gpio: pl061: add new property for gpio base
If gpio base number isn't specified, the gpio base will be find from
the end of gpio number. In order to keep with schematics, add a new
property "linux,gpio-base" to specify the gpio number in DTS file.
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
diff --git a/Documentation/devicetree/bindings/gpio/gpio-pl061.txt b/Documentation/devicetree/bindings/gpio/gpio-pl061.txt
new file mode 100644
index 0000000..6872067
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-pl061.txt
@@ -0,0 +1,33 @@
+PL061 GPIO controller bindings
+
+Required properties:
+- compatible:
+ - "arm,pl061", "arm,primecell".
+- #gpio-cells : Should be two.
+ - first cell is the gpio pin number
+ - second cell is used to specify the gpio polarity:
+ 0 = active high
+ 1 = active low
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupt-controller : Marks the device node as an interrupt controller.
+- #interrupt-cells : Should be two.
+ - first cell is the hw irq number
+ - second cell is used to specify the interrupt type:
+ 0 = default, unspecified type
+ 1 = rising edge triggered
+ 2 = falling edge triggered
+ 4 = high level triggered
+ 8 = low level triggered
+- linux,gpio-base : Should be the global GPIO number.
+
+Example:
+ gpio0: gpio@fc806000 {
+ compatible = "arm,pl061", "arm,primecell";
+ reg = <0xfc806000 0x1000>;
+ interrupts = <0 64 0x4>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ linux,gpio-base = <0>;
+ };
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index b4d4211..23f27fd 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -256,6 +256,19 @@
.xlate = irq_domain_xlate_twocell,
};
+/* Parse gpio base from DT */
+static int pl061_parse_gpio_base(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ if (of_property_read_u32(np, "linux,gpio-base", &ret))
+ return -ENOENT;
+ if (ret >= 0)
+ return ret;
+ return -EINVAL;
+}
+
static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
{
struct device *dev = &adev->dev;
@@ -273,7 +286,7 @@
if (irq_base <= 0)
return -ENODEV;
} else {
- chip->gc.base = -1;
+ chip->gc.base = pl061_parse_gpio_base(dev);
irq_base = 0;
}
