[PATCH v3 2/2] mtd: m25p80: Added pm ops support

[Kamal Dasu <kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Added power management ops for resume to be able to resan spi-nor
device and set it to right transfer modes in its probed state after
poweron. Some SoC implementations might  power down the spi-nor flash
and loose its initial settings on suspend. A resume should retore the
part to its probed state.

Signed-off-by: Kamal Dasu <kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/mtd/devices/m25p80.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index c4df3b1..be94fba 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -324,10 +324,26 @@ static int m25p_remove(struct spi_device *spi)
 };
 MODULE_DEVICE_TABLE(of, m25p_of_table);
 
+#ifdef CONFIG_PM_SLEEP
+static int m25p_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int m25p_resume(struct device *dev)
+{
+	struct m25p *flash = dev_get_drvdata(dev);
+
+	return spi_nor_init(&flash->spi_nor);
+}
+#endif
+static SIMPLE_DEV_PM_OPS(m25p_pm_ops, m25p_suspend, m25p_resume);
+
 static struct spi_driver m25p80_driver = {
 	.driver = {
 		.name	= "m25p80",
 		.of_match_table = m25p_of_table,
+		.pm     = &m25p_pm_ops,
 	},
 	.id_table	= m25p_ids,
 	.probe	= m25p_probe,
-- 
1.9.1

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