From patchwork Mon Feb 27 22:14:25 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Tull X-Patchwork-Id: 9594347 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 91820604A2 for ; Mon, 27 Feb 2017 22:17:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 819FD28179 for ; Mon, 27 Feb 2017 22:17:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7395828492; Mon, 27 Feb 2017 22:17:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 02CA928179 for ; Mon, 27 Feb 2017 22:17:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751702AbdB0WPb (ORCPT ); Mon, 27 Feb 2017 17:15:31 -0500 Received: from mail.kernel.org ([198.145.29.136]:54762 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751548AbdB0WOo (ORCPT ); Mon, 27 Feb 2017 17:14:44 -0500 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9835F202F8; Mon, 27 Feb 2017 22:14:40 +0000 (UTC) Received: from localhost.localdomain (unknown [192.55.54.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2160B20303; Mon, 27 Feb 2017 22:14:39 +0000 (UTC) From: Alan Tull To: Greg Kroah-Hartman Cc: Moritz Fischer , Alan Tull , linux-kernel@vger.kernel.org, linux-fpga@vger.kernel.org, Joel Holdsworth Subject: [PATCH 4/5] Documentation: Add binding document for Lattice iCE40 FPGA manager Date: Mon, 27 Feb 2017 16:14:25 -0600 Message-Id: <20170227221426.4176-5-atull@kernel.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170227221426.4176-1-atull@kernel.org> References: <20170227221426.4176-1-atull@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-fpga-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Joel Holdsworth This adds documentation of the device tree bindings of the Lattice iCE40 FPGA driver for the FPGA manager framework. Signed-off-by: Joel Holdsworth Acked-by: Rob Herring Acked-by: Alan Tull Acked-by: Moritz Fischer Acked-by: Marek Vasut --- .../bindings/fpga/lattice-ice40-fpga-mgr.txt | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt diff --git a/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt b/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt new file mode 100644 index 0000000..4dc4124 --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/lattice-ice40-fpga-mgr.txt @@ -0,0 +1,21 @@ +Lattice iCE40 FPGA Manager + +Required properties: +- compatible: Should contain "lattice,ice40-fpga-mgr" +- reg: SPI chip select +- spi-max-frequency: Maximum SPI frequency (>=1000000, <=25000000) +- cdone-gpios: GPIO input connected to CDONE pin +- reset-gpios: Active-low GPIO output connected to CRESET_B pin. Note + that unless the GPIO is held low during startup, the + FPGA will enter Master SPI mode and drive SCK with a + clock signal potentially jamming other devices on the + bus until the firmware is loaded. + +Example: + fpga: fpga@0 { + compatible = "lattice,ice40-fpga-mgr"; + reg = <0>; + spi-max-frequency = <1000000>; + cdone-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>; + reset-gpios = <&gpio 22 GPIO_ACTIVE_LOW>; + };