mtd: spi-nor: fsl-qspi: support deep sleep mode for imx6 sx chip

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=45c6a0caeb2bde9e043bcd833af322db57a37498
Commit:     45c6a0caeb2bde9e043bcd833af322db57a37498
Parent:     7c272ac5eefb329501aadbd9f21f86232c0f66a9
Author:     Allen Xu <b45815 at freescale.com>
AuthorDate: Tue Jan 13 04:56:40 2015 +0800
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Thu Jan 15 19:30:30 2015 -0800

    mtd: spi-nor: fsl-qspi: support deep sleep mode for imx6 sx chip
    
    i.mx6 sx support turn off fastmix and megamix power.
    qpsi controller can be turned off and all status lost when suspend/resume.
    add suspend/resume functions and reset qspi controller when resume.
    
    Signed-off-by: Allen Xu <b45815 at freescale.com>
    Signed-off-by: Frank Li <Frank.Li at freescale.com>
    Acked-by: Huang Shijie <shijie.huang at intel.com>
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 39763b9..9d608007 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -972,6 +972,22 @@ static int fsl_qspi_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int fsl_qspi_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	return 0;
+}
+
+static int fsl_qspi_resume(struct platform_device *pdev)
+{
+	struct fsl_qspi *q = platform_get_drvdata(pdev);
+
+	fsl_qspi_nor_setup(q);
+	fsl_qspi_set_map_addr(q);
+	fsl_qspi_nor_setup_last(q);
+
+	return 0;
+}
+
 static struct platform_driver fsl_qspi_driver = {
 	.driver = {
 		.name	= "fsl-quadspi",
@@ -980,6 +996,8 @@ static struct platform_driver fsl_qspi_driver = {
 	},
 	.probe          = fsl_qspi_probe,
 	.remove		= fsl_qspi_remove,
+	.suspend	= fsl_qspi_suspend,
+	.resume		= fsl_qspi_resume,
 };
 module_platform_driver(fsl_qspi_driver);