From patchwork Thu Feb 28 13:25:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gareth Williams X-Patchwork-Id: 10833055 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 300A51390 for ; Thu, 28 Feb 2019 13:28:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1F0B62ECEA for ; Thu, 28 Feb 2019 13:28:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 138412ED2B; Thu, 28 Feb 2019 13:28:35 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 B71862ED03 for ; Thu, 28 Feb 2019 13:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726003AbfB1N2e (ORCPT ); Thu, 28 Feb 2019 08:28:34 -0500 Received: from relmlor1.renesas.com ([210.160.252.171]:4267 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731830AbfB1N2e (ORCPT ); Thu, 28 Feb 2019 08:28:34 -0500 X-IronPort-AV: E=Sophos;i="5.58,423,1544454000"; d="scan'208";a="9122354" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 28 Feb 2019 22:28:31 +0900 Received: from renesas-VirtualBox.ree.adwin.renesas.com (unknown [10.226.37.56]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 9295343DA3C6; Thu, 28 Feb 2019 22:28:30 +0900 (JST) From: Gareth Williams To: Mark Brown Cc: Phil Edworthy , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Gareth Williams Subject: [PATCH 2/2] spi: dw: Add support for an optional interface clock Date: Thu, 28 Feb 2019 13:25:42 +0000 Message-Id: <1551360342-23981-3-git-send-email-gareth.williams.jx@renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551360342-23981-1-git-send-email-gareth.williams.jx@renesas.com> References: <1551360342-23981-1-git-send-email-gareth.williams.jx@renesas.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Phil Edworthy The Synopsys SSI Controller has an interface clock, but most SoCs hide this away. However, on some SoCs you need to explicity enable the interface clock in order to access the registers. Therefore, add support for an optional interface clock. Signed-off-by: Phil Edworthy Signed-off-by: Gareth Williams --- drivers/spi/spi-dw-mmio.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c index 4bd59a9..7cbc173 100644 --- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -30,6 +30,7 @@ struct dw_spi_mmio { struct dw_spi dws; struct clk *clk; + struct clk *pclk; void *priv; }; @@ -172,6 +173,14 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) if (ret) return ret; + /* Optional interface clock */ + dwsmmio->pclk = devm_clk_get_optional(&pdev->dev, "pclk"); + if (IS_ERR(dwsmmio->pclk)) + return PTR_ERR(dwsmmio->pclk); + ret = clk_prepare_enable(dwsmmio->pclk); + if (ret) + goto out_clk; + dws->bus_num = pdev->id; dws->max_freq = clk_get_rate(dwsmmio->clk); @@ -199,6 +208,8 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) return 0; out: + clk_disable_unprepare(dwsmmio->pclk); +out_clk: clk_disable_unprepare(dwsmmio->clk); return ret; } @@ -208,6 +219,7 @@ static int dw_spi_mmio_remove(struct platform_device *pdev) struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); dw_spi_remove_host(&dwsmmio->dws); + clk_disable_unprepare(dwsmmio->pclk); clk_disable_unprepare(dwsmmio->clk); return 0;