tty: serial: 8250_mtk: Add support for bus clock

[sfrench/cifs-2.6.git] / Documentation / devicetree / bindings / serial / mtk-uart.txt

diff --git a/Documentation/devicetree/bindings/serial/mtk-uart.txt b/Documentation/devicetree/bindings/serial/mtk-uart.txt
index 44152261e5c5abf3484e7fba073795003dc5ed31..8d63f1da07aa041113a3a22e7b2c8b2b997fff99 100644 (file)
--- a/Documentation/devicetree/bindings/serial/mtk-uart.txt
+++ b/Documentation/devicetree/bindings/serial/mtk-uart.txt
@@ -14,7 +14,14 @@ Required properties:
 
 - interrupts: A single interrupt specifier.
 
-- clocks: Clock driving the hardware.
+- clocks : Must contain an entry for each entry in clock-names.
+  See ../clocks/clock-bindings.txt for details.
+- clock-names:
+  - "baud": The clock the baudrate is derived from
+  - "bus": The bus clock for register accesses (optional)
+
+For compatibility with older device trees an unnamed clock is used for the
+baud clock if the baudclk does not exist. Do not use this for new designs.
 
 Example:
 
@@ -22,5 +29,6 @@ Example:
                compatible = "mediatek,mt6589-uart", "mediatek,mt6577-uart";
                reg = <0x11006000 0x400>;
                interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_LOW>;
-               clocks = <&uart_clk>;
+               clocks = <&uart_clk>, <&bus_clk>;
+               clock-names = "baud", "bus";
        };