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GET /api/1.2/patches/2212516/?format=api
{ "id": 2212516, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2212516/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260318084621.4127757-2-adlavinitha.reddy@mediatek.com/", "project": { "id": 35, "url": "http://patchwork.ozlabs.org/api/1.2/projects/35/?format=api", "name": "Linux I2C development", "link_name": "linux-i2c", "list_id": "linux-i2c.vger.kernel.org", "list_email": "linux-i2c@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260318084621.4127757-2-adlavinitha.reddy@mediatek.com>", "list_archive_url": null, "date": "2026-03-18T08:46:16", "name": "[v1,1/1] i2c: mediatek: add bus regulator control for power saving", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "8612ae7cb3cc350524419d62fd3c657d554a2e82", "submitter": { "id": 92899, "url": "http://patchwork.ozlabs.org/api/1.2/people/92899/?format=api", "name": "adlavinitha reddy", "email": "adlavinitha.reddy@mediatek.com" }, "delegate": { "id": 149066, "url": "http://patchwork.ozlabs.org/api/1.2/users/149066/?format=api", "username": "cazzacarna", "first_name": "Andi", "last_name": "Shyti", "email": "andi.shyti@kernel.org" }, "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260318084621.4127757-2-adlavinitha.reddy@mediatek.com/mbox/", "series": [ { "id": 496419, "url": "http://patchwork.ozlabs.org/api/1.2/series/496419/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=496419", "date": "2026-03-18T08:46:15", "name": "i2c: mediatek: add bus regulator control for power saving", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/496419/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2212516/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2212516/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-i2c+bounces-16565-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-i2c@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=mediatek.com header.i=@mediatek.com header.a=rsa-sha256\n header.s=dk header.b=toI8xKgU;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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arc=none smtp.client-ip=60.244.123.138", "X-UUID": [ "f2e5bdb222a611f1a02d4725871ece0b-20260318", "f2e5bdb222a611f1a02d4725871ece0b-20260318" ], "DKIM-Signature": "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n d=mediatek.com; s=dk;\n\th=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From;\n bh=jNAxvMlpKbnk3xa//SsNLWzTbu90yHBu0yVq6XBO01c=;\n\tb=toI8xKgU2WD1t7OZU/WLbYxyU9Urz1RDYoaA9HO1DNvwkhLlP771UG/nPjdG5zJAZZZIwpHh4g0/KcxD4utzAW4rplZlgLY3+e5AqYD9lULknxZYNfsemt9KWKtoJwaXksWJ5MTWsTXp28461lEcoapikLOToe9D19f4ByWl8fE=;", "X-CID-CACHE": "Type:Local,Time:202603181611+08,HitQuantity:1", "X-CID-P-RULE": "Release_Ham", "X-CID-O-INFO": "VERSION:1.3.12,REQID:66e843d1-788b-4b4c-9c15-f4e5fab99e76,IP:0,U\n\tRL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION\n\t:release,TS:-5", "X-CID-META": "VersionHash:e7bac3a,CLOUDID:8321ef93-f8ef-4ca8-bea0-143568f9ca1d,B\n\tulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|888|898,TC:-5,Content:\n\t0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0,OSI\n\t:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0", "X-CID-BVR": "2,SSN|SDN", "X-CID-BAS": "2,SSN|SDN,0,_", "X-CID-FACTOR": "TF_CID_SPAM_SNR", "X-CID-RHF": "D41D8CD98F00B204E9800998ECF8427E", "From": "adlavinitha reddy <adlavinitha.reddy@mediatek.com>", "To": "Qii Wang <qii.wang@mediatek.com>, Andi Shyti <andi.shyti@kernel.org>,\n\tMatthias Brugger <matthias.bgg@gmail.com>, AngeloGioacchino Del Regno\n\t<angelogioacchino.delregno@collabora.com>", "CC": "<linux-i2c@vger.kernel.org>, <linux-kernel@vger.kernel.org>,\n\t<linux-arm-kernel@lists.infradead.org>, <linux-mediatek@lists.infradead.org>,\n\t<Project_Global_Chrome_Upstream_Group@mediatek.com>, adlavinitha reddy\n\t<adlavinitha.reddy@mediatek.com>", "Subject": "[v1,PATCH 1/1] i2c: mediatek: add bus regulator control for power\n saving", "Date": "Wed, 18 Mar 2026 16:46:16 +0800", "Message-ID": "<20260318084621.4127757-2-adlavinitha.reddy@mediatek.com>", "X-Mailer": "git-send-email 2.45.2", "In-Reply-To": "<20260318084621.4127757-1-adlavinitha.reddy@mediatek.com>", "References": "<20260318084621.4127757-1-adlavinitha.reddy@mediatek.com>", "Precedence": "bulk", "X-Mailing-List": "linux-i2c@vger.kernel.org", "List-Id": "<linux-i2c.vger.kernel.org>", "List-Subscribe": "<mailto:linux-i2c+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-i2c+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-MTK": "N" }, "content": "Add conditional bus regulator enable/disable in mtk_i2c_transfer()\nto support I2C bus power gating for platforms that require it.\n\nThis implementation:\n- Enables bus_regulator before clk_bulk_enable() if vbus-supply is defined\n- Disables bus_regulator after clk_bulk_disable()\n- Only activates when vbus-supply is provided in device tree\n- Has no impact on platforms without vbus-supply defined\n\nThis approach provides power savinggs for platforms with an extra I2C bus\nregulator, while avoiding runtime PM complexity.\n\nTEST= Build and boot on MT8188\n\nSigned-off-by: adlavinitha reddy <adlavinitha.reddy@mediatek.com>\n---\n drivers/i2c/busses/i2c-mt65xx.c | 13 ++++++++++++-\n 1 file changed, 12 insertions(+), 1 deletion(-)\n\n--\n2.45.2", "diff": "diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c\nindex cb4d3aa709d0..126040ca05f1 100644\n--- a/drivers/i2c/busses/i2c-mt65xx.c\n+++ b/drivers/i2c/busses/i2c-mt65xx.c\n@@ -21,6 +21,7 @@\n #include <linux/module.h>\n #include <linux/of.h>\n #include <linux/platform_device.h>\n+#include <linux/regulator/consumer.h>\n #include <linux/scatterlist.h>\n #include <linux/sched.h>\n #include <linux/slab.h>\n@@ -1244,9 +1245,15 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap,\n \tbool write_then_read_en = false;\n \tstruct mtk_i2c *i2c = i2c_get_adapdata(adap);\n\n+\tif (i2c->adap.bus_regulator) {\n+\t\tret = regulator_enable(i2c->adap.bus_regulator);\n+\t\tif (ret)\n+\t\t\treturn ret;\n+\t}\n+\n \tret = clk_bulk_enable(I2C_MT65XX_CLK_MAX, i2c->clocks);\n \tif (ret)\n-\t\treturn ret;\n+\t\tgoto err_regulator;\n\n \ti2c->auto_restart = i2c->dev_comp->auto_restart;\n\n@@ -1301,6 +1308,10 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap,\n\n err_exit:\n \tclk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks);\n+err_regulator:\n+\tif (i2c->adap.bus_regulator)\n+\t\tregulator_disable(i2c->adap.bus_regulator);\n+\n \treturn ret;\n }\n\n", "prefixes": [ "v1", "1/1" ] }