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author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-11-12 12:44:29 (GMT) |
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committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-12-17 10:18:01 (GMT) |
commit | 9a040c9f2170e0e6d092fc7cf8289a4466b8d8d6 (patch) | |
tree | 7a34f661a9a14693291f8c628a1d8e44ed390d2e /Documentation/devicetree/bindings/serial | |
parent | 598604ff22109a025af8d5038664ebeb2402afdc (diff) | |
download | linux-9a040c9f2170e0e6d092fc7cf8289a4466b8d8d6.tar.xz |
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: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/devicetree/bindings/serial')
-rw-r--r-- | Documentation/devicetree/bindings/serial/renesas,sci-serial.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt index 7091213..31cc063 100644 --- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt @@ -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. |