[RFC PATCH 2/8] mtd: rawnand: ams-delta: Write protect device during probe

[Janusz Krzysztofik]

Initialize NWP GPIO pin low to protect the device from hazard during
probe.  Release write protection as soon as the device is under
control.

Signed-off-by: Janusz Krzysztofik <jmkrzy...@gmail.com>
---
 drivers/mtd/nand/raw/ams-delta.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/ams-delta.c b/drivers/mtd/nand/raw/ams-delta.c
index 48233d638d2a..6ac38e9cfa1a 100644
--- a/drivers/mtd/nand/raw/ams-delta.c
+++ b/drivers/mtd/nand/raw/ams-delta.c
@@ -219,8 +219,8 @@ static int ams_delta_init(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, priv);
 
-       /* Set chip enabled, but  */
-       priv->gpiod_nwp = devm_gpiod_get(&pdev->dev, "nwp", GPIOD_OUT_HIGH);
+       /* Set chip enabled but write protected */
+       priv->gpiod_nwp = devm_gpiod_get(&pdev->dev, "nwp", GPIOD_OUT_LOW);
        if (IS_ERR(priv->gpiod_nwp)) {
                err = PTR_ERR(priv->gpiod_nwp);
                dev_err(&pdev->dev, "NWP GPIO request failed (%d)\n", err);
@@ -267,6 +267,9 @@ static int ams_delta_init(struct platform_device *pdev)
        if (err)
                goto out_mtd;
 
+       /* As soon as the device is found, release write protection */
+       gpiod_set_value(priv->gpiod_nwp, 1);
+
        /* Register the partitions */
        mtd_device_register(mtd, partition_info, ARRAY_SIZE(partition_info));
 
@@ -288,6 +291,9 @@ static int ams_delta_cleanup(struct platform_device *pdev)
        struct mtd_info *mtd = nand_to_mtd(&priv->nand_chip);
        void __iomem *io_base = priv->io_base;
 
+       /* Apply write protection */
+       gpiod_set_value(priv->gpiod_nwp, 0);
+
        /* Release resources, unregister device */
        nand_release(mtd);
 
-- 
2.16.4