Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751859AbdFIWj5 (ORCPT ); Fri, 9 Jun 2017 18:39:57 -0400 Received: from mail-pg0-f65.google.com ([74.125.83.65]:35671 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751633AbdFIWjw (ORCPT ); Fri, 9 Jun 2017 18:39:52 -0400 From: Joshua Clayton To: Alan Tull , Moritz Fischer , Anatolij Gustschin , Bastian Stender , Shawn Guo , Joshua Clayton Cc: Rob Herring , Mark Rutland , Sascha Hauer , Fabio Estevam , Russell King , linux-fpga@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v13 2/6] doc: dt: document altera-passive-serial binding Date: Fri, 9 Jun 2017 15:39:35 -0700 Message-Id: <239fb9ad4848c96ddc944f99db811721653da95b.1497047816.git.stillcompiling@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> References: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> In-Reply-To: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> References: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1701 Lines: 46 Describe an altera-passive-serial devicetree entry, required features Signed-off-by: Joshua Clayton Acked-by: Rob Herring --- .../bindings/fpga/altera-passive-serial.txt | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/altera-passive-serial.txt diff --git a/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt b/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt new file mode 100644 index 000000000000..48478bc07e29 --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt @@ -0,0 +1,29 @@ +Altera Passive Serial SPI FPGA Manager + +Altera FPGAs support a method of loading the bitstream over what is +referred to as "passive serial". +The passive serial link is not technically SPI, and might require extra +circuits in order to play nicely with other SPI slaves on the same bus. + +See https://www.altera.com/literature/hb/cyc/cyc_c51013.pdf + +Required properties: +- compatible: Must be one of the following: + "altr,fpga-passive-serial", + "altr,fpga-arria10-passive-serial" +- reg: SPI chip select of the FPGA +- nconfig-gpios: config pin (referred to as nCONFIG in the manual) +- nstat-gpios: status pin (referred to as nSTATUS in the manual) + +Optional properties: +- confd-gpios: confd pin (referred to as CONF_DONE in the manual) + +Example: + fpga: fpga@0 { + compatible = "altr,fpga-passive-serial"; + spi-max-frequency = <20000000>; + reg = <0>; + nconfig-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>; + nstat-gpios = <&gpio4 11 GPIO_ACTIVE_LOW>; + confd-gpios = <&gpio4 12 GPIO_ACTIVE_LOW>; + }; -- 2.11.0