diff options
| author |   Russell King <rmk+kernel@armlinux.org.uk> | 2019-06-10 20:10:50 +0300 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2019-06-12 11:13:41 +0200 |
| commit | 40bb2273a263ada2e563e1e601940e60bf7e53da (patch) | |
| tree | 0d49ce63bd7d4f567f252c6db8521ec98f0826d2 /drivers/gpio/gpio-omap.c | |
| parent | gpio: omap: move omap_gpio_request() and omap_gpio_free() (diff) | |
| download | linux-dev-40bb2273a263ada2e563e1e601940e60bf7e53da.tar.xz linux-dev-40bb2273a263ada2e563e1e601940e60bf7e53da.zip | |
gpio: omap: simplify omap_gpio_get_direction()
Architectures are single-copy atomic, which means that simply reading
a register is an inherently atomic operation. There is no need to
take a spinlock here.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-omap.c')
| -rw-r--r-- | drivers/gpio/gpio-omap.c | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index cc320d09d074..44a4287cce9e 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -953,17 +953,10 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset) static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset) { - struct gpio_bank *bank; - unsigned long flags; - void __iomem *reg; - int dir; + struct gpio_bank *bank = gpiochip_get_data(chip); - bank = gpiochip_get_data(chip); - reg = bank->base + bank->regs->direction; - raw_spin_lock_irqsave(&bank->lock, flags); - dir = !!(readl_relaxed(reg) & BIT(offset)); - raw_spin_unlock_irqrestore(&bank->lock, flags); - return dir; + return !!(readl_relaxed(bank->base + bank->regs->direction) & + BIT(offset)); } static int omap_gpio_input(struct gpio_chip *chip, unsigned offset) |