[PATCH v2 1/7] dt-bindings: input: syna,rmi4: document syna,pdt-fallback-desc

[Caleb Connolly <caleb.connolly@linaro.org>]

This new property allows devices to specify some register values which
are missing on units with third party replacement displays. These
displays use unofficial touch ICs which only implement a subset of the
RMI4 specification.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
---
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
To: Rob Herring <robh+dt@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
To: Conor Dooley <conor+dt@kernel.org>
Cc: devicetree@vger.kernel.org
---
 Documentation/devicetree/bindings/input/syna,rmi4.yaml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/syna,rmi4.yaml b/Documentation/devicetree/bindings/input/syna,rmi4.yaml
index 4d4e1a8e36be..1f4a2179e4d3 100644
--- a/Documentation/devicetree/bindings/input/syna,rmi4.yaml
+++ b/Documentation/devicetree/bindings/input/syna,rmi4.yaml
@@ -49,6 +49,21 @@ properties:
     description:
       Delay to wait after powering on the device.
 
+  syna,pdt-fallback-desc:
+    $ref: /schemas/types.yaml#/definitions/uint8-matrix
+    description:
+      An array of pairs of function number and version. These are used
+      on some devices with replacement displays that use unofficial touch
+      controllers. These controllers do report the properties of their Page
+      Descriptor Table (PDT) entries, but leave the function_number and
+      function_version registers blank. These values should match exactly
+      the 5th and 4th bytes of each PDT entry from the original display's
+      touch controller.
+    items:
+      items:
+        - description: The 5th byte of the PDT entry
+        - description: The 4th byte of the PDT entry
+
   vdd-supply: true
   vio-supply: true
 

-- 
2.42.0