linux-kernel - [PATCH V4 3/4] regulator: da9121: Prevent current limit change when enabled

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Date:   Mon, 29 Nov 2021 22:10:12 +0000
From:   Adam Ward <Adam.Ward.opensource@...semi.com>
To:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Support Opensource <support.opensource@...semi.com>
Subject: [PATCH V4 3/4] regulator: da9121: Prevent current limit change when
 enabled

Prevent changing current limit when enabled as a precaution against
possibile instability due to tight integration with switching cycle

Signed-off-by: Adam Ward <Adam.Ward.opensource@...semi.com>
---
 drivers/regulator/da9121-regulator.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index a5a83b772a85..86149170bf6c 100644
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -253,6 +253,11 @@ static int da9121_set_current_limit(struct regulator_dev *rdev,
 		goto error;
 	}
 
+	if (rdev->desc->ops->is_enabled(rdev)) {
+		ret = -EBUSY;
+		goto error;
+	}
+
 	ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
 	if (ret < 0)
 		goto error;
-- 
2.25.1