linux-kernel - [PATCH] mfd: sprd: Add wakeup capability for PMIC irq

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Date:   Thu,  7 May 2020 14:40:24 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     lee.jones@...aro.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com, baolin.wang7@...il.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: sprd: Add wakeup capability for PMIC irq

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@...il.com>
Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/mfd/sprd-sc27xx-spi.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
index ebdf2f1..3064a60 100644
--- a/drivers/mfd/sprd-sc27xx-spi.c
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -256,7 +256,7 @@ static int sprd_pmic_probe(struct spi_device *spi)
 	}
 
 	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);
@@ -272,9 +272,36 @@ static int sprd_pmic_probe(struct spi_device *spi)
 		return ret;
 	}
 
+	device_init_wakeup(&spi->dev, 1);
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sprd_pmic_suspend(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct sprd_pmic *ddata = spi_get_drvdata(spi);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(ddata->irq);
+
+	return 0;
+}
+
+static int sprd_pmic_resume(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	struct sprd_pmic *ddata = spi_get_drvdata(spi);
+
+	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 },
 	{},
@@ -286,6 +313,7 @@ static int sprd_pmic_probe(struct spi_device *spi)
 		.name = "sc27xx-pmic",
 		.bus = &spi_bus_type,
 		.of_match_table = sprd_pmic_match,
+		.pm = &sprd_pmic_pm_ops,
 	},
 	.probe = sprd_pmic_probe,
 };
-- 
1.9.1