Commit e7a718f9 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Linus Walleij

gpio: merrifield: Add support for hardware debouncer

By default all pins are configured to use a glitch filter. Writing 1 to the
certain bit of the specific register might be useful in case someone needs to
bypass the glitch filter completely for a given GPIO pin.

This patch adds support for that in the Intel Merrifield GPIO driver.
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent f4e81c52
...@@ -161,6 +161,27 @@ static int mrfld_gpio_direction_output(struct gpio_chip *chip, ...@@ -161,6 +161,27 @@ static int mrfld_gpio_direction_output(struct gpio_chip *chip,
return 0; return 0;
} }
static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
unsigned int debounce)
{
struct mrfld_gpio *priv = gpiochip_get_data(chip);
void __iomem *gfbr = gpio_reg(chip, offset, GFBR);
unsigned long flags;
u32 value;
raw_spin_lock_irqsave(&priv->lock, flags);
if (debounce)
value = readl(gfbr) & ~BIT(offset % 32);
else
value = readl(gfbr) | BIT(offset % 32);
writel(value, gfbr);
raw_spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static void mrfld_irq_ack(struct irq_data *d) static void mrfld_irq_ack(struct irq_data *d)
{ {
struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d); struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d);
...@@ -384,6 +405,7 @@ static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id ...@@ -384,6 +405,7 @@ static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id
priv->chip.direction_output = mrfld_gpio_direction_output; priv->chip.direction_output = mrfld_gpio_direction_output;
priv->chip.get = mrfld_gpio_get; priv->chip.get = mrfld_gpio_get;
priv->chip.set = mrfld_gpio_set; priv->chip.set = mrfld_gpio_set;
priv->chip.set_debounce = mrfld_gpio_set_debounce;
priv->chip.base = gpio_base; priv->chip.base = gpio_base;
priv->chip.ngpio = MRFLD_NGPIO; priv->chip.ngpio = MRFLD_NGPIO;
priv->chip.can_sleep = false; priv->chip.can_sleep = false;
......
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