[PATCH v2 1/2] gpio: vf610: add support to DT 'ngpios' property

[Hector Palacios <hector.palacios@xxxxxxxx>]

Default to hardcoded VF610_GPIO_PER_PORT (32 pins) but allow optional
generic 'ngpios' property to be specified from the device tree.

Signed-off-by: Hector Palacios <hector.palacios@xxxxxxxx>
---
 Documentation/devicetree/bindings/gpio/gpio-vf610.yaml | 6 ++++++
 drivers/gpio/gpio-vf610.c                              | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-vf610.yaml b/Documentation/devicetree/bindings/gpio/gpio-vf610.yaml
index a27f92950257..ba4ebdbc5546 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-vf610.yaml
+++ b/Documentation/devicetree/bindings/gpio/gpio-vf610.yaml
@@ -65,6 +65,12 @@ properties:
     minItems: 1
     maxItems: 4
 
+  ngpios:
+    description: The number of GPIO pins of the port
+    minimum: 1
+    maximum: 32
+    default: 32
+
 patternProperties:
   "^.+-hog(-[0-9]+)?$":
     type: object
diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
index 07e5e6323e86..4abdf75e9a0a 100644
--- a/drivers/gpio/gpio-vf610.c
+++ b/drivers/gpio/gpio-vf610.c
@@ -276,6 +276,7 @@ static int vf610_gpio_probe(struct platform_device *pdev)
 	struct vf610_gpio_port *port;
 	struct gpio_chip *gc;
 	struct gpio_irq_chip *girq;
+	u32 ngpios;
 	int i;
 	int ret;
 	bool dual_base;
@@ -353,7 +354,11 @@ static int vf610_gpio_probe(struct platform_device *pdev)
 	gc = &port->gc;
 	gc->parent = dev;
 	gc->label = dev_name(dev);
-	gc->ngpio = VF610_GPIO_PER_PORT;
+	ret = device_property_read_u32(dev, "ngpios", &ngpios);
+	if (ret || ngpios > VF610_GPIO_PER_PORT)
+		gc->ngpio = VF610_GPIO_PER_PORT;
+	else
+		gc->ngpio = (u16)ngpios;
 	gc->base = -1;
 
 	gc->request = gpiochip_generic_request;