From patchwork Tue Oct 3 05:19:23 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vignesh Raghavendra X-Patchwork-Id: 9981673 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 31CBF60375 for ; Tue, 3 Oct 2017 05:22:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 285802870F for ; Tue, 3 Oct 2017 05:22:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1D0A1288A2; Tue, 3 Oct 2017 05:22:14 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A823E2870F for ; Tue, 3 Oct 2017 05:22:12 +0000 (UTC) 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=fc/1P+Rg7aakFXRx+EMfLR11EH/FU5qnG1iL+004UOQ=; b=en6U0WI4IDIS5O +KYSxvZS+uTCGeZ3vX4R3egk+2nXuEpn4WtFmVvyCx0DLS5/cMNQNa02bRioAo0vsqeONxAEvw4gY 3Wvgznlgbbo2jTWUkkRaeUJDosUwo5+xqjWIboMRYKiVMBNpE9EYuxnwCgxSskq3AqAaa11xvj+7Q ImY7OSwotN7LozWEedqHPHudaPt7FO024AtCLOejOJ/lhhDJpQSdqDVkBXd7PKLZYiz7gwdyxPNLq BlPFy4TFc1KWWBaoBwCeCzAERejnbn0chCte8GXDu1Gzrhi+PhXylkFl3rx2ZTeFE1Bpz1C/93SjF UybjVK9QBxH3+P8zw+PA==; 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 1dzFeg-00089M-NX; Tue, 03 Oct 2017 05:22:06 +0000 Received: from lelnx194.ext.ti.com ([198.47.27.80]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dzFcj-000531-Om; Tue, 03 Oct 2017 05:20:11 +0000 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by lelnx194.ext.ti.com (8.15.1/8.15.1) with ESMTP id v935JHqs012413; Tue, 3 Oct 2017 00:19:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1507007957; bh=mQFeOCiu9cgTJ2OG/VxU6Otq/UKt6CwLGP+8OAlALlw=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=T5gz+1HTGzFPhx7KrlzkBfWZSTwD8/RQQY4uEbdwlLNKQb4SF55F0uUjQBCma/SMR 9J75JYXxEDeipYDBjBkPjefRY5dTN94WNtP7sIjWH6cpVwtinTKYQbEcYWrOtB/hgp sElDMBzKZ/OdIcLU0uhEO5EWY0fpNuqhn4l/IgI4= Received: from DLEE112.ent.ti.com (dlee112.ent.ti.com [157.170.170.23]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id v935JGAg025216; Tue, 3 Oct 2017 00:19:17 -0500 Received: from DLEE115.ent.ti.com (157.170.170.26) by DLEE112.ent.ti.com (157.170.170.23) 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 00:19:16 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DLEE115.ent.ti.com (157.170.170.26) 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 00:19:16 -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 v935IxHg003069; Tue, 3 Oct 2017 00:19:13 -0500 From: Vignesh R To: Marek Vasut , Cyrille Pitchen Subject: [PATCH v4 4/6] mtd: spi-nor: cadence-quadspi: Add support to enable loop-back clock circuit Date: Tue, 3 Oct 2017 10:49:23 +0530 Message-ID: <20171003051925.8821-5-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_222006_772013_6FE3EC52 X-CRM114-Status: UNSURE ( 9.84 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: 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-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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. Based on DT parameter cdns,rclk-en enable adapted loop-back circuit for boards which do have QSPI return clock provided. This patch also modifies cqspi_readdata_capture() function's bypass parameter to bool to match how its used in the function. Signed-off-by: Vignesh R --- drivers/mtd/spi-nor/cadence-quadspi.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c index 5cd5d6f7303f..d9629e8f4798 100644 --- a/drivers/mtd/spi-nor/cadence-quadspi.c +++ b/drivers/mtd/spi-nor/cadence-quadspi.c @@ -78,6 +78,7 @@ struct cqspi_st { bool is_decoded_cs; u32 fifo_depth; u32 fifo_width; + bool rclk_en; u32 trigger_address; u32 wr_delay; struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT]; @@ -788,7 +789,7 @@ static void cqspi_config_baudrate_div(struct cqspi_st *cqspi) } static void cqspi_readdata_capture(struct cqspi_st *cqspi, - const unsigned int bypass, + const bool bypass, const unsigned int delay) { void __iomem *reg_base = cqspi->iobase; @@ -852,7 +853,8 @@ static void cqspi_configure(struct spi_nor *nor) cqspi->sclk = sclk; cqspi_config_baudrate_div(cqspi); cqspi_delay(nor); - cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay); + cqspi_readdata_capture(cqspi, !cqspi->rclk_en, + f_pdata->read_delay); } if (switch_cs || switch_ck) @@ -1049,6 +1051,8 @@ static int cqspi_of_get_pdata(struct platform_device *pdev) return -ENXIO; } + cqspi->rclk_en = of_property_read_bool(np, "cdns,rclk-en"); + return 0; }