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authorPhil Edworthy <phil.edworthy@renesas.com>2018-04-26 19:19:47 +0300
committerLinus Walleij <linus.walleij@linaro.org>2018-05-16 15:35:24 +0300
commite6ca26abd37606ba4864f20c85d3fe4a2173b93f (patch)
tree18cab27e25f3380c1f300904034a6823dabd8ec9 /drivers/gpio/gpio-dwapb.c
parent413f9e991896a98c03da6b3c43dc7791a4d28d9a (diff)
downloadlinux-e6ca26abd37606ba4864f20c85d3fe4a2173b93f.tar.xz
gpio: dwapb: Add support for 1 interrupt per port A GPIO
The DesignWare GPIO IP can be configured for either 1 interrupt or 1 per GPIO in port A, but the driver currently only supports 1 interrupt. See the DesignWare DW_apb_gpio Databook description of the 'GPIO_INTR_IO' parameter. This change allows the driver to work with up to 32 interrupts, it will get as many interrupts as specified in the DT 'interrupts' property. It doesn't do anything clever with the different interrupts, it just calls the same handler used for single interrupt hardware. ACPI companion code provided by Hoan Tran <hotran@apm.com>. This was tested on X-Gene by Hoan. Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Hoan Tran <hotran@apm.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-dwapb.c')
-rw-r--r--drivers/gpio/gpio-dwapb.c46
1 files changed, 37 insertions, 9 deletions
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 226977f78482..7dcd06b11570 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -441,14 +441,19 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
irq_gc->chip_types[1].handler = handle_edge_irq;
if (!pp->irq_shared) {
- irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler,
- gpio);
+ int i;
+
+ for (i = 0; i < pp->ngpio; i++) {
+ if (pp->irq[i])
+ irq_set_chained_handler_and_data(pp->irq[i],
+ dwapb_irq_handler, gpio);
+ }
} else {
/*
* Request a shared IRQ since where MFD would have devices
* using the same irq pin
*/
- err = devm_request_irq(gpio->dev, pp->irq,
+ err = devm_request_irq(gpio->dev, pp->irq[0],
dwapb_irq_handler_mfd,
IRQF_SHARED, "gpio-dwapb-mfd", gpio);
if (err) {
@@ -524,7 +529,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
if (pp->idx == 0)
port->gc.set_config = dwapb_gpio_set_config;
- if (pp->irq)
+ if (pp->has_irq)
dwapb_configure_irqs(gpio, port, pp);
err = gpiochip_add_data(&port->gc, port);
@@ -535,7 +540,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
port->is_registered = true;
/* Add GPIO-signaled ACPI event support */
- if (pp->irq)
+ if (pp->has_irq)
acpi_gpiochip_request_interrupts(&port->gc);
return err;
@@ -601,13 +606,36 @@ dwapb_gpio_get_pdata(struct device *dev)
if (dev->of_node && pp->idx == 0 &&
fwnode_property_read_bool(fwnode,
"interrupt-controller")) {
- pp->irq = irq_of_parse_and_map(to_of_node(fwnode), 0);
- if (!pp->irq)
+ struct device_node *np = to_of_node(fwnode);
+ unsigned int j;
+
+ /*
+ * The IP has configuration options to allow a single
+ * combined interrupt or one per gpio. If one per gpio,
+ * some might not be used.
+ */
+ for (j = 0; j < pp->ngpio; j++) {
+ int irq = of_irq_get(np, j);
+ if (irq < 0)
+ continue;
+
+ pp->irq[j] = irq;
+ pp->has_irq = true;
+ }
+
+ if (!pp->has_irq)
dev_warn(dev, "no irq for port%d\n", pp->idx);
}
- if (has_acpi_companion(dev) && pp->idx == 0)
- pp->irq = platform_get_irq(to_platform_device(dev), 0);
+ if (has_acpi_companion(dev) && pp->idx == 0) {
+ unsigned int j;
+
+ for (j = 0; j < pp->ngpio; j++) {
+ pp->irq[j] = platform_get_irq(to_platform_device(dev), j);
+ if (pp->irq[j])
+ pp->has_irq = true;
+ }
+ }
pp->irq_shared = false;
pp->gpio_base = -1;