gpio: of: Optimize quirk checks

Simple string comparisons are cheaper than DT lookups, as the latter
involve taking a spinlock and traversing properties.
Hence optimize quirk checks by postponing DT lookups after string
comparisons.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 6a3ec57..3a6bb53 100644 (file)
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -86,9 +86,9 @@ static void of_gpio_flags_quirks(struct device_node *np,
        if (IS_ENABLED(CONFIG_REGULATOR) &&
            (of_device_is_compatible(np, "regulator-fixed") ||
             of_device_is_compatible(np, "reg-fixed-voltage") ||
-            (of_device_is_compatible(np, "regulator-gpio") &&
-             !(strcmp(propname, "enable-gpio") &&
-               strcmp(propname, "enable-gpios"))))) {
+            (!(strcmp(propname, "enable-gpio") &&
+               strcmp(propname, "enable-gpios")) &&
+             of_device_is_compatible(np, "regulator-gpio")))) {
                /*
                 * The regulator GPIO handles are specified such that the
                 * presence or absence of "enable-active-high" solely controls
@@ -119,9 +119,8 @@ static void of_gpio_flags_quirks(struct device_node *np,
         * property named "cs-gpios" we need to inspect the child node
         * to determine if the flags should have inverted semantics.
         */
-       if (IS_ENABLED(CONFIG_SPI_MASTER) &&
-           of_property_read_bool(np, "cs-gpios") &&
-           !strcmp(propname, "cs-gpios")) {
+       if (IS_ENABLED(CONFIG_SPI_MASTER) && !strcmp(propname, "cs-gpios") &&
+           of_property_read_bool(np, "cs-gpios")) {
                struct device_node *child;
                u32 cs;
                int ret;