[PATCH v3] mfd: sprd: Add wakeup capability for PMIC irq

[Chunyan Zhang]

From: Baolin Wang <baolin.wang7@xxxxxxxxx>

When changing to use suspend-to-idle to save power, the PMIC irq can not
wakeup the system due to lack of wakeup capability, which will cause
the sub-irqs (such as power key) of the PMIC can not wake up the system.
Thus we can add the wakeup capability for PMIC irq to solve this issue,
as well as removing the IRQF_NO_SUSPEND flag to allow PMIC irq to be
a wakeup source.

Reported-by: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
Signed-off-by: Baolin Wang <baolin.wang7@xxxxxxxxx>
Tested-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
---
Changes from v2:
* rebased on v5.9-rc1;

Changes from v1:
* addressed comments from Lee;
* added tested-by from Chunyan.
---
 drivers/mfd/sprd-sc27xx-spi.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
index f8a8b918c60d..6b7956604a0f 100644
--- a/drivers/mfd/sprd-sc27xx-spi.c
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -189,7 +189,7 @@ static int sprd_pmic_probe(struct spi_device *spi)
 		ddata->irqs[i].mask = BIT(i);
 
 	ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
-				       IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
+				       IRQF_ONESHOT, 0,
 				       &ddata->irq_chip, &ddata->irq_data);
 	if (ret) {
 		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
@@ -202,9 +202,34 @@ static int sprd_pmic_probe(struct spi_device *spi)
 		return ret;
 	}
 
+	device_init_wakeup(&spi->dev, true);
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sprd_pmic_suspend(struct device *dev)
+{
+	struct sprd_pmic *ddata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(ddata->irq);
+
+	return 0;
+}
+
+static int sprd_pmic_resume(struct device *dev)
+{
+	struct sprd_pmic *ddata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(ddata->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
+
 static const struct of_device_id sprd_pmic_match[] = {
 	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
 	{},
@@ -215,6 +240,7 @@ static struct spi_driver sprd_pmic_driver = {
 	.driver = {
 		.name = "sc27xx-pmic",
 		.of_match_table = sprd_pmic_match,
+		.pm = &sprd_pmic_pm_ops,
 	},
 	.probe = sprd_pmic_probe,
 };
-- 
2.20.1