545e7a..27b3ba1 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -866,4 +866,15 @@ static inline int of_changeset_update_property(struct of_changeset *ocs,
 /* CONFIG_OF_RESOLVE api */
 extern int of_resolve_phandles(struct device_node *tree);
 
+/**
+ * of_system_has_poweroff_source - Tells if poweroff-source is found for device_node
+ * @np: Pointer to the given device_node
+ *
+ * return true if present false otherwise
+ */
+static inline bool of_system_has_poweroff_source(const struct device_node *np)
+{
+	return of_property_read_bool(np, "poweroff-source");
+}
+
 #endif /* _LINUX_OF_H */
-- 
1.9.1

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