mtd: lpc32xx_slc: Make wp gpio optional

This patch supports missing wp gpio.

Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/mtd/nand/lpc32xx_slc.c b/drivers/mtd/nand/lpc32xx_slc.c
index 1d837b92ac79..1577a9b0d0c2 100644
--- a/drivers/mtd/nand/lpc32xx_slc.c
+++ b/drivers/mtd/nand/lpc32xx_slc.c
@@ -192,7 +192,7 @@ struct lpc32xx_nand_cfg_slc {
         uint32_t rhold;
         uint32_t rsetup;
         bool use_bbt;
-        unsigned wp_gpio;
+        int wp_gpio;
         struct mtd_partition *parts;
         unsigned num_parts;
 };
@@ -295,7 +295,8 @@ static int lpc32xx_nand_device_ready(struct mtd_info *mtd)
  */
 static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
 {
-        gpio_set_value(host->ncfg->wp_gpio, 0);
+        if (gpio_is_valid(host->ncfg->wp_gpio))
+                gpio_set_value(host->ncfg->wp_gpio, 0);
 }
 
 /*
@@ -303,7 +304,8 @@ static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
  */
 static void lpc32xx_wp_disable(struct lpc32xx_nand_host *host)
 {
-        gpio_set_value(host->ncfg->wp_gpio, 1);
+        if (gpio_is_valid(host->ncfg->wp_gpio))
+                gpio_set_value(host->ncfg->wp_gpio, 1);
 }
 
 /*
@@ -819,7 +821,8 @@ static int __devinit lpc32xx_nand_probe(struct platform_device *pdev)
                 dev_err(&pdev->dev, "Missing platform data\n");
                 return -ENOENT;
         }
-        if (gpio_request(host->ncfg->wp_gpio, "NAND WP")) {
+        if (gpio_is_valid(host->ncfg->wp_gpio) &&
+                        gpio_request(host->ncfg->wp_gpio, "NAND WP")) {
                 dev_err(&pdev->dev, "GPIO not available\n");
                 return -EBUSY;
         }