Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux

Pull GPIO changes from Grant Likely:
 "This branch contains the usual set of individual driver improvements
  and bug fixes, as well as updates to the core code.  The more notable
  changes include:

   - Internally add new API for referencing GPIOs by gpio_desc instead
     of number.  Eventually this will become a public API

   - ACPI GPIO binding support"

* tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux: (33 commits)
  arm64: select ARCH_WANT_OPTIONAL_GPIOLIB
  gpio: em: Use irq_domain_add_simple() to fix runtime error
  gpio: using common order: let 'static const' instead of 'const static'
  gpio/vt8500: memory cleanup missing
  gpiolib: Fix locking on gpio debugfs files
  gpiolib: let gpio_chip reference its descriptors
  gpiolib: use descriptors internally
  gpiolib: use gpio_chips list in gpiochip_find_base
  gpiolib: use gpio_chips list in sysfs ops
  gpiolib: use gpio_chips list in gpiochip_find
  gpiolib: use gpio_chips list in gpiolib_sysfs_init
  gpiolib: link all gpio_chips using a list
  gpio/langwell: cleanup driver
  gpio/langwell: Add Cloverview ids to pci device table
  gpio/lynxpoint: add chipset gpio driver.
  gpiolib: add missing braces in gpio_direction_show
  gpiolib-acpi: Fix error checks in interrupt requesting
  gpio: mpc8xxx: don't set IRQ_TYPE_NONE when creating irq mapping
  gpiolib: remove gpiochip_reserve()
  arm: pxa: tosa: do not use gpiochip_reserve()
  ...

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
index 45d97c46831a..25000b0f8453 100644
--- a/drivers/gpio/gpio-mxs.c
+++ b/drivers/gpio/gpio-mxs.c
@@ -66,6 +66,7 @@ struct mxs_gpio_port {
 	struct irq_domain *domain;
 	struct bgpio_chip bgc;
 	enum mxs_gpio_id devid;
+	u32 both_edges;
 };
 
 static inline int is_imx23_gpio(struct mxs_gpio_port *port)
@@ -82,13 +83,23 @@ static inline int is_imx28_gpio(struct mxs_gpio_port *port)
 
 static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
 {
+	u32 val;
 	u32 pin_mask = 1 << d->hwirq;
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct mxs_gpio_port *port = gc->private;
 	void __iomem *pin_addr;
 	int edge;
 
+	port->both_edges &= ~pin_mask;
 	switch (type) {
+	case IRQ_TYPE_EDGE_BOTH:
+		val = gpio_get_value(port->bgc.gc.base + d->hwirq);
+		if (val)
+			edge = GPIO_INT_FALL_EDGE;
+		else
+			edge = GPIO_INT_RISE_EDGE;
+		port->both_edges |= pin_mask;
+		break;
 	case IRQ_TYPE_EDGE_RISING:
 		edge = GPIO_INT_RISE_EDGE;
 		break;
@@ -125,6 +136,23 @@ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
 	return 0;
 }
 
+static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio)
+{
+	u32 bit, val, edge;
+	void __iomem *pin_addr;
+
+	bit = 1 << gpio;
+
+	pin_addr = port->base + PINCTRL_IRQPOL(port);
+	val = readl(pin_addr);
+	edge = val & bit;
+
+	if (edge)
+		writel(bit, pin_addr + MXS_CLR);
+	else
+		writel(bit, pin_addr + MXS_SET);
+}
+
 /* MXS has one interrupt *per* gpio port */
 static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
 {
@@ -138,6 +166,9 @@ static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
 
 	while (irq_stat != 0) {
 		int irqoffset = fls(irq_stat) - 1;
+		if (port->both_edges & (1 << irqoffset))
+			mxs_flip_edge(port, irqoffset);
+
 		generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
 		irq_stat &= ~(1 << irqoffset);
 	}