gpio: omap: fix omap_gpio_free to not clean up irq configuration

This patch fixes following issue:
- GPIOn is used as IRQ by some dev, for example PCF8575.INT ->  gpio6.11
- PCFx driver knows nothing about type of IRQ line (GPIO or not)
  so it doesn't request gpio and just do request_irq()
- If gpio6.11 will be exported through the sysfs and then un-xeported
then IRQs from PCFx will not be received any more, because
IRQ configuration for gpio6.11 will be cleaned up unconditionally
in omap_gpio_free.

Fix this by removing all GPIO IRQ specific code from omap_gpio_free()
and also do GPIO clean up (change direction to 'in' and disable debounce)
only if corresponding GPIO is not used as IRQ too.
GPIO IRQ will be properly cleaned up by GPIO irqchip code.

Signed-off-by: Grygorii Strashko <grygorii.strashko@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 6efee35f0ad44da69399161f6d35887a6de6a7e3..505266153b4c7036445517118acae3d02ffd36f4 100644 (file)
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -690,8 +690,11 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
 
        spin_lock_irqsave(&bank->lock, flags);
        bank->mod_usage &= ~(BIT(offset));
+       if (!LINE_USED(bank->irq_usage, offset)) {
+               omap_set_gpio_direction(bank, offset, 1);
+               omap_clear_gpio_debounce(bank, offset);
+       }
        omap_disable_gpio_module(bank, offset);
-       omap_reset_gpio(bank, offset);
        spin_unlock_irqrestore(&bank->lock, flags);
 
        /*