regulator: act8945a-regulator: add shutdown function

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@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/act8945a-regulator.c b/drivers/regulator/act8945a-regulator.c
index f4d60743efb31f1c9c2ade194dc7b3e316769b72..90572b6370c696be40ee80fa8abf7db67ad40aa6 100644 (file)
--- 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);