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Commit 9a040c9f authored by Geert Uytterhoeven's avatar Geert Uytterhoeven
Browse files

serial: sh-sci: Update DT binding documentation for external clock input 



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.

Clarify the use of the divided functional clock as a source for the
sampling clock.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 598604ff

Documentation/devicetree/bindings/serial/renesas,sci-serial.txt

+5 −0
Original line number Diff line number Diff line
@@ -51,6 +51,11 @@ 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.

    Apart from the divided functional clock, there may be other possible

    sources for the sampling clock, depending on SCIx variant.

    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.