[PATCH 2/2] dt-bindings: spi: spi-fsl-lpspi: add num-cs for lpspi

[Han Xu <han.xu@xxxxxxx>]

Add num-cs property to support multiple cs for lpspi. This property is
optional.

Signed-off-by: Han Xu <han.xu@xxxxxxx>
---
 Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml
index 8b44284d30c6..94caa2b7e241 100644
--- a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml
@@ -56,6 +56,13 @@ properties:
       this property to re-config the chipselect value in the LPSPI driver.
     type: boolean
 
+  num-cs:
+    description:
+      number of chip selects.
+    minimum: 1
+    maximum: 2
+    default: 1
+
 required:
   - compatible
   - reg
@@ -80,4 +87,5 @@ examples:
         clock-names = "per", "ipg";
         spi-slave;
         fsl,spi-only-use-cs1-sel;
+        num-cs = <2>;
     };
-- 
2.25.1