From: Geert Uytterhoeven Date: Thu, 12 Nov 2015 12:44:29 +0000 (+0100) Subject: serial: sh-sci: Update DT binding documentation for external clock input X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9a040c9f2170e0e6d092fc7cf8289a4466b8d8d6;p=linux-beck.git 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 Acked-by: Greg Kroah-Hartman --- diff --git a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt index 7091213f0251..31cc0631ef7c 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.