[PATCH] gpio: of: don't warn if ignored GPIO flag matches the behavior

[Lucas Stach <l.stach@pengutronix.de>]

Some devicetrees specify the ACTIVE_LOW flag in the fixed regulator GPIO
handle. While this has always been ignored, it's consistent with the
behavior of the regulator binding in the absence of the
"enable-active-high" DT property. It doesn't make much sense to print a
user visible warning for a configuration which is consistent, so only
print the warning if the GPIO flag contradicts the behavior dictated by
by the enable-active-high property.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/gpio/gpiolib-of.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 1eea2c6c2e1d..0b5383706b91 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -134,18 +134,20 @@ static void of_gpio_flags_quirks(struct device_node *np,
 	     (!(strcmp(propname, "enable-gpio") &&
 		strcmp(propname, "enable-gpios")) &&
 	      of_device_is_compatible(np, "regulator-gpio")))) {
+		bool active_low =
+			!of_property_read_bool(np, "enable-active-high");
 		/*
 		 * The regulator GPIO handles are specified such that the
 		 * presence or absence of "enable-active-high" solely controls
 		 * the polarity of the GPIO line. Any phandle flags must
 		 * be actively ignored.
 		 */
-		if (*flags & OF_GPIO_ACTIVE_LOW) {
+		if ((*flags & OF_GPIO_ACTIVE_LOW) && !active_low) {
 			pr_warn("%s GPIO handle specifies active low - ignored\n",
 				of_node_full_name(np));
 			*flags &= ~OF_GPIO_ACTIVE_LOW;
 		}
-		if (!of_property_read_bool(np, "enable-active-high"))
+		if (active_low)
 			*flags |= OF_GPIO_ACTIVE_LOW;
 	}
 	/*
-- 
2.20.1