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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>
This commit is contained in:
Geert Uytterhoeven 2019-03-29 09:42:29 +01:00 committed by Linus Walleij
parent 26af34079f
commit a71a81e797
1 changed files with 5 additions and 6 deletions
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11
drivers/gpio/gpiolib-of.c
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@ -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;