gpio: provide stubs for devres gpio functions

commit 6b3d8145dcfdbbb43f13544e16f44f4574f941dd
"gpiolib: make GPIO_DEVRES depend on GPIOLIB"
breaks builds when device drivers are using devm_gpio*
devres functions without enabling GPIOLIB, relying on
the devres code to be compiled anyway.

Provide stubs so that we get these if we're using the
devres functions without GPIOLIB.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index c691df04445812c7ffae964be58d66c63e8ecaa6..0c56b9e9c20977edbc0c50cb033bf33510837ce5 100644 (file)
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -77,6 +77,15 @@ static inline int irq_to_gpio(unsigned int irq)
 
 #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
 
+/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
+
+struct device;
+
+int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
+int devm_gpio_request_one(struct device *dev, unsigned gpio,
+                         unsigned long flags, const char *label);
+void devm_gpio_free(struct device *dev, unsigned int gpio);
+
 #else /* ! CONFIG_GPIOLIB */
 
 #include <linux/kernel.h>
@@ -241,14 +250,25 @@ gpiochip_remove_pin_ranges(struct gpio_chip *chip)
        WARN_ON(1);
 }
 
-#endif /* ! CONFIG_GPIOLIB */
+static inline int devm_gpio_request(struct device *dev, unsigned gpio,
+                                   const char *label)
+{
+       WARN_ON(1);
+       return -EINVAL;
+}
 
-struct device;
+static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
+                                       unsigned long flags, const char *label)
+{
+       WARN_ON(1);
+       return -EINVAL;
+}
 
-/* bindings for managed devices that want to request gpios */
-int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
-int devm_gpio_request_one(struct device *dev, unsigned gpio,
-                         unsigned long flags, const char *label);
-void devm_gpio_free(struct device *dev, unsigned int gpio);
+static inline void devm_gpio_free(struct device *dev, unsigned int gpio)
+{
+       WARN_ON(1);
+}
+
+#endif /* ! CONFIG_GPIOLIB */
 
 #endif /* __LINUX_GPIO_H */