The sifive gpio IP block supports up to 32 GPIOs. Reflect that in the
interrupts property description and maxItems. Also add the standard
ngpios property to describe the number of GPIOs available on the
implementation.

Also add the "canaan,k210-gpiohs" compatible string to indicate the use
of this gpio controller in the Canaan Kendryte K210 SoC. If this
compatible string is used, do not define the clocks property as
required as the K210 SoC does not have a software controllable clock
for the Sifive gpio IP block.

Cc: Paul Walmsley <redacted>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Damien Le Moal <redacted>
---
 .../devicetree/bindings/gpio/sifive,gpio.yaml | 21 ++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/sifive,gpio.yaml b/Documentation/devicetree/bindings/gpio/sifive,gpio.yaml
index ab22056f8b44..2cef18ca737c 100644
--- a/Documentation/devicetree/bindings/gpio/sifive,gpio.yaml
+++ b/Documentation/devicetree/bindings/gpio/sifive,gpio.yaml

@@ -16,6 +16,7 @@ properties:
       - enum:
           - sifive,fu540-c000-gpio
           - sifive,fu740-c000-gpio
+          - canaan,k210-gpiohs
       - const: sifive,gpio0

   reg:

@@ -23,9 +24,9 @@ properties:

   interrupts:
     description:
-      interrupt mapping one per GPIO. Maximum 16 GPIOs.
+      interrupt mapping one per GPIO. Maximum 32 GPIOs.
     minItems: 1
-    maxItems: 16
+    maxItems: 32

   interrupt-controller: true

@@ -38,6 +39,10 @@ properties:
   "#gpio-cells":
     const: 2

+  ngpios:
+    minimum: 1
+    maximum: 32