From patchwork Wed May 27 20:41:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dinh Nguyen X-Patchwork-Id: 214524 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 58FE2C433E1 for ; Wed, 27 May 2020 20:41:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30A0C207BC for ; Wed, 27 May 2020 20:41:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590612107; bh=Ug71YAZsoGA3BQn8dQLhYeUE2MzjpBSD/D+UvGQWqNQ=; h=From:To:Cc:Subject:Date:List-ID:From; b=Q9Bn0+WsR5PXrIG7PXnHt+X7j2qVIBIm27GELh9p27kUeHW8/gjXdVYCtdWko/2I9 AisaeeT1+whyaVJJh9HMr/JqvW14QnZFPadk2Za/0vcrHSlRQY0bwPQrsx3ExICyvT zQYmsb/wTt8BeCjySP0aqwcORpKZb+vl8dS0PnRI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728019AbgE0Ulk (ORCPT ); Wed, 27 May 2020 16:41:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:53222 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726222AbgE0Ulj (ORCPT ); Wed, 27 May 2020 16:41:39 -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 33865207BC; Wed, 27 May 2020 20:41:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590612099; bh=Ug71YAZsoGA3BQn8dQLhYeUE2MzjpBSD/D+UvGQWqNQ=; h=From:To:Cc:Subject:Date:From; b=s8U14Lq+ZQ49gdWC4LMdi4yECEVGzlh/JFFPH9QDfhmMdEFvFV47p0RalFhdNJeRB nZvNfyTns3VXFaL34+u46RbJQQaNU//Wy7BRyHA4G31W4BLhsWAIBo3Su9qBFF475F 6pEAvy3lnwL/apVhodsx9Gj1FHf18jN3IaaOCTSI= From: Dinh Nguyen To: linux-kernel@vger.kernel.org Cc: dinguyen@kernel.org, devicetree@vger.kernel.org, broonie@kernel.org, robh+dt@kernel.org, linux-spi@vger.kernel.org, Sergey.Semin@baikalelectronics.ru, fancer.lancer@gmail.com, andriy.shevchenko@linux.intel.com, lars.povlsen@microchip.com, Liang Jin J Subject: [PATCHv3 1/2] spi: dw: add reset control Date: Wed, 27 May 2020 15:41:09 -0500 Message-Id: <20200527204110.25676-1-dinguyen@kernel.org> X-Mailer: git-send-email 2.17.1 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Add mechanism to get the reset control and deassert it in order to bring the IP out of reset. Signed-off-by: Liang Jin J Signed-off-by: Dinh Nguyen --- v3: allow for other failures remove tab for rstc reset_control v2: use _get_optional_exclusive put IP back into reset if there was an error in probe function --- drivers/spi/spi-dw-mmio.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c index 384a3ab6dc2d..1e921c40d79b 100644 --- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "spi-dw.h" @@ -30,6 +31,7 @@ struct dw_spi_mmio { struct clk *clk; struct clk *pclk; void *priv; + struct reset_control *rstc; }; #define MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24 @@ -175,6 +177,14 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) if (ret) goto out_clk; + /* find an optional reset controller */ + dwsmmio->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, "spi"); + if (IS_ERR(dwsmmio->rstc)) { + ret = PTR_ERR(dwsmmio->rstc); + goto out_clk; + } + reset_control_deassert(dwsmmio->rstc); + dws->bus_num = pdev->id; dws->max_freq = clk_get_rate(dwsmmio->clk); @@ -208,6 +218,8 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) clk_disable_unprepare(dwsmmio->pclk); out_clk: clk_disable_unprepare(dwsmmio->clk); + reset_control_assert(dwsmmio->rstc); + return ret; } @@ -219,6 +231,7 @@ static int dw_spi_mmio_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); clk_disable_unprepare(dwsmmio->pclk); clk_disable_unprepare(dwsmmio->clk); + reset_control_assert(dwsmmio->rstc); return 0; }