staging: greybus: gpio: remove KERNEL_VERSION checks

No need to support older kernel versions in the Greybus GPIO driver, so
remove the checks as needed, we can now rely on all of the correct
GPIO core apis being present.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/gpio.c

@@ -404,11 +404,7 @@ static int gb_gpio_request_handler(struct gb_operation *op)
 	}
 
 	local_irq_disable();
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
-	generic_handle_irq_desc(irq, desc);
-#else
 	generic_handle_irq_desc(desc);
-#endif
 	local_irq_enable();
 
 	return 0;
@@ -684,11 +680,7 @@ static int gb_gpio_probe(struct gbphy_device *gbphy_dev,
 	gpio = &ggc->chip;
 
 	gpio->label = "greybus_gpio";
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
 	gpio->parent = &gbphy_dev->dev;
-#else
-	gpio->dev = &gbphy_dev->dev;
-#endif
 	gpio->owner = THIS_MODULE;
 
 	gpio->request = gb_gpio_request;
@@ -750,7 +742,7 @@ static void gb_gpio_remove(struct gbphy_device *gbphy_dev)
 		gbphy_runtime_get_noresume(gbphy_dev);
 
 	gb_connection_disable_rx(connection);
-	gb_gpiochip_remove(&ggc->chip);
+	gpiochip_remove(&ggc->chip);
 	gb_gpio_irqchip_remove(ggc);
 	gb_connection_disable(connection);
 	gb_connection_destroy(connection);

drivers/staging/greybus/kernel_ver.h

@@ -22,28 +22,6 @@
 #define CORE_OWNS_PSY_STRUCT
 #endif
 
-/*
- * The GPIO api sucks rocks in places, like removal, so work around their
- * explicit requirements of catching the return value for kernels older than
- * 3.17, which they explicitly changed in the 3.17 kernel.  Consistency is
- * overrated.
- */
-#include <linux/gpio.h>
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
-static inline void gb_gpiochip_remove(struct gpio_chip *chip)
-{
-	gpiochip_remove(chip);
-}
-#else
-static inline void gb_gpiochip_remove(struct gpio_chip *chip)
-{
-	int ret;
-
-	ret = gpiochip_remove(chip);
-}
-#endif
-
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
 #define MMC_HS400_SUPPORTED
 #define MMC_DDR52_DEFINED