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authorGeert Uytterhoeven <geert+renesas@glider.be>2019-03-29 09:42:29 +0100
committerLinus Walleij <linus.walleij@linaro.org>2019-04-08 13:03:26 +0200
commita71a81e7975843504170e69fe52605478f3c8e04 (patch)
tree022e8ffc9b19c00d50cc766f46c487d8dad466d0 /drivers/gpio
parentMerge tag 'v5.1-rc3' into devel (diff)
downloadlinux-a71a81e7975843504170e69fe52605478f3c8e04.tar.xz
linux-a71a81e7975843504170e69fe52605478f3c8e04.zip
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib-of.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 6a3ec575a404..3a6bb53d89df 100644
--- 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;