MIPS: OCTEON: Select ARCH_REQUIRE_GPIOLIB

... and create asm/mach-cavium-octeon/gpio.h so that things continue
to build.

This allows us to use the existing I2C connected GPIO expanders.
Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/5632/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -732,6 +732,7 @@ config CAVIUM_OCTEON_SOC
 	select USB_ARCH_HAS_OHCI
 	select USB_ARCH_HAS_EHCI
 	select HOLES_IN_ZONE
+	select ARCH_REQUIRE_GPIOLIB
 	help
 	  This option supports all of the Octeon reference boards from Cavium
 	  Networks. It builds a kernel that dynamically determines the Octeon

arch/mips/include/asm/mach-cavium-octeon/gpio.h

+#ifndef __ASM_MACH_CAVIUM_OCTEON_GPIO_H
+#define __ASM_MACH_CAVIUM_OCTEON_GPIO_H
+
+#ifdef CONFIG_GPIOLIB
+#define gpio_get_value	__gpio_get_value
+#define gpio_set_value	__gpio_set_value
+#define gpio_cansleep	__gpio_cansleep
+#else
+int gpio_request(unsigned gpio, const char *label);
+void gpio_free(unsigned gpio);
+int gpio_direction_input(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
+int gpio_get_value(unsigned gpio);
+void gpio_set_value(unsigned gpio, int value);
+#endif
+
+#include <asm-generic/gpio.h>
+
+#define gpio_to_irq	__gpio_to_irq
+
+#endif /* __ASM_MACH_GENERIC_GPIO_H */