From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 21CC710854D0 for ; Wed, 18 Mar 2026 08:46:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding: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=jNAxvMlpKbnk3xa//SsNLWzTbu90yHBu0yVq6XBO01c=; b=aH6hLZsZm/uJFi3u7AwYErW+SZ PtS/jQWnyINhoLMBAbEQo/Kn9MzNMV7eI1DKIKqpiZo4RMfu5OwMNT1GiQ293nv8HY0eiG5qjA7oV ub1Y2RRKtu3oRUhNO9IbP099IGDqMQysrCDqmr8rHaNN+jKFC1R4Hxyn/QW9y9xUhrB0XGmoPfQ0J 7LeDO0ZKc7jPOKtjX9gKYxgf5GHjDXZjHmaZwoIWlY5L76FQOnTnv/MMwzgbsWHQlGxB6y04jdO1o vtWlyi82Mn+Ifd4EqMGxf7ClewhKOzlSk2aIZtmN6hh3E3Ec21Ni/IQ2e+GZ7vaRkfFaqRf5pqegz 6Th1qgoA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w2mY2-000000084ZH-2m3g; Wed, 18 Mar 2026 08:46:38 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w2mXv-000000084Wn-3YJf; Wed, 18 Mar 2026 08:46:32 +0000 X-UUID: f3a0c80a22a611f1a6de359d7043e138-20260318 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=jNAxvMlpKbnk3xa//SsNLWzTbu90yHBu0yVq6XBO01c=; b=toI8xKgU2WD1t7OZU/WLbYxyU9Urz1RDYoaA9HO1DNvwkhLlP771UG/nPjdG5zJAZZZIwpHh4g0/KcxD4utzAW4rplZlgLY3+e5AqYD9lULknxZYNfsemt9KWKtoJwaXksWJ5MTWsTXp28461lEcoapikLOToe9D19f4ByWl8fE=; X-CID-CACHE: Type:Local,Time:202603180111-07,HitQuantity:5 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:beaefeb9-a3e9-45d3-90b4-ca5b60ec99f8,IP:0,U RL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:-5 X-CID-META: VersionHash:e7bac3a,CLOUDID:7179a24c-9183-487b-8624-e74f2dd98990,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|888|898,TC:-5,Content: 0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0,OSI :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 X-UUID: f3a0c80a22a611f1a6de359d7043e138-20260318 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 2041248436; Wed, 18 Mar 2026 01:46:27 -0700 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Wed, 18 Mar 2026 16:46:24 +0800 Received: from mtksitap99.mediatek.inc (10.233.130.16) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Wed, 18 Mar 2026 16:46:24 +0800 From: adlavinitha reddy To: Qii Wang , Andi Shyti , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , adlavinitha reddy Subject: [v1,PATCH 1/1] i2c: mediatek: add bus regulator control for power 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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260318_014631_882649_C8EA5B13 X-CRM114-Status: GOOD ( 15.08 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add conditional bus regulator enable/disable in mtk_i2c_transfer() to support I2C bus power gating for platforms that require it. This implementation: - Enables bus_regulator before clk_bulk_enable() if vbus-supply is defined - Disables bus_regulator after clk_bulk_disable() - Only activates when vbus-supply is provided in device tree - Has no impact on platforms without vbus-supply defined This approach provides power savinggs for platforms with an extra I2C bus regulator, while avoiding runtime PM complexity. TEST= Build and boot on MT8188 Signed-off-by: adlavinitha reddy --- drivers/i2c/busses/i2c-mt65xx.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index cb4d3aa709d0..126040ca05f1 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -1244,9 +1245,15 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap, bool write_then_read_en = false; struct mtk_i2c *i2c = i2c_get_adapdata(adap); + if (i2c->adap.bus_regulator) { + ret = regulator_enable(i2c->adap.bus_regulator); + if (ret) + return ret; + } + ret = clk_bulk_enable(I2C_MT65XX_CLK_MAX, i2c->clocks); if (ret) - return ret; + goto err_regulator; i2c->auto_restart = i2c->dev_comp->auto_restart; @@ -1301,6 +1308,10 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap, err_exit: clk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks); +err_regulator: + if (i2c->adap.bus_regulator) + regulator_disable(i2c->adap.bus_regulator); + return ret; } -- 2.45.2