[PATCH 01/25] serial: sh-sci: Update DT binding documentation for external clock input

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Amend the DT bindings to include the optional external clock on
(H)SCI(F) and some SCIFA, where this pin can serve as a clock input,
depending on board wiring.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
---
 Documentation/devicetree/bindings/serial/renesas,sci-serial.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
index 2c9e6b8477e92792..8efc9b6f35637fbb 100644
--- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
+++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
@@ -43,6 +43,9 @@ Required properties:
   - clocks: Must contain a phandle and clock-specifier pair for each entry
     in clock-names.
   - clock-names: Must contain "fck" for the SCIx UART functional clock.
+    On (H)SCI(F) and some SCIFA, an additional clock may be specified:
+      - "hsck" for the optional external clock input (on HSCIF),
+      - "sck" for the optional external clock input (on other variants).
 
 Note: Each enabled SCIx UART should have an alias correctly numbered in the
 "aliases" node.
-- 
1.9.1

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