From patchwork Mon Jan 29 17:05:19 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lionel Debieve X-Patchwork-Id: 10190133 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 02B5160388 for ; Mon, 29 Jan 2018 17:06:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 05B2A285EC for ; Mon, 29 Jan 2018 17:06:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EBF08285EA; Mon, 29 Jan 2018 17:06:58 +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 ABE77285EA for ; Mon, 29 Jan 2018 17:06:57 +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=oZAK2jMJFi3xmyj+gsxFR20R/JC9SE1OjEbSqiO+xS0=; b=Xihz3uYOekuV/9 ptnV8mX8cdjnwcn2ImSNNtYcF3hxnHXe1wuzhQk08yOOVxxrahy4UMv+8eL6BKr+YYP8LIpng2M0+ I6HT895MHFTaaa/h6c7oFlaXr4XhmbeR2ia7iLJKC0VsoRi8wKXqn48Z1D5mJh50plKU6rtWWr1T8 cnGf+KIkf40mylROEmLwWhsMjwhUIdWEiR5M3rOOgRzCw8+6E77tCEx6tp2Oyrkw2w+Vtd/LZdM6D DrD23n18NCe8c+gl7Xfp4mY0sgMAEEVMTpf/kYObffiaaMV20PFxUWPgMiviO0hiQZ9WFSdmo2QeP 2e+MByk7FpPQhir2IjDA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1egCtR-0003xx-Ds; Mon, 29 Jan 2018 17:06:53 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93] helo=mx07-00178001.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1egCtC-0003l6-E7 for linux-arm-kernel@lists.infradead.org; Mon, 29 Jan 2018 17:06:40 +0000 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx08-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id w0TH3m46015523; Mon, 29 Jan 2018 18:06:21 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2ft0t72nvt-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 29 Jan 2018 18:06:21 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 5A1D331; Mon, 29 Jan 2018 17:06:20 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag7node2.st.com [10.75.127.20]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 2F6C62D51; Mon, 29 Jan 2018 17:06:20 +0000 (GMT) Received: from lmecxl0602.lme.st.com (10.75.127.48) by SFHDAG7NODE2.st.com (10.75.127.20) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Mon, 29 Jan 2018 18:06:19 +0100 From: Lionel Debieve To: Matt Mackall , Herbert Xu , Arnd Bergmann , Greg Kroah-Hartman , Maxime Coquelin , Alexandre Torgue , , , Subject: [PATCH 3/5] hwrng: stm32 - allow disable clock error detection Date: Mon, 29 Jan 2018 18:05:19 +0100 Message-ID: <20180129170521.1862-4-lionel.debieve@st.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180129170521.1862-1-lionel.debieve@st.com> References: <20180129170521.1862-1-lionel.debieve@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.48] X-ClientProxiedBy: SFHDAG8NODE3.st.com (10.75.127.24) To SFHDAG7NODE2.st.com (10.75.127.20) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-01-29_08:, , signatures=0 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: Benjamin Gaignard , Ludovic Barre 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 Add a new property that allow to disable the clock error detection which is required when the clock source selected is out of specification (which is not mandatory). Signed-off-by: Lionel Debieve --- drivers/char/hw_random/stm32-rng.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 83c695938a2d..709a8d061be3 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -26,6 +26,7 @@ #define RNG_CR 0x00 #define RNG_CR_RNGEN BIT(2) +#define RNG_CR_CED BIT(5) #define RNG_SR 0x04 #define RNG_SR_SEIS BIT(6) @@ -48,6 +49,7 @@ struct stm32_rng_private { void __iomem *base; struct clk *clk; struct reset_control *rst; + bool ced; }; static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) @@ -101,7 +103,11 @@ static int stm32_rng_init(struct hwrng *rng) if (err) return err; - writel_relaxed(RNG_CR_RNGEN, priv->base + RNG_CR); + if (priv->ced) + writel_relaxed(RNG_CR_RNGEN, priv->base + RNG_CR); + else + writel_relaxed(RNG_CR_RNGEN | RNG_CR_CED, + priv->base + RNG_CR); /* clear error indicators */ writel_relaxed(0, priv->base + RNG_SR); @@ -149,6 +155,8 @@ static int stm32_rng_probe(struct platform_device *ofdev) reset_control_deassert(priv->rst); } + priv->ced = of_property_read_bool(np, "clock-error-detect"); + dev_set_drvdata(dev, priv); priv->rng.name = dev_driver_string(dev),