From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Armstrong Subject: [PATCH v4 1/7] dt-bindings: serial: Add bindings for the Amlogic Meson UARTs Date: Fri, 9 Jun 2017 11:49:10 +0200 Message-ID: <1497001756-942-2-git-send-email-narmstrong@baylibre.com> References: <1497001756-942-1-git-send-email-narmstrong@baylibre.com> Return-path: In-Reply-To: <1497001756-942-1-git-send-email-narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org Cc: Helmut Klein , linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-amlogic-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Neil Armstrong List-Id: devicetree@vger.kernel.org From: Helmut Klein Add the documentation for the device tree binding of Amlogic Meson Serial UART. Signed-off-by: Helmut Klein Signed-off-by: Neil Armstrong --- .../bindings/serial/amlogic,meson-uart.txt | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt diff --git a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.txt new file mode 100644 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 = ; + /* Use xtal as baud rate clock source */ + clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>; + clock-names = "xtal", "pclk", "baud"; +}; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html