dm:gpio:mxc add a bank_index entry in platdata

Add a new entry in platdata structure and intialize
bank_index in mxc_plat array.
This new entry can avoid using `plat - mxc_plat` by using
`plat->bank_index`.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 8bb9e39b7231e522f87eaf9612ad5abf383931e7..c52dd19ce3daf9d1cfd8cf14533bffe94925e2d8 100644 (file)
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -23,6 +23,7 @@ enum mxc_gpio_direction {
 #define GPIO_PER_BANK                  32
 
 struct mxc_gpio_plat {
+       int bank_index;
        struct gpio_regs *regs;
 };
 
@@ -259,19 +260,19 @@ static const struct dm_gpio_ops gpio_mxc_ops = {
 };
 
 static const struct mxc_gpio_plat mxc_plat[] = {
-       { (struct gpio_regs *)GPIO1_BASE_ADDR },
-       { (struct gpio_regs *)GPIO2_BASE_ADDR },
-       { (struct gpio_regs *)GPIO3_BASE_ADDR },
+       { 0, (struct gpio_regs *)GPIO1_BASE_ADDR },
+       { 1, (struct gpio_regs *)GPIO2_BASE_ADDR },
+       { 2, (struct gpio_regs *)GPIO3_BASE_ADDR },
 #if defined(CONFIG_MX25) || defined(CONFIG_MX27) || defined(CONFIG_MX51) || \
                defined(CONFIG_MX53) || defined(CONFIG_MX6)
-       { (struct gpio_regs *)GPIO4_BASE_ADDR },
+       { 3, (struct gpio_regs *)GPIO4_BASE_ADDR },
 #endif
 #if defined(CONFIG_MX27) || defined(CONFIG_MX53) || defined(CONFIG_MX6)
-       { (struct gpio_regs *)GPIO5_BASE_ADDR },
-       { (struct gpio_regs *)GPIO6_BASE_ADDR },
+       { 4, (struct gpio_regs *)GPIO5_BASE_ADDR },
+       { 5, (struct gpio_regs *)GPIO6_BASE_ADDR },
 #endif
 #if defined(CONFIG_MX53) || defined(CONFIG_MX6)
-       { (struct gpio_regs *)GPIO7_BASE_ADDR },
+       { 6, (struct gpio_regs *)GPIO7_BASE_ADDR },
 #endif
 };
 
@@ -283,7 +284,7 @@ static int mxc_gpio_probe(struct udevice *dev)
        int banknum;
        char name[18], *str;
 
-       banknum = plat - mxc_plat;
+       banknum = plat->bank_index;
        sprintf(name, "GPIO%d_", banknum + 1);
        str = strdup(name);
        if (!str)