dts: bindings: semtech,sx1509b: add fixed ngpios property
Unlike most other GPIO controllers which support 32 pins this device
only supports 16. (There is an SX1508B that has 8 pins, but the
driver doesn't support it.)
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
diff --git a/boards/arm/nrf52_pca20020/nrf52_pca20020.dts b/boards/arm/nrf52_pca20020/nrf52_pca20020.dts
index 7bd7c3f..57273be 100644
--- a/boards/arm/nrf52_pca20020/nrf52_pca20020.dts
+++ b/boards/arm/nrf52_pca20020/nrf52_pca20020.dts
@@ -90,6 +90,7 @@
label = "GPIO_P0";
gpio-controller;
#gpio-cells = <2>;
+ ngpios = <16>;
};
lps22hb_press: lps22hb_press@5c {
diff --git a/dts/bindings/gpio/semtech,sx1509b-gpio.yaml b/dts/bindings/gpio/semtech,sx1509b-gpio.yaml
index 2d5f884..ac3cd2e 100644
--- a/dts/bindings/gpio/semtech,sx1509b-gpio.yaml
+++ b/dts/bindings/gpio/semtech,sx1509b-gpio.yaml
@@ -17,6 +17,10 @@
"#gpio-cells":
const: 2
+ ngpios:
+ required: true
+ const: 16
+
gpio-cells:
- pin
- flags
