dt-bindings: serial: Add bindings for the Amlogic Meson UARTs

Add the documentation for the device tree binding of Amlogic Meson Serial UART.

Signed-off-by: Helmut Klein <hgkr.klein@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt
new file mode 100644 (file)
index 0000000..8ff65fa
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt
@@ -0,0 +1,38 @@
+Amlogic Meson SoC UART Serial Interface
+=======================================
+
+The Amlogic Meson SoC UART Serial Interface is present on a large range
+of SoCs, and can be present either in the "Always-On" power domain or the
+"Everything-Else" power domain.
+
+The particularity of the "Always-On" Serial Interface is that the hardware
+is active since power-on and does not need any clock gating and is usable
+as very early serial console.
+
+Required properties:
+- compatible : compatible: value should be different for each SoC family as :
+       - Meson6 : "amlogic,meson6-uart"
+       - Meson8 : "amlogic,meson8-uart"
+       - Meson8b : "amlogic,meson8b-uart"
+       - GX (GXBB, GXL, GXM) : "amlogic,meson-gx-uart"
+       eventually followed by : "amlogic,meson-ao-uart" if this UART interface
+       is in the "Always-On" power domain.
+- reg : offset and length of the register set for the device.
+- interrupts : identifier to the device interrupt
+- clocks : a list of phandle + clock-specifier pairs, one for each
+          entry in clock names.
+- clocks-names :
+   * "xtal" for external xtal clock identifier
+   * "pclk" for the bus core clock, either the clk81 clock or the gate clock
+   * "baud" for the source of the baudrate generator, can be either the xtal
+       or the pclk.
+
+e.g.
+uart_A: serial@84c0 {
+       compatible = "amlogic,meson-gx-uart";
+       reg = <0x0 0x84c0 0x0 0x14>;
+       interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;
+       /* Use xtal as baud rate clock source */
+       clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;
+       clock-names = "xtal", "pclk", "baud";
+};