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serial: sh-sci: Update DT binding documentation for BRG support

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Amend the DT bindings to include the optional clock sources for the Baud
Rate Generator for External Clock (BRG), as found on some SCIF variants
and on HSCIF.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-10-26 09:43:22 +01:00
parent 9a040c9f21
commit 176ae5f674
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
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@ -56,6 +56,12 @@ Required properties:
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).
On UARTs equipped with a Baud Rate Generator for External Clock (BRG)
(some SCIF and HSCIF), additional clocks may be specified:
- "brg_int" for the optional internal clock source for the frequency
divider (typically the (AXI or SHwy) bus clock),
- "scif_clk" for the optional external clock source for the frequency
divider (SCIF_CLK).
Note: Each enabled SCIx UART should have an alias correctly numbered in the
"aliases" node.