[PATCH V2 4/4] dt-bindings: lpspi: New property in document DT bindings for LPSPI

[Clark Wang <xiaoning.wang@xxxxxxx>]

Add "fsl,spi-only-use-cs1-sel" to fit i.MX8DXL-EVK.
Spi common code does not support use of CS signals discontinuously.
It only uses CS1 without using CS0. So, add this property to re-config
chipselect value.

Signed-off-by: Clark Wang <xiaoning.wang@xxxxxxx>
---
Changes:
V2:
 - New patch added in the v2 patchset.
---
 Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml
index 143b94a1883a..22882e769e26 100644
--- a/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-fsl-lpspi.yaml
@@ -34,6 +34,12 @@ properties:
       - const: per
       - const: ipg
 
+  fsl,spi-only-use-cs1-sel:
+    description:
+      spi common code does not support use of CS signals discontinuously.
+      i.MX8DXL-EVK board only uses CS1 without using CS0. Therefore, add
+      this property to re-config the chipselect value in the LPSPI driver.
+
 required:
   - compatible
   - reg
@@ -57,4 +63,5 @@ examples:
                  <&clks IMX7ULP_CLK_DUMMY>;
         clock-names = "per", "ipg";
         spi-slave;
+        fsl,spi-only-use-cs1-sel;
     };
-- 
2.17.1