linux-kernel - [PATCH v2] regulator: mcp16502: add support for suspend

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Date:   Fri, 14 Dec 2018 08:09:31 +0000
From:   <Andrei.Stefanescu@...rochip.com>
To:     <broonie@...nel.org>, <lgirdwood@...il.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Cristian.Birsan@...rochip.com>,
        <Nicolas.Ferre@...rochip.com>, <Andrei.Stefanescu@...rochip.com>
Subject: [PATCH v2] regulator: mcp16502: add support for suspend

This patch adds support for entering/resuming suspend states.
It does this by setting the LPM pin of the PMIC.

When suspending the PMIC will enter the Low-power mode
when the LPM pin will be set to high. If the suspend target state
is suspend-to-mem, the PMIC will transition to Hibernate mode,
otherwise, if it is standby, it will remain in Low-power mode.

Signed-off-by: Andrei Stefanescu <andrei.stefanescu@...rochip.com>
---
 drivers/regulator/mcp16502.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/regulator/mcp16502.c b/drivers/regulator/mcp16502.c
index 7cbc96f..25d7b43 100644
--- a/drivers/regulator/mcp16502.c
+++ b/drivers/regulator/mcp16502.c
@@ -497,6 +497,37 @@ static int mcp16502_probe(struct i2c_client *client,
 	return 0;
 }
 
+#ifdef CONFIG_SUSPEND
+static int mcp16502_suspend_noirq(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct mcp16502 *mcp = i2c_get_clientdata(client);
+
+	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);
+
+	return 0;
+}
+
+static int mcp16502_resume_noirq(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct mcp16502 *mcp = i2c_get_clientdata(client);
+
+	mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
+
+	return 0;
+}
+#else /* !CONFIG_SUSPEND */
+#define mcp16502_suspend NULL
+#define mcp16502_resume NULL
+#endif /* !CONFIG_SUSPEND */
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops mcp16502_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
+				     mcp16502_resume_noirq)
+};
+#endif
 static const struct i2c_device_id mcp16502_i2c_id[] = {
 	{ "mcp16502", 0 },
 	{ }
@@ -508,6 +539,9 @@ static struct i2c_driver mcp16502_drv = {
 	.driver		= {
 		.name	= "mcp16502-regulator",
 		.of_match_table	= of_match_ptr(mcp16502_ids),
+#ifdef CONFIG_PM
+		.pm = &mcp16502_pm_ops,
+#endif
 	},
 	.id_table	= mcp16502_i2c_id,
 };
-- 
2.7.4