From patchwork Thu Mar 11 10:21:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 1451049 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Dx4k75vlwz9sWW for ; Thu, 11 Mar 2021 21:21:51 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232136AbhCKKVU (ORCPT ); Thu, 11 Mar 2021 05:21:20 -0500 Received: from mail-lj1-f170.google.com ([209.85.208.170]:42519 "EHLO mail-lj1-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232160AbhCKKVJ (ORCPT ); Thu, 11 Mar 2021 05:21:09 -0500 Received: by mail-lj1-f170.google.com with SMTP id 184so1430415ljf.9; Thu, 11 Mar 2021 02:21:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition; bh=x3Woc5oTtA4UJ933bToPpNvvRQm8/MIfrWRE83kOiK0=; b=Q/WGr3p6EXfEu0TVpnDjyIdLPhBn2HZCPyXVIKaITkjkg5J+MLuRcY1jXGcYyRGuiO /BPsqFfupFjDvSHkOcZLVvQurisnQ7KegyU+RJtvhquAp27F/qT+aS4+sXPI+FhwEGFC sfkfOKSVKP4KUlYUnD0huD80GNXEMFq03akh8ofc0HClGNYI6vcpdPbW7A0m9emNktL2 qW5geoRGsChOqlUEs9AHkxHM3Tq14AfWNE7W6HgCGCBLNIQD3H+OTls5KrImkjt7Kfe3 kg1YvP+uuvlDY5+HwcrtCQci72C+HmewsKXfo3517xJ0IVmEar/ob9NV6pNf7fnDPlBX RrDw== X-Gm-Message-State: AOAM530TGLtWAhaokD8huIlC7/lIaWTxUi6077Ku7cDXp3zxUPUw+EIT Eg6uChh402TyvVy4Jm3IZJQ= X-Google-Smtp-Source: ABdhPJxsHyurXplVQgaKOaFE3OSsqoI3lhXzhh4qJpYf/Png1ni70dAwb6zvpy68kQCbKO8bYKdDpQ== X-Received: by 2002:a05:651c:50b:: with SMTP id o11mr4588722ljp.97.1615458068118; Thu, 11 Mar 2021 02:21:08 -0800 (PST) Received: from localhost.localdomain (dc7vkhyyyyyyyyyyyyycy-3.rev.dnainternet.fi. [2001:14ba:16e2:8300::4]) by smtp.gmail.com with ESMTPSA id z28sm825835ljn.117.2021.03.11.02.21.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Mar 2021 02:21:07 -0800 (PST) Date: Thu, 11 Mar 2021 12:21:01 +0200 From: Matti Vaittinen To: matti.vaittinen@fi.rohmeurope.com, mazziesaccount@gmail.com Cc: Liam Girdwood , Mark Brown , Rob Herring , Matti Vaittinen , Andy Gross , Bjorn Andersson , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-power@fi.rohmeurope.com, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [RFC PATCH v3 0/7] Extend regulator notification support Message-ID: MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Extend regulator notification support This is an RFC series for getting feedback on extending the regulator notification and error flag support. Initial discussion on the topic can be found here: https://lore.kernel.org/lkml/6046836e22b8252983f08d5621c35ececb97820d.camel@fi.rohmeurope.com/ This series is built on top of the BD9576MUF support patch series v9 which is currently in MFD tree at immutable branch ib-mfd-watchdog-5.13 https://lore.kernel.org/lkml/cover.1615219345.git.matti.vaittinen@fi.rohmeurope.com/ (The series should apply without those patches but there is compile time dependency to definitions brought in at the last patch of the BD9576 series. This should be Ok though as there is a Kconfig dependency in BD9576 regulator driver) In a nutshell - the RFC adds: 1. WARNING level events/error flags. (Patch 2) Current regulator 'ERROR' event notifications for over/under voltage, over current and over temperature are used to indicate condition where monitored entity is so badly "off" that it actually indicates a hardware error which can not be recovered. The most typical hanling for that is believed to be a (graceful) system-shutdown. Here we add set of 'WARNING' level flags to allow sending notifications to consumers before things are 'that badly off' so that consumer drivers can implement recovery-actions. 2. Device-tree properties for specifying limit values. (Patches 1, 4) Add limits for above mentioned 'ERROR' and 'WARNING' levels (which send notifications to consumers) and also for a 'PROTECTION' level (which will be used to immediately shut-down the regulator(s) W/O informing consumer drivers. Typically implemented by hardware). Property parsing is implemented in regulator core which then calls callback operations for limit setting from the IC drivers. A warning is emitted if protection is requested by device tree but the underlying IC does not support configuring requested protection. 3. Helpers which can be registered by IC. (Patch 3) Target is to avoid implementing IRQ handling and IRQ storm protection in each IC driver. (Many of the ICs implementin these IRQs do not allow masking or acking the IRQ but keep the IRQ asserted for the whole duration of problem keeping the processor in IRQ handling loop). The helper was attempted to be done so it could be used to implement roughly same logic as is used in qcom-labibb regulator. This means amongst other things a safety shut-down if IC registers are not readable. Using these shut-down retry counters are optional. The idea is that the helper could be also used by simpler ICs which do not provide status register(s) which can be used to check if error is still active. ICs which do not have such status register can simply omit the 'renable' callback (and retry-counts etc) - and helper assumes the situation is Ok and re-enables IRQ after given time period. If problem persists the handler is ran again and another notification is sent - but at least the delay allows processor to avoid IRQ loop. Patch 6 takes this notification support in use at BD9576MUF. Patch 7 is related to MFD change which is not really related to the RFC here. It was added to this series in order to avoid potential conflicts. Changelog v3: Regulator core: - Fix dangling pointer access at regulator_irq_helper() stpmic1_regulator: - fix function prototype (compile error) bd9576-regulator: - Update over current limits to what was given in new data-sheet (REV00K) - Allow over-current monitoring without external FET. Set limits to values given in data-sheet (REV00K). Changelog v2: Generic: - rebase on v5.12-rc2 + BD9576 series - Split devm variant of delayed wq to own series Regulator framework: - Provide non devm variant of IRQ notification helpers - shorten dt-property names as suggested by Rob - unconditionally call map_event in IRQ handling and require it to be populated BD9576 regulators: - change the FET resistance property to micro-ohms - fix voltage computation in OC limit setting --- Matti Vaittinen (7): dt_bindings: Add protection limit properties regulator: add warning flags regulator: IRQ based event/error notification helpers regulator: add property parsing and callbacks to set protection limits dt-bindings: regulator: bd9576 add FET ON-resistance for OCW regulator: bd9576: Support error reporting regulator: bd9576: Fix the driver name in id table .../bindings/regulator/regulator.yaml | 82 ++ .../regulator/rohm,bd9576-regulator.yaml | 5 + drivers/regulator/Makefile | 2 +- drivers/regulator/bd9576-regulator.c | 1060 +++++++++++++++-- drivers/regulator/core.c | 146 ++- drivers/regulator/irq_helpers.c | 423 +++++++ drivers/regulator/of_regulator.c | 58 + drivers/regulator/qcom-labibb-regulator.c | 10 +- drivers/regulator/qcom_spmi-regulator.c | 6 +- drivers/regulator/stpmic1_regulator.c | 20 +- include/linux/regulator/consumer.h | 14 + include/linux/regulator/driver.h | 176 ++- include/linux/regulator/machine.h | 26 + 13 files changed, 1886 insertions(+), 142 deletions(-) create mode 100644 drivers/regulator/irq_helpers.c