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From:   Pascal PAILLET-LME <p.paillet@st.com>
To:     "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "lgirdwood@gmail.com" <lgirdwood@gmail.com>,
        "broonie@kernel.org" <broonie@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "benjamin.gaignard@linaro.org" <benjamin.gaignard@linaro.org>
CC:     Pascal PAILLET-LME <p.paillet@st.com>
Subject: [PATCH 2/3] regulator: core: Link consumer with regulator driver
Thread-Topic: [PATCH 2/3] regulator: core: Link consumer with regulator driver
Thread-Index: AQHUFGwWwlUWfYmgkkeEISLF07NUuw==
Date:   Thu, 5 Jul 2018 14:25:56 +0000
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From: pascal paillet <p.paillet@st.com>

Add a device link between the consumer and the driver so that
the consumer is not suspended before the driver. The goal is to avoid
implementing suspend_late ops in regulator drivers.

Signed-off-by: pascal paillet <p.paillet@st.com>
---
 drivers/regulator/core.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 6ed568b..607ec47 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1740,6 +1740,8 @@ struct regulator *_regulator_get(struct device *dev, const char *id,
 			rdev->use_count = 0;
 	}
 
+	device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);
+
 	return regulator;
 }
 
@@ -1829,9 +1831,21 @@ static void _regulator_put(struct regulator *regulator)
 
 	debugfs_remove_recursive(regulator->debugfs);
 
-	/* remove any sysfs entries */
-	if (regulator->dev)
+	if (regulator->dev) {
+		int count = 0;
+		struct regulator *r;
+
+		list_for_each_entry(r, &rdev->consumer_list, list)
+			if (r->dev == regulator->dev)
+				count++;
+
+		if (count == 1)
+			device_link_remove(regulator->dev, &rdev->dev);
+
+		/* remove any sysfs entries */
 		sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
+	}
+
 	regulator_lock(rdev);
 	list_del(&regulator->list);
 
-- 
1.9.1