gpio: sandbox: Make sandbox_gpio_set_flags() set all flags

Allow this function to see all flags, including the internal sandbox ones.
This allows the tests to fully control the behaviour of the driver.

To make this work, move the setting of GPIOD_EXT_HIGH -to where the flags
are updated via driver model, rather than the sandbox 'back door'.

Signed-off-by: Simon Glass <sjg@chromium.org>

Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>

drivers/gpio/sandbox.c

@@ -114,13 +114,7 @@ int sandbox_gpio_set_flags(struct udevice *dev, uint offset, ulong flags)
 {
 	struct gpio_state *state = get_gpio_state(dev, offset);
 
-	/*
-	 * We don't need to clear GPIOD_EXT_HIGH here to make the tests pass,
-	 * but this is handled in a future patch.
-	 */
-	if (flags & GPIOD_IS_OUT_ACTIVE)
-		flags |= GPIOD_EXT_HIGH;
-	state->flags = (state->flags & GPIOD_SANDBOX_MASK) | flags;
+	state->flags = flags;
 
 	return 0;
 }
@@ -221,14 +215,23 @@ static int sb_gpio_set_flags(struct udevice *dev, unsigned int offset,
 			     ulong flags)
 {
 	debug("%s: offset:%u, flags = %lx\n", __func__, offset, flags);
+	struct gpio_state *state = get_gpio_state(dev, offset);
 
-	return sandbox_gpio_set_flags(dev, offset, flags);
+	if (flags & GPIOD_IS_OUT) {
+		if (flags & GPIOD_IS_OUT_ACTIVE)
+			flags |= GPIOD_EXT_HIGH;
+		else
+			flags &= ~GPIOD_EXT_HIGH;
+	}
+	state->flags = flags;
+
+	return 0;
 }
 
 static int sb_gpio_get_flags(struct udevice *dev, uint offset, ulong *flagsp)
 {
 	debug("%s: offset:%u\n", __func__, offset);
-	*flagsp = *get_gpio_flags(dev, offset);
+	*flagsp = *get_gpio_flags(dev, offset) & ~GPIOD_SANDBOX_MASK;
 
 	return 0;
 }