This patch adds pin name support in the GPIO driver. With this patch applied, 
the gpio command supports pins to be addressed with friendly names.

Please note:
Function gpio_name_to_pin checks for set bits getting lost in translation and 
returns -EINVAL if this occurs, but a correctly translated name doesn't 
automatically produce a valid pin. It only means the bank/pin numbers fit the 
designated bitfields. After successful translation, validity needs to be 
checked separately.

Signed-off-by: Robert Deliën <robert at delien.nl>

diff --git a/arch/arm/include/asm/arch-mx28/gpio.h 
b/arch/arm/include/asm/arch-mx28/gpio.h
index 5abd7b1..37d3e88 100644
--- a/arch/arm/include/asm/arch-mx28/gpio.h
+++ b/arch/arm/include/asm/arch-mx28/gpio.h
@@ -26,6 +26,9 @@
 #ifdef CONFIG_MXS_GPIO
 void mxs_gpio_init(void);
 
+extern int gpio_name_to_pin(const char *name);
+#define gpio_name_to_pin(name) gpio_name_to_pin(name)
+
 extern int gpio_invalid(int gp);
 #define gpio_invalid(gpio) gpio_invalid(gpio)
 
diff --git a/arch/blackfin/include/asm/gpio.h b/arch/blackfin/include/asm/gpio.h
index 224688f..8128df1 100644
--- a/arch/blackfin/include/asm/gpio.h
+++ b/arch/blackfin/include/asm/gpio.h
@@ -1,7 +1,24 @@
 /*
- * Copyright 2006-2009 Analog Devices Inc.
+ * (C) Copyright 2006-2009
+ * Analog Devices Inc.
  *
- * Licensed under the GPL-2 or later.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
  */
 
 #ifndef __ARCH_BLACKFIN_GPIO_H__
@@ -199,7 +216,7 @@ static inline int gpio_is_valid(int number)
 
 #include <linux/ctype.h>
 
-static inline int name_to_gpio(const char *name)
+static inline int gpio_name_to_pin(const char *name)
 {
        int port_base;
 
@@ -246,7 +263,7 @@ static inline int name_to_gpio(const char *name)
 
        return port_base + simple_strtoul(name, NULL, 10);
 }
-#define name_to_gpio(n) name_to_gpio(n)
+#define gpio_name_to_pin(n) gpio_name_to_pin(n)
 
 #define gpio_status() bfin_gpio_labels()
 
diff --git a/common/cmd_gpio.c b/common/cmd_gpio.c
index 51e11e7..8a70d0c 100644
--- a/common/cmd_gpio.c
+++ b/common/cmd_gpio.c
@@ -1,9 +1,24 @@
 /*
- * Control GPIO pins on the fly
+ * (C) Copyright 2008-2011
+ * Analog Devices Inc.
  *
- * Copyright (c) 2008-2011 Analog Devices Inc.
+ * See file CREDITS for list of people who contributed to this
+ * project.
  *
- * Licensed under the GPL-2 or later.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
  */
 
 #include <common.h>
@@ -11,8 +26,8 @@
 
 #include <asm/gpio.h>
 
-#ifndef name_to_gpio
-#define name_to_gpio(name) simple_strtoul(name, NULL, 10)
+#ifndef gpio_name_to_pin
+#define gpio_name_to_pin(name) simple_strtoul(name, NULL, 10)
 #endif
 
 #ifndef gpio_invalid
@@ -41,8 +56,8 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char 
* const argv[])
 #endif
 
        if (argc != 3)
- show_usage:
-               return cmd_usage(cmdtp);
+               goto show_usage;
+
        str_cmd = argv[1];
        str_gpio = argv[2];
 
@@ -56,9 +71,11 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, 
char * const argv[])
        }
 
        /* turn the gpio name into a gpio number */
-       gpio = name_to_gpio(str_gpio);
-       if (gpio < 0)
-               goto show_usage;
+       gpio = gpio_name_to_pin(str_gpio);
+       if (gpio < 0) {
+               printf("gpio: unknown pin %s\n", str_gpio);
+               return -1;
+       }
 
        /* check bank and pin number for validity */
        if (gpio_invalid(gpio)) {
@@ -91,6 +108,8 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, 
char * const argv[])
        gpio_free(gpio);
 
        return value;
+show_usage:
+       return cmd_usage(cmdtp);
 }
 
 U_BOOT_CMD(gpio, 3, 0, do_gpio,
diff --git a/drivers/gpio/mxs_gpio.c b/drivers/gpio/mxs_gpio.c
index dabee90..8ec57d6 100644
--- a/drivers/gpio/mxs_gpio.c
+++ b/drivers/gpio/mxs_gpio.c
@@ -23,6 +23,7 @@
  * MA 02111-1307 USA
  */
 
+#include <linux/ctype.h>
 #include <common.h>
 #include <netdev.h>
 #include <asm/errno.h>
@@ -81,6 +82,46 @@ void mxs_gpio_init(void)
        }
 }
 
+int gpio_name_to_pin(const char *name)
+{
+       int bank;
+       int pin;
+       char *endptr;
+
+       if (!name)
+               return -EINVAL;
+
+       if (name[0] >= '0' && name[0] <= '9') {
+               pin = simple_strtoul(name, &endptr, 10);
+               if (endptr[0])
+                       return -EINVAL;
+               if (pin & ~(MXS_PAD_BANK_MASK | MXS_PAD_PIN_MASK))
+                       return -EINVAL;
+
+               return pin;
+       }
+
+       if (tolower(name[0]) != 'b')
+               return -EINVAL;
+       name++;
+       bank = simple_strtoul(name, &endptr, 10);
+       if (bank & ~(MXS_PAD_BANK_MASK >> MXS_PAD_BANK_SHIFT))
+               return -EINVAL;
+
+       if (tolower(name[0]) != 'p')
+               return -EINVAL;
+       name = endptr + 1;
+       pin = simple_strtoul(name, &endptr, 10);
+       if (pin & ~(MXS_PAD_PIN_MASK >> MXS_PAD_PIN_SHIFT))
+               return -EINVAL;
+
+       if (endptr[0])
+               return -EINVAL;
+
+       return ((bank << MXS_PAD_BANK_SHIFT) & MXS_PAD_BANK_MASK) |
+              ((pin  << MXS_PAD_PIN_SHIFT ) & MXS_PAD_PIN_MASK );
+}
+
 int gpio_invalid(int gp)
 {
        if ( (gp & ~(MXS_PAD_BANK_MASK | MXS_PAD_PIN_MASK)) ||

_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot

Reply via email to