linux-kernel - [PATCH v3 4/6] regulator: act8945a-regulator: add shutdown function

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Message-ID: <1544543768-2066-5-git-send-email-claudiu.beznea@microchip.com>
Date:   Tue, 11 Dec 2018 15:56:50 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <robh+dt@...nel.org>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>, <mark.rutland@....com>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Claudiu.Beznea@...rochip.com>
Subject: [PATCH v3 4/6] regulator: act8945a-regulator: add shutdown function

From: Claudiu Beznea <claudiu.beznea@...rochip.com>

Implement shutdown method to make sure the PMIC will not enter the suspend
state when the system is shutdown.

This work is based on work done by Borris Brezillon on [1].

[1] https://www.spinics.net/lists/kernel/msg2942960.html

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/regulator/act8945a-regulator.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/regulator/act8945a-regulator.c b/drivers/regulator/act8945a-regulator.c
index f4d60743efb3..90572b6370c6 100644
--- a/drivers/regulator/act8945a-regulator.c
+++ b/drivers/regulator/act8945a-regulator.c
@@ -339,12 +339,23 @@ static int act8945a_suspend(struct device *pdev)
 
 SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
 
+static void act8945a_pmic_shutdown(struct platform_device *pdev)
+{
+	struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);
+
+	/*
+	 * Ask the PMIC to shutdown everything on the next PWRHLD transition.
+	 */
+	regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
+}
+
 static struct platform_driver act8945a_pmic_driver = {
 	.driver = {
 		.name = "act8945a-regulator",
 		.pm = &act8945a_pm,
 	},
 	.probe = act8945a_pmic_probe,
+	.shutdown = act8945a_pmic_shutdown,
 };
 module_platform_driver(act8945a_pmic_driver);
 
-- 
2.7.4