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authorSascha Hauer <s.hauer@pengutronix.de>2015-04-27 08:49:57 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-06 22:27:03 +0200
commitc1c325d703d347d967242efb8fef6a1c91a31aac (patch)
tree3e9d7d7b7d2fe2f1ff0b4a163c68a42c34766fec /Documentation/devicetree
parent68e5fc4a255a7f453b8d156b89d1e37a0ad61465 (diff)
downloadop-kernel-dev-c1c325d703d347d967242efb8fef6a1c91a31aac.zip
op-kernel-dev-c1c325d703d347d967242efb8fef6a1c91a31aac.tar.gz
tty: serial: 8250_mtk: Add support for bus clock
The mtk 8250 needs two clocks, one for providing the baudrate and one that needs to be enabled for register accesses. The latter has not been supported, this patch adds support for it. It is optional for now since not all SoCs provide a bus clock. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/serial/mtk-uart.txt12
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/serial/mtk-uart.txt b/Documentation/devicetree/bindings/serial/mtk-uart.txt
index 4415226..8d63f1d 100644
--- 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";
};
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