linux-kernel - [PATCH 4.4 011/135] mfd: wm8994: Fix driver operation if loaded as modules

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Message-Id: <20200629155309.2495516-12-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:51:05 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Lee Jones <lee.jones@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 011/135] mfd: wm8994: Fix driver operation if loaded as modules

From: Marek Szyprowski <m.szyprowski@...sung.com>

[ Upstream commit d4f9b5428b53dd67f49ee8deed8d4366ed6b1933 ]

WM8994 chip has built-in regulators, which might be used for chip
operation. They are controlled by a separate wm8994-regulator driver,
which should be loaded before this driver calls regulator_get(), because
that driver also provides consumer-supply mapping for the them. If that
driver is not yet loaded, regulator core substitute them with dummy
regulator, what breaks chip operation, because the built-in regulators are
never enabled. Fix this by annotating this driver with MODULE_SOFTDEP()
"pre" dependency to "wm8994_regulator" module.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mfd/wm8994-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index 7eec619a6023c..3d1457189fa21 100644
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -690,3 +690,4 @@ module_i2c_driver(wm8994_i2c_driver);
 MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mark Brown <broonie@...nsource.wolfsonmicro.com>");
+MODULE_SOFTDEP("pre: wm8994_regulator");
-- 
2.25.1