From patchwork Fri Mar 5 10:20:04 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: 394747 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=-18.8 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 6846FC433DB for ; Fri, 5 Mar 2021 10:21:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 271E064EDF for ; Fri, 5 Mar 2021 10:21:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229558AbhCEKUj (ORCPT ); Fri, 5 Mar 2021 05:20:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229935AbhCEKUK (ORCPT ); Fri, 5 Mar 2021 05:20:10 -0500 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84677C061756 for ; Fri, 5 Mar 2021 02:20:09 -0800 (PST) Received: by mail-pl1-x62d.google.com with SMTP id d8so1167824plg.10 for ; Fri, 05 Mar 2021 02:20:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=EUACLrL4E5J+zKlEM3mMmLgSh+SjeWlUxfMZEcaS8n0=; b=Cu64HLf0HIdq0y7140t5Tlz3UVHd6eyis3sDus6y32di/8IKUdlokhzh9DfUSEVjpP SUSElAYITZcFx7+PxUEUS3+h4mipkfxyHKdWIkgJj3v3hGQoo5sTBDrty/vvikqV7rc5 Pb2TLpAQodcHd7GwqYX/+Y6Gbuni3G9nxKCBA= 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:mime-version :content-transfer-encoding; bh=EUACLrL4E5J+zKlEM3mMmLgSh+SjeWlUxfMZEcaS8n0=; b=Ebv16TZ5AVxhZ8el6n7x8PSrqGzFN7lJVxO82AnY1KCsiYy6YHhR9O6WQnY40V7VP3 Y0pkhLEJLnGSTZZM/6sW+wIa275zIiJLphvR2N3shkPx9RKMYKSq0l1a4IB4q2MkQOhv 891JQNPuLCwPmGQxqeljGpiYbWepoPGyLxX5WZIy9ph4zfy9LMnoFStaiaVNCyGvnW6u RquTKb1Temf/QOSYTEwMcV3a2dnyBnc4BVpCziUi3LxTBjK4p8lbvZy/W3KvUeWn+ipp BZPtYQ0akBvWUzbL2jFekMNCbZlA6cXjQ28lVRfxudBMTsFVn6c26JqsjhKl1oE2rmn+ KILA== X-Gm-Message-State: AOAM533gduyVIUk6RIaYY5YHAKYk8k/iMSoeHQH3jX9kTSXd5jLmkIQT tT96MPeqBnTBDPbf2Nl0qTw9jg== X-Google-Smtp-Source: ABdhPJyxjguts9N9hJbIy+WBqBM4VkGt4dYdC45mzBbXhIJhRr6WiT2Rig05kbCicwVUCFTc/FOD0A== X-Received: by 2002:a17:902:8ec1:b029:dc:8ae1:7a22 with SMTP id x1-20020a1709028ec1b02900dc8ae17a22mr8029087plo.6.1614939608896; Fri, 05 Mar 2021 02:20:08 -0800 (PST) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:5da1:da1b:5bcf:2d46]) by smtp.gmail.com with ESMTPSA id c12sm2402672pfp.17.2021.03.05.02.20.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Mar 2021 02:20:08 -0800 (PST) From: Hsin-Yi Wang To: Wolfram Sang , Bartosz Golaszewski , linux-i2c@vger.kernel.org Cc: Matthias Brugger , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Bibby Hsieh , Marek Szyprowski Subject: [PATCH] i2c: core: support bus regulator controlling in adapter Date: Fri, 5 Mar 2021 18:20:04 +0800 Message-Id: <20210305102004.191209-1-hsinyi@chromium.org> X-Mailer: git-send-email 2.30.1.766.gb4fecdf3b7-goog 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 get and enable bulk regulator in i2c adapter device. Signed-off-by: Bibby Hsieh Signed-off-by: Marek Szyprowski Signed-off-by: Hsin-Yi Wang --- This patch is squashed from following patch and tested on mt8183 device which has eeprom at24 client under i2c, so the fix in [2] is also verified. [1] https://patchwork.ozlabs.org/project/linux-i2c/cover/20200519072729.7268-1-bibby.hsieh@mediatek.com/ [2] https://patchwork.ozlabs.org/project/linux-i2c/patch/20200522101327.13456-1-m.szyprowski@samsung.com/ --- drivers/i2c/i2c-core-base.c | 93 +++++++++++++++++++++++++++++++++++++ include/linux/i2c.h | 2 + 2 files changed, 95 insertions(+) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 63ebf722a424..667f4a4de7cc 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -439,12 +439,14 @@ 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) { @@ -510,6 +512,12 @@ static int i2c_device_probe(struct device *dev) dev_dbg(dev, "probe\n"); + status = regulator_enable(adap->bus_regulator); + if (status < 0) { + dev_err(&adap->dev, "Failed to enable power regulator\n"); + goto err_clear_wakeup_irq; + } + status = of_clk_set_defaults(dev->of_node, false); if (status < 0) goto err_clear_wakeup_irq; @@ -550,8 +558,10 @@ 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; @@ -564,6 +574,8 @@ static int i2c_device_remove(struct device *dev) } dev_pm_domain_detach(&client->dev, true); + if (!pm_runtime_status_suspended(&client->dev)) + regulator_disable(adap->bus_regulator); dev_pm_clear_wake_irq(&client->dev); device_init_wakeup(&client->dev, false); @@ -576,6 +588,80 @@ 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)) { + 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)) + 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; + + 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; + + return regulator_disable(client->adapter->bus_regulator); +} +#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); @@ -633,6 +719,7 @@ 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); @@ -1446,6 +1533,12 @@ static int i2c_register_adapter(struct i2c_adapter *adap) if (res) goto out_reg; + adap->bus_regulator = devm_regulator_get(&adap->dev, "bus"); + if (IS_ERR(adap->bus_regulator)) { + res = PTR_ERR(adap->bus_regulator); + goto out_reg; + } + pm_runtime_no_callbacks(&adap->dev); pm_suspend_ignore_children(&adap->dev, true); pm_runtime_enable(&adap->dev); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 56622658b215..ec87758d9f40 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 */ @@ -721,6 +722,7 @@ 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)