linux-kernel - [PATCH v14 2/7] PM / wakeup: Add device_children_wakeup

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Date:   Wed, 20 Apr 2022 00:41:05 +0530
From:   Sandeep Maheswaram <quic_c_sanm@...cinc.com>
To:     Rob Herring <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "Matthias Kaehlcke" <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>
CC:     <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_kriskura@...cinc.com>,
        <quic_vpulyala@...cinc.com>,
        Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Subject: [PATCH v14 2/7] PM / wakeup: Add device_children_wakeup_capable()

From: Matthias Kaehlcke <mka@...omium.org>

Add device_children_wakeup_capable() which checks whether the device itself
or one if its descendants is wakeup capable.

Suggested-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
 drivers/base/power/wakeup.c | 18 ++++++++++++++++++
 include/linux/pm_wakeup.h   |  7 +++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index a57d469..1900637 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -541,6 +541,24 @@ int device_set_wakeup_enable(struct device *dev, bool enable)
 }
 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
 
+static int __device_children_wakeup_capable(struct device *dev, void *dummy)
+{
+	return device_may_wakeup(dev) ||
+		device_for_each_child(dev, NULL, __device_children_wakeup_capable);
+}
+
+/**
+ * device_children_wakeup_capable - Check whether a device or one of its descendants is
+ *                                  wakeup capable.
+ * @dev: Device to handle.
+ */
+bool device_children_wakeup_capable(struct device *dev)
+{
+	return __device_children_wakeup_capable(dev, NULL);
+}
+EXPORT_SYMBOL_GPL(device_children_wakeup_capable);
+
+
 /**
  * wakeup_source_not_registered - validate the given wakeup source.
  * @ws: Wakeup source to be validated.
diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h
index 196a157..9a3005b 100644
--- a/include/linux/pm_wakeup.h
+++ b/include/linux/pm_wakeup.h
@@ -109,6 +109,7 @@ extern struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws);
 extern int device_wakeup_enable(struct device *dev);
 extern int device_wakeup_disable(struct device *dev);
 extern void device_set_wakeup_capable(struct device *dev, bool capable);
+extern bool device_children_wakeup_capable(struct device *dev);
 extern int device_init_wakeup(struct device *dev, bool val);
 extern int device_set_wakeup_enable(struct device *dev, bool enable);
 extern void __pm_stay_awake(struct wakeup_source *ws);
@@ -186,6 +187,12 @@ static inline bool device_wakeup_path(struct device *dev)
 
 static inline void device_set_wakeup_path(struct device *dev) {}
 
+static inline bool device_children_wakeup_capable(struct device *dev)
+{
+	return false;
+}
+
+
 static inline void __pm_stay_awake(struct wakeup_source *ws) {}
 
 static inline void pm_stay_awake(struct device *dev) {}
-- 
2.7.4