From patchwork Tue Oct 3 05:19:22 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Raghavendra, Vignesh" X-Patchwork-Id: 820751 X-Patchwork-Delegate: cyrille.pitchen@atmel.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.infradead.org (client-ip=65.50.211.133; helo=bombadil.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="PDgz27kD"; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ti.com header.i=@ti.com header.b="m7NlZ0HZ"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3y5nfY128sz9t2x for ; Tue, 3 Oct 2017 16:29:57 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=iezXROWR6dI1BnHf5HknfBwzeReNiqPEYOGMZZH3Zxo=; b=PDgz27kD/Qwe23 xQTsQFty+/mYhjSE7q5StYHsIkQ0pxjoDpAnizcTMybrJVIFpgv1rJa5960ZQWMW8dmF0azkwEET/ YnhCQpx0uJq7jDS3RMx3Jwrc21ZmGczXQ/sOOYUqPAJDoKzJdOlQtgLApEXJWh1em2eIrGP5QZ2e4 cu9Dvpl/qcv0K8BfTb+T1ywckQxp1xDJr0zVncH8zOkIg0b4zYWQ24K6qoUnuK84Cl2biKBXBAn3M 926PZZOXU6HnQYpsHWEnF5WnK2NDfFNxNEfU8SA02Nc66efMDntP6AJpsgcuNK0DdMBef4ewBqf9S gjYTI5OOVK/+EQ4NZ68w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dzFmC-00057r-9t; Tue, 03 Oct 2017 05:29:52 +0000 Received: from fllnx209.ext.ti.com ([198.47.19.16]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dzFdd-0006vY-UQ; Tue, 03 Oct 2017 05:22:00 +0000 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by fllnx209.ext.ti.com (8.15.1/8.15.1) with ESMTP id v935JIa8028695; Tue, 3 Oct 2017 00:19:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1507007958; bh=uI+4+QRwxXE07v/9ifxsyixDo7u2QnF00OF4Wf40I3o=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=m7NlZ0HZ4+KLdswg43KczaHlo9769iGnkp6ZKiQuA0wtXT2JPk9zQBEvMn6t9C1h2 KV0nGkHbCtajTYePwdMMWCTh79fGp91/m7V12gVcRU4xlqGBI6kbxRLHsvp9xtHGIz jGM28HLV7aRiaaBeYViQOvEjQiZBApfbYad2tICg= Received: from DLEE114.ent.ti.com (dlee114.ent.ti.com [157.170.170.25]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id v935JDxr011076; Tue, 3 Oct 2017 00:19:13 -0500 Received: from DLEE104.ent.ti.com (157.170.170.34) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.845.34; Tue, 3 Oct 2017 00:19:13 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.845.34 via Frontend Transport; Tue, 3 Oct 2017 00:19:13 -0500 Received: from a0132425.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id v935IxHf003069; Tue, 3 Oct 2017 00:19:10 -0500 From: Vignesh R To: Marek Vasut , Cyrille Pitchen Subject: [PATCH v4 3/6] mtd: spi-nor: cadence-quadspi: Add new binding to enable loop-back circuit Date: Tue, 3 Oct 2017 10:49:22 +0530 Message-ID: <20171003051925.8821-4-vigneshr@ti.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171003051925.8821-1-vigneshr@ti.com> References: <20171003051925.8821-1-vigneshr@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171002_222103_117359_6EAA72D0 X-CRM114-Status: UNSURE ( 8.14 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.0 (--) X-Spam-Report: SpamAssassin version 3.4.1 on bombadil.infradead.org summary: Content analysis details: (-2.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [198.47.19.16 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Boris Brezillon , Vignesh R , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring , linux-mtd@lists.infradead.org, Brian Norris , David Woodhouse , linux-arm-kernel Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Cadence QSPI IP has a adapted loop-back circuit which can be enabled by setting BYPASS field to 0 in READCAPTURE register. It enables use of QSPI return clock to latch the data rather than the internal QSPI reference clock. For high speed operations, adapted loop-back circuit using QSPI return clock helps to increase data valid window. Add DT parameter cdns,rclk-en to help enable adapted loop-back circuit for boards which do have QSPI return clock provided. Update binding documentation for the same. Signed-off-by: Vignesh R Acked-by: Rob Herring --- Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt index 7dbe3bd9ac56..bb2075df9b38 100644 --- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt +++ b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt @@ -16,6 +16,9 @@ Required properties: Optional properties: - cdns,is-decoded-cs : Flag to indicate whether decoder is used or not. +- cdns,rclk-en : Flag to indicate that QSPI return clock is used to latch + the read data rather than the QSPI clock. Make sure that QSPI return + clock is populated on the board before using this property. Optional subnodes: Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional