MIPS: BCM47XX: Get GPIO pin from nvram configuration

The nvram contains some gpio configuration for boards. It is stored in
a gpio<number>=name format e.g.
gpio8=wps_button
gpio4=robo_reset

This patches adds a function to parse these entries, so other driver
can use it.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5841/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
index cc40b74940f5f6531e4e74cfcf4c665a7b13a9fd..b4c585b1c62eb6279504daea7e1f3a2e7d0b777d 100644 (file)
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -190,3 +190,23 @@ int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len)
        return -ENOENT;
 }
 EXPORT_SYMBOL(bcm47xx_nvram_getenv);
+
+int bcm47xx_nvram_gpio_pin(const char *name)
+{
+       int i, err;
+       char nvram_var[10];
+       char buf[30];
+
+       for (i = 0; i < 16; i++) {
+               err = snprintf(nvram_var, sizeof(nvram_var), "gpio%i", i);
+               if (err <= 0)
+                       continue;
+               err = bcm47xx_nvram_getenv(nvram_var, buf, sizeof(buf));
+               if (err <= 0)
+                       continue;
+               if (!strcmp(name, buf))
+                       return i;
+       }
+       return -ENOENT;
+}
+EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);

diff --git a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
index b8e7be8f34dd472076b7ffd10d7de2d14c11b638..36a3fc1aa3ae326def39379e03db8258c24d82d3 100644 (file)
--- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx_nvram.h
@@ -48,4 +48,6 @@ static inline void bcm47xx_nvram_parse_macaddr(char *buf, u8 macaddr[6])
                printk(KERN_WARNING "Can not parse mac address: %s\n", buf);
 }
 
+int bcm47xx_nvram_gpio_pin(const char *name);
+
 #endif /* __BCM47XX_NVRAM_H */