Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751827AbdFIJwG (ORCPT ); Fri, 9 Jun 2017 05:52:06 -0400 Received: from mail-wm0-f51.google.com ([74.125.82.51]:36576 "EHLO mail-wm0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751643AbdFIJt3 (ORCPT ); Fri, 9 Jun 2017 05:49:29 -0400 From: Neil Armstrong To: gregkh@linuxfoundation.org, khilman@baylibre.com Cc: Helmut Klein , linux-serial@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, 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> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1497001756-942-1-git-send-email-narmstrong@baylibre.com> References: <1497001756-942-1-git-send-email-narmstrong@baylibre.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2288 Lines: 57 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