From patchwork Fri May 7 13:14:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hsin-Yi Wang X-Patchwork-Id: 12244583 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 B63D8C433ED for ; Fri, 7 May 2021 13:14:58 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 158C061466 for ; Fri, 7 May 2021 13:14:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 158C061466 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=7Vut1UKUgRt50oaNhb9e30kVFMKZ0MCRUva6lTHIYrc=; b=hUWckmvXa75olMgAl4jb62fVY vuIEZEFX4lGnhEsTbHXj6BlZajxaPmubCb0+bu2xKLInUkWeiTQm3qGRRkr/NHhZpM912qsP+SRsg GbHJqqLtlOzQ7aagZnXwM2ObzobN240Qqk5uLAjH59wdRUvv2e/muRiyRd8U8G69WVsL2yHDd5jeg UK45OSHWZHk5Cm8VmqKnyfrMirOOu01jWAsFpovCJKu9fiip2BJaQVd7JptLC5QGhG0twKRqNytdy ZE2SNyPIjmNcBQGrj7dGfKQCzyIOo2VoQOgkgfcT0zkThecfAAWFPBRQHcSv9hmkyIBuOLfnYLfFK BBWmwCqOg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lf0JU-0077sl-Tr; Fri, 07 May 2021 13:14:41 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lf0J8-0077pf-G7 for linux-mediatek@desiato.infradead.org; Fri, 07 May 2021 13:14:18 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=zc6/3/VfcHCcsyhsjpHk83+1mY6bLdnDzZw5bgOgDug=; b=3apxzaSIyrpm+vQ8ldjc5KyGyh PYOd+1KObWRxCpjMKekASM83cORauz2y1FCJ06ZO8lZCQZKwHj1UyyTnpYY/ab+K15fMu8YhOBDfm nNma0EyvM+JtZ69i/YPnWO5mBuBOvzuMlGwjp0rh9iZmtSCPESlP6Hjn3XuEBEBgqYVZzA0axmzU6 z6rZFiahIrpKoP21mP9NrJ9fjkc1Wb6w2et0FXxiJxRpaA+mwPMkhCg455VC1P0W9NeYk7zlItvG6 26JZOmu8WrDFUK6P86B4go07rPJlwNT+ITAYn1hgevbjpTBz/ckQ8DMwo0kdHhAR8x9ubXXvHYK8a V+6+0K0g==; Received: from mail-pl1-x62c.google.com ([2607:f8b0:4864:20::62c]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lf0J5-006sXb-MQ for linux-mediatek@lists.infradead.org; Fri, 07 May 2021 13:14:17 +0000 Received: by mail-pl1-x62c.google.com with SMTP id b3so5103407plg.11 for ; Fri, 07 May 2021 06:14:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=zc6/3/VfcHCcsyhsjpHk83+1mY6bLdnDzZw5bgOgDug=; b=POFBgKAPpYfOQn+zGMU4zVvD61ln1R7Iz0VNQU2NOPqLsRwHWA0+/KzHDjiO1lNzqv 4J6S2UVlB6iJlyJGqsqZpq3NIO/ApK6zBKw2VG/t8PDkBUxhKDxcGujl0t6c04E1nuLj vYdZiHUwIhNPWwUl2zdKlWd2cZwpgEih3zPOQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=zc6/3/VfcHCcsyhsjpHk83+1mY6bLdnDzZw5bgOgDug=; b=DJlZc0zBpOqHd/sloPQxay8s1ctWnj9zSpHyulE/m/LO8r4ZTknMT7KwSGSLHjbuTX wk/Oe0OrhRB23gjBEiNARFdhyS6JSdHkk0hWJj45mrdU5RupL3avN3bN+obsBzbZ//pO 2dERskITBugzwKkzTpilXB7n1so+W8ky5Vaw1raO0PIXh1bAUiH28KWULo23cVchtJxB 36MAxsIduJ7pb91MeUqFBnCom2nL+RBEKXon1huCXCWmN+OcaTmqCMZhxURxBYZwX0EG lM8bIGBdmExhlzEbU1a2gB+IyD4MpcoZ4dU/QlqN4mPCPMyxzuOuxpa4iIN38pOx3+Vd A6IA== X-Gm-Message-State: AOAM530IVkhelbVsRSFYN/49/IgJF0gW7xxoFSYWT0FB4904kTSqfcFf cbWJqaQQfOEADoJzaeq2y9MQUrY6nGKEVg== X-Google-Smtp-Source: ABdhPJxqT7U6uQjQoBNiFS/tGiuwtuAfj3Zop0aaTEvptjo8FjdlTzjrtlDJlNmeXJAXIlPVuDDk+Q== X-Received: by 2002:a17:90a:cc11:: with SMTP id b17mr10270349pju.119.1620393254578; Fri, 07 May 2021 06:14:14 -0700 (PDT) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:711f:8553:a124:a19]) by smtp.gmail.com with ESMTPSA id z29sm4656539pga.52.2021.05.07.06.14.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 May 2021 06:14:14 -0700 (PDT) From: Hsin-Yi Wang To: Wolfram Sang , Matthias Brugger , Rob Herring , Bartosz Golaszewski Cc: linux-i2c@vger.kernel.org, Qii Wang , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Mark Brown , Marek Szyprowski , Bibby Hsieh , Arnd Bergmann Subject: [PATCH v21 1/5] i2c: core: support bus regulator controlling in adapter Date: Fri, 7 May 2021 21:14:02 +0800 Message-Id: <20210507131406.2224177-2-hsinyi@chromium.org> X-Mailer: git-send-email 2.31.1.607.g51e8a6a459-goog In-Reply-To: <20210507131406.2224177-1-hsinyi@chromium.org> References: <20210507131406.2224177-1-hsinyi@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210507_061415_758808_2716FB1A X-CRM114-Status: GOOD ( 19.46 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org From: Bibby Hsieh Although in the most platforms, the bus power of i2c are alway on, some platforms disable the i2c bus power in order to meet low power request. We can control bulk regulator if it is provided in i2c adapter device. Signed-off-by: Bibby Hsieh Signed-off-by: Marek Szyprowski Signed-off-by: Hsin-Yi Wang Reviewed-by: Matthias Brugger --- drivers/i2c/i2c-core-base.c | 95 +++++++++++++++++++++++++++++++++++++ include/linux/i2c.h | 2 + 2 files changed, 97 insertions(+) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 5a97e4a02fa2..23bc7c269184 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -461,12 +461,14 @@ static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client) static int i2c_device_probe(struct device *dev) { struct i2c_client *client = i2c_verify_client(dev); + struct i2c_adapter *adap; struct i2c_driver *driver; int status; if (!client) return 0; + adap = client->adapter; client->irq = client->init_irq; if (!client->irq) { @@ -532,6 +534,14 @@ static int i2c_device_probe(struct device *dev) dev_dbg(dev, "probe\n"); + if (adap->bus_regulator) { + status = regulator_enable(adap->bus_regulator); + if (status < 0) { + dev_err(&adap->dev, "Failed to enable bus regulator\n"); + goto err_clear_wakeup_irq; + } + } + status = of_clk_set_defaults(dev->of_node, false); if (status < 0) goto err_clear_wakeup_irq; @@ -589,8 +599,10 @@ static int i2c_device_probe(struct device *dev) static int i2c_device_remove(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); + struct i2c_adapter *adap; struct i2c_driver *driver; + adap = client->adapter; driver = to_i2c_driver(dev->driver); if (driver->remove) { int status; @@ -605,6 +617,8 @@ static int i2c_device_remove(struct device *dev) devres_release_group(&client->dev, client->devres_group_id); dev_pm_domain_detach(&client->dev, true); + if (!pm_runtime_status_suspended(&client->dev) && adap->bus_regulator) + regulator_disable(adap->bus_regulator); dev_pm_clear_wake_irq(&client->dev); device_init_wakeup(&client->dev, false); @@ -617,6 +631,86 @@ static int i2c_device_remove(struct device *dev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int i2c_resume_early(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + int err; + + if (!client) + return 0; + + if (pm_runtime_status_suspended(&client->dev) && + client->adapter->bus_regulator) { + err = regulator_enable(client->adapter->bus_regulator); + if (err) + return err; + } + + return pm_generic_resume_early(&client->dev); +} + +static int i2c_suspend_late(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + int err; + + if (!client) + return 0; + + err = pm_generic_suspend_late(&client->dev); + if (err) + return err; + + if (!pm_runtime_status_suspended(&client->dev) && + client->adapter->bus_regulator) + return regulator_disable(client->adapter->bus_regulator); + + return 0; +} +#endif + +#ifdef CONFIG_PM +static int i2c_runtime_resume(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + int err; + + if (!client) + return 0; + + if (client->adapter->bus_regulator) { + err = regulator_enable(client->adapter->bus_regulator); + if (err) + return err; + } + + return pm_generic_runtime_resume(&client->dev); +} + +static int i2c_runtime_suspend(struct device *dev) +{ + struct i2c_client *client = i2c_verify_client(dev); + int err; + + if (!client) + return 0; + + err = pm_generic_runtime_suspend(&client->dev); + if (err) + return err; + + if (client->adapter->bus_regulator) + return regulator_disable(client->adapter->bus_regulator); + return 0; +} +#endif + +static const struct dev_pm_ops i2c_device_pm = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(i2c_suspend_late, i2c_resume_early) + SET_RUNTIME_PM_OPS(i2c_runtime_suspend, i2c_runtime_resume, NULL) +}; + static void i2c_device_shutdown(struct device *dev) { struct i2c_client *client = i2c_verify_client(dev); @@ -674,6 +768,7 @@ struct bus_type i2c_bus_type = { .probe = i2c_device_probe, .remove = i2c_device_remove, .shutdown = i2c_device_shutdown, + .pm = &i2c_device_pm, }; EXPORT_SYMBOL_GPL(i2c_bus_type); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index e8f2ac8c9c3d..953a4eecb88f 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -15,6 +15,7 @@ #include /* for struct device */ #include /* for completion */ #include +#include #include #include /* for Host Notify IRQ */ #include /* for struct device_node */ @@ -729,6 +730,7 @@ struct i2c_adapter { const struct i2c_adapter_quirks *quirks; struct irq_domain *host_notify_domain; + struct regulator *bus_regulator; }; #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)