gpio: add helper GPIOD_FLAGS_OUTPUT

Add a macro to provide the GPIO output value according
the dir flags content.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/gpio/gpio-uclass.c

@@ -542,12 +542,9 @@ static int _dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
 	}
 
 	if (flags & GPIOD_IS_OUT) {
-		int value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0;
-
-		if (flags & GPIOD_ACTIVE_LOW)
-			value = !value;
-		ret = ops->direction_output(dev, desc->offset, value);
-	} else  if (flags & GPIOD_IS_IN) {
+		ret = ops->direction_output(dev, desc->offset,
+					    GPIOD_FLAGS_OUTPUT(flags));
+	} else if (flags & GPIOD_IS_IN) {
 		ret = ops->direction_input(dev, desc->offset);
 	}
 

include/asm-generic/gpio.h

@@ -129,6 +129,12 @@ struct gpio_desc {
 	 */
 };
 
+/* helper to compute the value of the gpio output */
+#define GPIOD_FLAGS_OUTPUT_MASK (GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE)
+#define GPIOD_FLAGS_OUTPUT(flags) \
+	(((((flags) & GPIOD_FLAGS_OUTPUT_MASK) == GPIOD_IS_OUT_ACTIVE) || \
+	  (((flags) & GPIOD_FLAGS_OUTPUT_MASK) == GPIOD_ACTIVE_LOW)))
+
 /**
  * dm_gpio_is_valid() - Check if a GPIO is valid
  *