From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29E40C10F0E for ; Tue, 9 Apr 2019 15:38:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEAFD21473 for ; Tue, 9 Apr 2019 15:38:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554824295; bh=n3oVS0RGbjjZsrRYWn3vaYYlmTt0k55e3PTjUh0A4Dg=; h=From:To:Cc:Subject:Date:List-ID:From; b=XtBGtW4yT0mVdHDs1z6ryVtj0b4Eqi1GKhm8Uwe8y6IIrxBM84q7lfpHz0kulaaBP noul0Oc/LomRfIxmtzNZ4qiKgQQmKkHHTrrx4cfUgPBdpTEv6Tc3Vg2f71XetXjSbw AbbuO18Owwv9bSryjQIxgliX2r5Hl5/biVLhm9Bs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726686AbfDIPiN (ORCPT ); Tue, 9 Apr 2019 11:38:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:34272 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726372AbfDIPiN (ORCPT ); Tue, 9 Apr 2019 11:38:13 -0400 Received: from localhost.localdomain (cpe-70-114-128-244.austin.res.rr.com [70.114.128.244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0DCF320883; Tue, 9 Apr 2019 15:38:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554824292; bh=n3oVS0RGbjjZsrRYWn3vaYYlmTt0k55e3PTjUh0A4Dg=; h=From:To:Cc:Subject:Date:From; b=lfILR6dYprpWXuEMrFtFDySwJdS/HYg1K5by6jxyCu2SKbpXdzElpUCTXq8cccvrX 1DZ9MU8rYb1xMqZQGDHbz2IJ7X5258nEnzg8sAnxDzM/XvnKrgLaPsoScBomRAILbu FAnu6GQUIIqHQvrj1T2C7Yq62NRx55ebtm7I7/Z0= From: Dinh Nguyen To: linux-mtd@lists.infradead.org Cc: dinguyen@kernel.org, marex@denx.de, tudor.ambarus@microchip.com, dwmw2@infradead.org, computersforpeace@gmail.com, bbrezillon@kernel.org, vigneshr@ti.com, linux-kernel@vger.kernel.org, Tien-Fong Chee Subject: [PATCHv2] mtd: spi-nor: cadence-quadspi: add reset control Date: Tue, 9 Apr 2019 10:38:01 -0500 Message-Id: <20190409153801.6941-1-dinguyen@kernel.org> X-Mailer: git-send-email 2.20.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Get the reset control for the QSPI controller and bring it out of reset. Suggested-by: Tien-Fong Chee Signed-off-by: Dinh Nguyen --- v2: use devm_reset_control_get_optional_exclusive print an error message return -EPROBE_DEFER --- drivers/mtd/spi-nor/cadence-quadspi.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c index 792628750eec..c548567adcf0 100644 --- a/drivers/mtd/spi-nor/cadence-quadspi.c +++ b/drivers/mtd/spi-nor/cadence-quadspi.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -1336,6 +1337,7 @@ static int cqspi_probe(struct platform_device *pdev) struct cqspi_st *cqspi; struct resource *res; struct resource *res_ahb; + struct reset_control *rstc; const struct cqspi_driver_platdata *ddata; int ret; int irq; @@ -1362,6 +1364,18 @@ static int cqspi_probe(struct platform_device *pdev) return PTR_ERR(cqspi->clk); } + /* Obtain QSPI reset control */ + rstc = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(rstc)) { + dev_err(dev, "Cannot get QSPI reset.\n"); + if (PTR_ERR(rstc) == -EPROBE_DEFER) + return -EPROBE_DEFER; + } else { + reset_control_assert(rstc); + udelay(1); + reset_control_deassert(rstc); + } + /* Obtain and remap controller address. */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); cqspi->iobase = devm_ioremap_resource(dev, res); -- 2.20.0