From patchwork Thu May 27 07:55:53 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: 449101 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 CB255C4707F for ; Thu, 27 May 2021 07:56:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2A8A6144B for ; Thu, 27 May 2021 07:56:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234076AbhE0H6L (ORCPT ); Thu, 27 May 2021 03:58:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234982AbhE0H5h (ORCPT ); Thu, 27 May 2021 03:57:37 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07D3AC061574 for ; Thu, 27 May 2021 00:56:05 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id k5so2284120pjj.1 for ; Thu, 27 May 2021 00:56:05 -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=VZUPXREZ1PjKj1d2Hxat9QQw1N2e9nbL6sFWBfS1Vpw=; b=HhR2Z+UR/b0SShfqRiDIqIeE9XVO40D7x12Ut0QL5fW0cu5OdPFV9MLpkYra2tKOeG SZMsmj2c++8KLKom7kTzirRKt2eHGZbxXvFJrFmUTZdB+sfx/I7LEIPg+5LQKFXgPZax SotQId1UeMa8u1Kppg+8CkVd/TwF+ppbFN3aM= 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=VZUPXREZ1PjKj1d2Hxat9QQw1N2e9nbL6sFWBfS1Vpw=; b=ZLVYpTNZ7mBU5jGs2z7sFgr6e2okPMcU47zSLuw4bU0/tIai6Y/2uVSWKT7rBIWBmW UYN6lpsT07QzHTwm1x2DZYv+PXvGjDu6yjY5BBraP0VU8Q4S0f5MkMqqAaIkDFBY/aFb I3jk0CAQOPiRQp5i2pEMzWAO+04DYSP//NyNr1qqWiHucE3HM5uiVYiGB6X+P25R71iF 0C+m20XF5jVgvltaATMEg9yrJjfQM75jk0jXFiJmEFVBGJkXtRRYiszgFQ2zpwsczuBj d27MOyKmPY9bCccKXdFOt3VEtz1TAg15YwnrLIBJnvjUt9lyv+qxhi0V8q3EX//rwJot J6Og== X-Gm-Message-State: AOAM532d6Ov2YZBUqZ1co9+H91WoUb+yJcXGPSsRE+gOYhyc8Reg7UG7 bljUZ6I5U8q6mHtLHQYhKZtL5ICcJ6IkRA== X-Google-Smtp-Source: ABdhPJxYw0z3kukLLrhghFssV8w/BNkceyOm52LUGmCWpWzA9BjLVtbW2650pT5No76FyoGwTVw5+g== X-Received: by 2002:a17:90a:7bcc:: with SMTP id d12mr8385514pjl.230.1622102164520; Thu, 27 May 2021 00:56:04 -0700 (PDT) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:ece5:55a4:6ad3:d20f]) by smtp.gmail.com with ESMTPSA id 69sm1217790pfx.115.2021.05.27.00.56.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 May 2021 00:56:04 -0700 (PDT) From: Hsin-Yi Wang To: Wolfram Sang , Matthias Brugger , Jean Delvare , 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 RESEND 1/4] i2c: core: support bus regulator controlling in adapter Date: Thu, 27 May 2021 15:55:53 +0800 Message-Id: <20210527075556.1709140-2-hsinyi@chromium.org> X-Mailer: git-send-email 2.31.1.818.g46aad6cb9e-goog In-Reply-To: <20210527075556.1709140-1-hsinyi@chromium.org> References: <20210527075556.1709140-1-hsinyi@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.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)