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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 B0425C28E82 for ; Wed, 3 Mar 2021 18:11:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A86564EE8 for ; Wed, 3 Mar 2021 18:11:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1386016AbhCCRdY convert rfc822-to-8bit (ORCPT ); Wed, 3 Mar 2021 12:33:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242741AbhCCNzm (ORCPT ); Wed, 3 Mar 2021 08:55:42 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72283C061221 for ; Wed, 3 Mar 2021 05:52:59 -0800 (PST) Received: from lupine.hi.pengutronix.de ([2001:67c:670:100:3ad5:47ff:feaf:1a17] helo=lupine) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lHRvJ-0005O2-TD; Wed, 03 Mar 2021 14:52:21 +0100 Received: from pza by lupine with local (Exim 4.92) (envelope-from ) id 1lHRvF-0004VL-ED; Wed, 03 Mar 2021 14:52:17 +0100 Message-ID: Subject: Re: [PATCH v4 2/2] hwrng: bcm2835: add reset support From: Philipp Zabel To: =?ISO-8859-1?Q?=C1lvaro_Fern=E1ndez?= Rojas , Matt Mackall , Herbert Xu , Rob Herring , Nicolas Saenz Julienne , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Mark Brown , Guenter Roeck , Bjorn Andersson , =?ISO-8859-1?Q?N=EDcolas?= "F. R. A. Prado" , Rikard Falkeborn , Stefan Wahren , linux-crypto@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Date: Wed, 03 Mar 2021 14:52:17 +0100 In-Reply-To: <20210224082230.29015-3-noltari@gmail.com> References: <20210223160131.29053-1-noltari@gmail.com> <20210224082230.29015-1-noltari@gmail.com> <20210224082230.29015-3-noltari@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT User-Agent: Evolution 3.30.5-1.1 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:3ad5:47ff:feaf:1a17 X-SA-Exim-Mail-From: p.zabel@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Álvaro, On Wed, 2021-02-24 at 09:22 +0100, Álvaro Fernández Rojas wrote: [...] > @@ -115,6 +121,8 @@ static void bcm2835_rng_cleanup(struct hwrng *rng) > /* disable rng hardware */ > rng_writel(priv, 0, RNG_CTRL); > > + reset_control_rearm(priv->reset); > + > if (!IS_ERR(priv->clk)) > clk_disable_unprepare(priv->clk); > } > @@ -159,6 +167,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev) > if (PTR_ERR(priv->clk) == -EPROBE_DEFER) > return -EPROBE_DEFER; > > + priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL); > + if (IS_ERR(priv->reset)) > + return PTR_ERR(priv->reset); > + > priv->rng.name = pdev->name; > priv->rng.init = bcm2835_rng_init; > priv->rng.read = bcm2835_rng_read; That doesn't seem right. reset_control_rearm() doesn't do anything if the reset control is exclusive. Either the reset control should be requested as shared, or the _rearm should be removed. regards Philipp