From: Kamal Dasu <kdasu.kdev@gmail.com>
To: linux-spi@vger.kernel.org, cyrille.pitchen@atmel.com,
marex@denx.de, broonie@kernel.org
Cc: bcm-kernel-feedback-list@broadcom.com, f.fainelli@gmail.com,
linux-mtd@lists.infradead.org, Kamal Dasu <kdasu.kdev@gmail.com>
Subject: [PATCH v5 2/2] mtd: m25p80: Added pm ops support
Date: Wed, 22 Feb 2017 14:19:33 -0500 [thread overview]
Message-ID: <1487791173-22159-3-git-send-email-kdasu.kdev@gmail.com> (raw)
In-Reply-To: <1487791173-22159-1-git-send-email-kdasu.kdev@gmail.com>
Added power management ops for resume to be able to reinitialize
spi-nor device and set it to right transfer mode in its pre-suspend
state. Some SoC implementations might power down the spi-nor flash
and loose its initial settings on suspend. A resume should restore
part settings to its original pre-suspend state.
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
---
drivers/mtd/devices/m25p80.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index c4df3b1..3ab30b2 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -324,10 +324,21 @@ static int m25p_remove(struct spi_device *spi)
};
MODULE_DEVICE_TABLE(of, m25p_of_table);
+#ifdef CONFIG_PM_SLEEP
+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, NULL, 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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next prev parent reply other threads:[~2017-02-22 19:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-22 19:19 [PATCH v5 0/2] Added support for spi-nor device pm in m25p80 Kamal Dasu
2017-02-22 19:19 ` [PATCH v5 1/2] mtd: spi-nor: Added spi-nor init function Kamal Dasu
2017-02-22 20:56 ` Cyrille Pitchen
2017-02-23 22:06 ` Kamal Dasu
2017-02-22 19:19 ` Kamal Dasu [this message]
2017-02-22 20:38 ` [PATCH v5 2/2] mtd: m25p80: Added pm ops support Cyrille Pitchen
2017-02-22 21:26 ` Kamal Dasu
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