| Message ID | 1486763369-31969-3-git-send-email-kdasu.kdev@gmail.com |
|---|---|
| State | Superseded |
| Delegated to: | Cyrille Pitchen |
| Headers | show |
On 02/10/2017 10:49 PM, Kamal Dasu wrote: > 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@gmail.com> > --- > 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; Can't you omit this function ? > +} > + > +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, >
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,
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@gmail.com> --- drivers/mtd/devices/m25p80.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)