Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934980AbcJFUel (ORCPT ); Thu, 6 Oct 2016 16:34:41 -0400 Received: from mail-pf0-f196.google.com ([209.85.192.196]:34615 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933542AbcJFUe3 (ORCPT ); Thu, 6 Oct 2016 16:34:29 -0400 From: Joshua Clayton To: Alan Tull , Moritz Fischer Cc: Rob Herring , Mark Rutland , Shawn Guo , Sascha Hauer , Fabio Estevam , Russell King , Joshua Clayton , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/3] doc: dt: add cyclone-spi binding document Date: Thu, 6 Oct 2016 13:34:18 -0700 Message-Id: <8d89e70475e8e1c3ce5117a0367c8444c11c61e3.1475783742.git.stillcompiling@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <4b4432c04b4ea92a2af814e3d7866c33f2eb12ea.1475783742.git.stillcompiling@gmail.com> References: <4b4432c04b4ea92a2af814e3d7866c33f2eb12ea.1475783742.git.stillcompiling@gmail.com> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1473 Lines: 39 Describe a cyclonespi devicetree entry, required features Signed-off-by: Joshua Clayton --- .../bindings/fpga/cyclone-spi-fpga-mgr.txt | 23 ++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/cyclone-spi-fpga-mgr.txt diff --git a/Documentation/devicetree/bindings/fpga/cyclone-spi-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/cyclone-spi-fpga-mgr.txt new file mode 100644 index 0000000..8de34db --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/cyclone-spi-fpga-mgr.txt @@ -0,0 +1,23 @@ +Altera SOCFPGA FPGA Manager + +Altera cyclone 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 : should contain "altr,cyclonespi-fpga-mgr" +- reg : spi slave id of the fpga +- reset-gpio : reset pin (referred to as nCONFIG in the cyclone manual) +- status-gpio : status pin (referred to as nSTATUS in the cyclone manual) + +Example: + fpga_spi: evi-fpga-spi@0 { + compatible = "altr,cyclonespi-fpga-mgr"; + spi-max-frequency = <20000000>; + reg = <0>; + reset-gpio = <&gpio4 9 GPIO_ACTIVE_HIGH>; + status-gpio = <&gpio4 11 GPIO_ACTIVE_HIGH>; + }; -- 2.7.4