linux-kernel - [PATCH v2 1/4] PM: device: Introduce platform_resources

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Message-Id: <20250414-apr_14_for_sending-v2-1-70c5af2af96c@samsung.com>
Date: Mon, 14 Apr 2025 20:52:55 +0200
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>,  Danilo Krummrich
	<dakr@...nel.org>, Pavel Machek <pavel@...nel.org>,  Drew Fustini
	<drew@...7.com>, Guo Ren <guoren@...nel.org>,  Fu Wei <wefu@...hat.com>, Rob
	Herring <robh@...nel.org>,  Krzysztof Kozlowski <krzk+dt@...nel.org>,  Conor
	Dooley <conor+dt@...nel.org>,  Michal Wilczynski <m.wilczynski@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,  Philipp Zabel
	<p.zabel@...gutronix.de>,  Frank Binns <frank.binns@...tec.com>, Matt Coster
	<matt.coster@...tec.com>,  Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>,  Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,  David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,  m.szyprowski@...sung.com
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 1/4] PM: device: Introduce platform_resources_managed
 flag

Introduce a new dev_pm_info flag - platform_resources_managed, to
indicate whether platform PM resources such as clocks or resets are
managed externally (e.g. by a generic power domain driver) instead of
directly by the consumer device driver.

This flag enables device drivers to cooperate with SoC-specific PM
domains by conditionally skipping management of clocks and resets when
the platform owns them.

This idea was discussed on the mailing list [1].

[1] - https://lore.kernel.org/all/CAPDyKFq=BF5f2i_Sr1cmVqtVAMgr=0FqsksL7RHZLKn++y0uwg@mail.gmail.com/

Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
---
 include/linux/device.h | 11 +++++++++++
 include/linux/pm.h     |  1 +
 2 files changed, 12 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 79e49fe494b7c4c70d902886db63c4cfe5b4de4f..3e7a36dd874cfb6b98e2451c7a876989aa9f1913 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -881,6 +881,17 @@ static inline bool device_async_suspend_enabled(struct device *dev)
 	return !!dev->power.async_suspend;
 }
 
+static inline bool device_platform_resources_pm_managed(struct device *dev)
+{
+	return dev->power.platform_resources_managed;
+}
+
+static inline void device_platform_resources_set_pm_managed(struct device *dev,
+							    bool val)
+{
+	dev->power.platform_resources_managed = val;
+}
+
 static inline bool device_pm_not_required(struct device *dev)
 {
 	return dev->power.no_pm;
diff --git a/include/linux/pm.h b/include/linux/pm.h
index f0bd8fbae4f2c09c63d780bb2528693acf2d2da1..cd6cb59686e4a5e9eaa2701d1e44af2abbfd88d1 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -670,6 +670,7 @@ struct dev_pm_info {
 	bool			no_pm:1;
 	bool			early_init:1;	/* Owned by the PM core */
 	bool			direct_complete:1;	/* Owned by the PM core */
+	bool			platform_resources_managed:1;
 	u32			driver_flags;
 	spinlock_t		lock;
 #ifdef CONFIG_PM_SLEEP

-- 
2.34.1