From: Kamal Dasu <kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> To: linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Cc: bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org, Kamal Dasu <kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Subject: [PATCH 1/1] mtd: devices: m25p80: Add PM suspend resume support Date: Fri, 9 Sep 2016 15:13:58 -0400 [thread overview] Message-ID: <1473448438-13245-1-git-send-email-kdasu.kdev@gmail.com> (raw) Adding PM support so as to be able to probe spi-nor flash on resume. There are vendor specific commands to setup the transfer mode and enable read/write as part of spi_nor_scan(), done on intial probe and needed on resume(). The spi-nor stucture is private to the m25p driver and hence is the only place this can be done without having to duplicate code in controller driver. Signed-off-by: Kamal Dasu <kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> --- drivers/mtd/devices/m25p80.c | 37 ++++++++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 9cf7fcd..f8294b4 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -248,7 +248,6 @@ static int m25p_probe(struct spi_device *spi) data ? data->nr_parts : 0); } - static int m25p_remove(struct spi_device *spi) { struct m25p *flash = spi_get_drvdata(spi); @@ -319,10 +318,46 @@ static const struct of_device_id m25p_of_table[] = { }; 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); + struct flash_platform_data *data; + char *flash_name = NULL; + enum read_mode mode = SPI_NOR_NORMAL; + int ret; + + data = dev_get_platdata(&flash->spi->dev); + + if (data && data->type) + flash_name = data->type; + else if (!strcmp(flash->spi->modalias, "spi-nor")) + flash_name = NULL; /* auto-detect */ + else + flash_name = flash->spi->modalias; + + if (flash->spi->mode & SPI_RX_QUAD) + mode = SPI_NOR_QUAD; + else if (flash->spi->mode & SPI_RX_DUAL) + mode = SPI_NOR_DUAL; + + ret = spi_nor_scan(&flash->spi_nor, flash_name, mode); + + return ret; +} +#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 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Kamal Dasu <kdasu.kdev@gmail.com> To: linux-spi@vger.kernel.org, f.fainelli@gmail.com, linux-mtd@lists.infradead.org, computersforpeace@gmail.com Cc: bcm-kernel-feedback-list@broadcom.com, Kamal Dasu <kdasu.kdev@gmail.com> Subject: [PATCH 1/1] mtd: devices: m25p80: Add PM suspend resume support Date: Fri, 9 Sep 2016 15:13:58 -0400 [thread overview] Message-ID: <1473448438-13245-1-git-send-email-kdasu.kdev@gmail.com> (raw) Adding PM support so as to be able to probe spi-nor flash on resume. There are vendor specific commands to setup the transfer mode and enable read/write as part of spi_nor_scan(), done on intial probe and needed on resume(). The spi-nor stucture is private to the m25p driver and hence is the only place this can be done without having to duplicate code in controller driver. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> --- drivers/mtd/devices/m25p80.c | 37 ++++++++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 9cf7fcd..f8294b4 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -248,7 +248,6 @@ static int m25p_probe(struct spi_device *spi) data ? data->nr_parts : 0); } - static int m25p_remove(struct spi_device *spi) { struct m25p *flash = spi_get_drvdata(spi); @@ -319,10 +318,46 @@ static const struct of_device_id m25p_of_table[] = { }; 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); + struct flash_platform_data *data; + char *flash_name = NULL; + enum read_mode mode = SPI_NOR_NORMAL; + int ret; + + data = dev_get_platdata(&flash->spi->dev); + + if (data && data->type) + flash_name = data->type; + else if (!strcmp(flash->spi->modalias, "spi-nor")) + flash_name = NULL; /* auto-detect */ + else + flash_name = flash->spi->modalias; + + if (flash->spi->mode & SPI_RX_QUAD) + mode = SPI_NOR_QUAD; + else if (flash->spi->mode & SPI_RX_DUAL) + mode = SPI_NOR_DUAL; + + ret = spi_nor_scan(&flash->spi_nor, flash_name, mode); + + return ret; +} +#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
next reply other threads:[~2016-09-09 19:13 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-09-09 19:13 Kamal Dasu [this message] 2016-09-09 19:13 ` [PATCH 1/1] mtd: devices: m25p80: Add PM suspend resume support Kamal Dasu [not found] ` <1473448438-13245-1-git-send-email-kdasu.kdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-09-11 10:10 ` Geert Uytterhoeven 2016-09-11 10:10 ` Geert Uytterhoeven [not found] ` <CAMuHMdUb6nhzzkPy4z1tFouM+FAsNKhh=EXYFTSL00ziSUcKqw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-09-12 20:06 ` Kamal Dasu 2016-09-12 20:06 ` Kamal Dasu
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