[PATCH v18 07/16] dt-bindings: fix sifive gpio properties

[Damien Le Moal]

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 <paul.walmsley at sifive.com>
Cc: Rob Herring <robh at kernel.org>
Cc: devicetree at vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
---
 .../devicetree/bindings/gpio/sifive,gpio.yaml | 25 ++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/sifive,gpio.yaml b/Documentation/devicetree/bindings/gpio/sifive,gpio.yaml
index ab22056f8b44..c2902aac2514 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 +39,14 @@ properties:
   "#gpio-cells":
     const: 2
 
+  ngpios:
+    description:
+      The number of GPIOs available on the controller implementation.
+      It is 16 for the SiFive SoCs and 32 for the Canaan K210.
+    minimum: 1
+    maximum: 32
+    default: 16
+
   gpio-controller: true
 
 required:
@@ -46,10 +55,20 @@ required:
   - interrupts
   - interrupt-controller
   - "#interrupt-cells"
-  - clocks
   - "#gpio-cells"
   - gpio-controller
 
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - sifive,fu540-c000-gpio
+          - sifive,fu740-c000-gpio
+then:
+  required:
+    - clocks
+
 additionalProperties: false
 
 examples:
-- 
2.29.2