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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B352C77B73 for ; Fri, 26 May 2023 15:48:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243926AbjEZPsg (ORCPT ); Fri, 26 May 2023 11:48:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229629AbjEZPsf (ORCPT ); Fri, 26 May 2023 11:48:35 -0400 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AAF0E10A for ; Fri, 26 May 2023 08:48:32 -0700 (PDT) Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34QCqbGr012829; Fri, 26 May 2023 16:32:24 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=message-id : date : mime-version : subject : to : cc : references : from : in-reply-to : content-type : content-transfer-encoding; s=selector1; bh=6fv5eAOiW2wiRakUyl9v3Jczu/kwUHotAmcTf9pPFCo=; b=mql1C23d9blvEh9Pj43Kq2ZpBq26QsY1S/QL3seDXT4+e9V61TMbIZ7o+qJW7A2XIMst NK4yrUC+NBiLIox1nUcUSdqYnTiLWyw0C7g0ptGPHZ/3fBBFoCqIHqVISAGAM1F88Vj4 zghcrhZO4W3P276Xw1Ms0QjIn0wbAH0hQ13aSNSBmJBzJZIccecYybqdFejntiAOz3jQ wne8nLtjIVVp/xFcmJ89Alfg5aYCMPyMVjSOWjHCyI2CFS5YHoySdIHNrdFqf+luKibz 1HGbkAndQ/nVETwG4oG4x2ABZA8bWomjJL7Ki9PWu4RcSC1qvAjjo0WL6094OX/7Wthr NA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3qt39u2403-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 26 May 2023 16:32:24 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 9F42F10002A; Fri, 26 May 2023 16:32:23 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 8F7ED23152C; Fri, 26 May 2023 16:32:23 +0200 (CEST) Received: from [10.201.21.93] (10.201.21.93) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Fri, 26 May 2023 16:32:23 +0200 Message-ID: <6772577e-9d7d-13ad-3c35-7da57d1e8c68@foss.st.com> Date: Fri, 26 May 2023 16:32:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v2 3/3] ARM: dts: stm32: Add nvmem-syscon node to TAMP to expose boot count on DHSOM Content-Language: en-US To: Marek Vasut , CC: Conor Dooley , Krzysztof Kozlowski , Maxime Coquelin , Rob Herring , Srinivas Kandagatla , , , References: <20230517152513.27922-1-marex@denx.de> <20230517152513.27922-3-marex@denx.de> From: Alexandre TORGUE In-Reply-To: <20230517152513.27922-3-marex@denx.de> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.201.21.93] X-ClientProxiedBy: EQNCAS1NODE3.st.com (10.75.129.80) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-26_05,2023-05-25_03,2023-05-22_02 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 5/17/23 17:25, Marek Vasut wrote: > Add nvmem-syscon subnode to expose TAMP_BKPxR register 19 to user space. > This register contains U-Boot boot counter, by exposing it to user space > the user space can reset the boot counter. > > Read access example: > " > $ hexdump -vC /sys/bus/nvmem/devices/5c00a000.tamp\:nvmem0/nvmem > 00000000 0c 00 c4 b0 > " > > Signed-off-by: Marek Vasut > --- > Cc: Alexandre Torgue > Cc: Conor Dooley > Cc: Krzysztof Kozlowski > Cc: Marek Vasut > Cc: Maxime Coquelin > Cc: Rob Herring > Cc: Srinivas Kandagatla > Cc: devicetree@vger.kernel.org > Cc: kernel@dh-electronics.com > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-stm32@st-md-mailman.stormreply.com > --- > V2: No change > --- > arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi | 11 +++++++++++ > arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi | 11 +++++++++++ > 2 files changed, 22 insertions(+) > > diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi > index 74735552f4803..b2557bb718f52 100644 > --- a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi > +++ b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi > @@ -537,6 +537,17 @@ &sdmmc3 { > status = "okay"; > }; > > +&tamp { > + #address-cells = <1>; > + #size-cells = <1>; > + > + /* Boot counter */ > + nvmem { nvmem@14c ? > + compatible = "nvmem-syscon"; > + reg = <0x14c 0x4>; > + }; > +}; > + > &uart4 { > pinctrl-names = "default"; > pinctrl-0 = <&uart4_pins_a>; > diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi > index bba19f21e5277..864960387e634 100644 > --- a/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi > +++ b/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi > @@ -269,3 +269,14 @@ &rng1 { > &rtc { > status = "okay"; > }; > + > +&tamp { > + #address-cells = <1>; > + #size-cells = <1>; > + > + /* Boot counter */ > + nvmem { nvmem@14c ? > + compatible = "nvmem-syscon"; > + reg = <0x14c 0x4>; > + }; > +};