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 D8B94C433FE for ; Mon, 17 Jan 2022 16:35:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241094AbiAQQfD (ORCPT ); Mon, 17 Jan 2022 11:35:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235274AbiAQQfB (ORCPT ); Mon, 17 Jan 2022 11:35:01 -0500 Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A3CBC061574; Mon, 17 Jan 2022 08:35:01 -0800 (PST) Received: by mail-ot1-x333.google.com with SMTP id c3-20020a9d6c83000000b00590b9c8819aso20504309otr.6; Mon, 17 Jan 2022 08:35:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:subject:to:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=p3gG/uGYcRlUGoPgDwXdMzkPcoyd1UeEICXKBe487oM=; b=QiVDp2IE56rYB7csRiMySFukCBTP+2HJDXPgVrULlTGDurbgfYRVsgJVDGkwrv+dEH box9Jqwyqwv2E5SzxMqdmLPxUpnBaDyTs1F1N5Iv/PwqXw/S38HYSJ+kdEmBp68Haq/E OimQIKUfNV/ZOl+AQhZgkcK4yHI3CbE8+OTmiWnkacb6jml2tL8pY9P7UWIh32gxGoC1 d4VfMxAEy1roKPgtQU1VQiPesqaio0SmD5f9XBNbXSX2QgKVyHlXkPWcowddnlZqCPJy ouuveDStvDjunnXBUDqcnrPPeLFJIcBJSFzVMqFbT2lnHvLHM736O/QAKf8r0xYQvR0t dYrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:subject:to:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=p3gG/uGYcRlUGoPgDwXdMzkPcoyd1UeEICXKBe487oM=; b=behSu8RlbB3gIu4S9p30mDv/AvhUC9Xr+7BOVwvR45LoyZbpX35LJDfd5rC+NylO1l 3CoejWpyFa+EPuhqdc7d5QDCgzhR4XnuWXspuE47NrvimlWwJxvwLbUjfGxA82NSLBmh f0z0VtEoNQunClozqUPZD8LoTc8qmWVA0E+4HBGHrK7/cNi3hL4L2j0efKpn0zZYyv/U xg/9H4+vJrdPm85+Qrgk9eoLNtAqJ+fNknCufmJdXdzTGmG0t14LpYFP3kKM5NT9iiyT 9/70UnFl0+X8mYX2sQHpka9ccMZ3lmi2WzDY0pKa2CmExpOJF2Xd582HMa60CfVo+btc 5YuA== X-Gm-Message-State: AOAM531JPChFthqkhiUYvNM7XO9d1T5n4MnUqV4R5H2Htntscvdm39E4 MxkBRKMj5qIumvOXz+xES6o= X-Google-Smtp-Source: ABdhPJyK0Irotkr18SoI6ww//ipgY/CYXIrn7ww3l9mNRiGWugmMTHvzxGIOeJHYzS5QUnUYe/zIoQ== X-Received: by 2002:a05:6830:4391:: with SMTP id s17mr17003236otv.108.1642437300631; Mon, 17 Jan 2022 08:35:00 -0800 (PST) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id f7sm5969418oti.35.2022.01.17.08.34.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Jan 2022 08:34:59 -0800 (PST) Sender: Guenter Roeck Subject: Re: Missing ARM TWD Watchdog driver? To: Boris Lysov , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20220117190112.2b2c2f53@pc> From: Guenter Roeck Message-ID: <60dceae6-5c7c-9f2d-9fcb-5e849f1d8ce5@roeck-us.net> Date: Mon, 17 Jan 2022 08:34:57 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20220117190112.2b2c2f53@pc> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/17/22 8:01 AM, Boris Lysov wrote: > Hello everyone, > > I stumbled upon the ARM TWD Watchdog driver which seems to be missing (or I'm > just blind). > > As per commit a33f5c380c4bd3fa5278d690421b72052456d9fe ("Merge tag > 'xfs-5.17-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux"), multiple > device trees declare usage of arm-twd: > > arch/arm/boot/dts/arm-realview-eb-mp.dtsi > arch/arm/boot/dts/arm-realview-pb11mp.dts > arch/arm/boot/dts/arm-realview-pbx-a9.dts > arch/arm/boot/dts/bcm5301x.dtsi > arch/arm/boot/dts/bcm63138.dtsi > arch/arm/boot/dts/bcm-hr2.dtsi > arch/arm/boot/dts/bcm-nsp.dtsi > arch/arm/boot/dts/berlin2cd.dtsi > arch/arm/boot/dts/highbank.dts > arch/arm/boot/dts/mmp3.dtsi > arch/arm/boot/dts/owl-s500.dtsi > arch/arm/boot/dts/spear13xx.dtsi > arch/arm/boot/dts/ste-dbx5x0.dtsi > arch/arm/boot/dts/vexpress-v2p-ca5s.dts > arch/arm/boot/dts/vexpress-v2p-ca9.dts > > and it is documented in > Documentation/devicetree/bindings/watchdog/arm,twd-wdt.yaml > > However I could not find the driver itself. I tried running case-insensitive > grep and ripgrep to no avail. Does this driver actually exist? Is it gone? > I may be missing it, but I do not see any evidence that it ever existed. Guenter