Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/serial/mtk-uart.txt b/Documentation/devicetree/bindings/serial/mtk-uart.txt
new file mode 100644
index 000000000..742cb4705
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/mtk-uart.txt
@@ -0,0 +1,42 @@
+* Mediatek Universal Asynchronous Receiver/Transmitter (UART)
+
+Required properties:
+- compatible should contain:
+  * "mediatek,mt2701-uart" for MT2701 compatible UARTS
+  * "mediatek,mt2712-uart" for MT2712 compatible UARTS
+  * "mediatek,mt6580-uart" for MT6580 compatible UARTS
+  * "mediatek,mt6582-uart" for MT6582 compatible UARTS
+  * "mediatek,mt6589-uart" for MT6589 compatible UARTS
+  * "mediatek,mt6755-uart" for MT6755 compatible UARTS
+  * "mediatek,mt6765-uart" for MT6765 compatible UARTS
+  * "mediatek,mt6795-uart" for MT6795 compatible UARTS
+  * "mediatek,mt6797-uart" for MT6797 compatible UARTS
+  * "mediatek,mt7622-uart" for MT7622 compatible UARTS
+  * "mediatek,mt7623-uart" for MT7623 compatible UARTS
+  * "mediatek,mt8127-uart" for MT8127 compatible UARTS
+  * "mediatek,mt8135-uart" for MT8135 compatible UARTS
+  * "mediatek,mt8173-uart" for MT8173 compatible UARTS
+  * "mediatek,mt6577-uart" for MT6577 and all of the above
+
+- reg: The base address of the UART register bank.
+
+- interrupts: A single interrupt specifier.
+
+- 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:
+
+	uart0: serial@11006000 {
+		compatible = "mediatek,mt6589-uart", "mediatek,mt6577-uart";
+		reg = <0x11006000 0x400>;
+		interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&uart_clk>, <&bus_clk>;
+		clock-names = "baud", "bus";
+	};