gpio: omap: Give unique labels to each GPIO bank/chip

As we need to add GPIO lookup tables to the OMAP platforms, we
need to reference each GPIO chip with a unique label. Use the GPIO
base to name each chip, "gpio-0-31", "gpio-32-63" etc.

Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Santosh Shilimkar <ssantosh@kernel.org>
Cc: Kevin Hilman <khilman@kernel.org>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 05bae9f42f52..ab5035b96886 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -1060,6 +1060,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
 {
         struct gpio_irq_chip *irq;
         static int gpio;
+        const char *label;
         int irq_base = 0;
         int ret;
 
@@ -1081,7 +1082,11 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
                         bank->chip.parent = &omap_mpuio_device.dev;
                 bank->chip.base = OMAP_MPUIO(0);
         } else {
-                bank->chip.label = "gpio";
+                label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
+                                       gpio, gpio + bank->width - 1);
+                if (!label)
+                        return -ENOMEM;
+                bank->chip.label = label;
                 bank->chip.base = gpio;
         }
         bank->chip.ngpio = bank->width;