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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.

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

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-11-12 13:44:29 +01:00
parent 598604ff22
commit 9a040c9f21
1 changed files with 5 additions and 0 deletions
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Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
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@ -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.