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[82.55.252.101]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-48fe4c88495sm346659955e9.4.2026.05.19.15.33.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 15:33:07 -0700 (PDT) From: Christian Marangi To: Stefan Roese , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Christian Marangi Subject: [PATCH v3 1/5] i2c: mt7621: rework cmd/wait OPs to support atomic afer variant Date: Wed, 20 May 2026 00:32:43 +0200 Message-ID: <20260519223253.1093-2-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260519223253.1093-1-ansuelsmth@gmail.com> References: <20260519223253.1093-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" It was reported the need for atomic operation on some Airoha SoC that makes use of I2C bus. Rework the cmd/wait OPs to suppor the xfer_atomic variant. To support this it's mainlin needed to do the readl poll in atomic context. Signed-off-by: Christian Marangi --- drivers/i2c/busses/i2c-mt7621.c | 56 ++++++++++++++++++++++----------- 1 file changed, 38 insertions(+), 18 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt762= 1.c index 0a288c998419..700beb9e7b1a 100644 --- a/drivers/i2c/busses/i2c-mt7621.c +++ b/drivers/i2c/busses/i2c-mt7621.c @@ -67,14 +67,19 @@ struct mtk_i2c { struct clk *clk; }; =20 -static int mtk_i2c_wait_idle(struct mtk_i2c *i2c) +static int mtk_i2c_wait_idle(struct mtk_i2c *i2c, bool atomic) { int ret; u32 val; =20 - ret =3D readl_relaxed_poll_timeout(i2c->base + REG_SM0CTL1_REG, - val, !(val & SM0CTL1_TRI), - 10, TIMEOUT_MS * 1000); + if (atomic) + ret =3D readl_relaxed_poll_timeout_atomic(i2c->base + REG_SM0CTL1_REG, + val, !(val & SM0CTL1_TRI), + 10, TIMEOUT_MS * 1000); + else + ret =3D readl_relaxed_poll_timeout(i2c->base + REG_SM0CTL1_REG, + val, !(val & SM0CTL1_TRI), + 10, TIMEOUT_MS * 1000); if (ret) dev_dbg(i2c->dev, "idle err(%d)\n", ret); =20 @@ -117,27 +122,28 @@ static int mtk_i2c_check_ack(struct mtk_i2c *i2c, u32= expected) return ((ack & ack_expected) =3D=3D ack_expected) ? 0 : -ENXIO; } =20 -static int mtk_i2c_start(struct mtk_i2c *i2c) +static int mtk_i2c_start(struct mtk_i2c *i2c, bool atomic) { iowrite32(SM0CTL1_START | SM0CTL1_TRI, i2c->base + REG_SM0CTL1_REG); - return mtk_i2c_wait_idle(i2c); + return mtk_i2c_wait_idle(i2c, atomic); } =20 -static int mtk_i2c_stop(struct mtk_i2c *i2c) +static int mtk_i2c_stop(struct mtk_i2c *i2c, bool atomic) { iowrite32(SM0CTL1_STOP | SM0CTL1_TRI, i2c->base + REG_SM0CTL1_REG); - return mtk_i2c_wait_idle(i2c); + return mtk_i2c_wait_idle(i2c, atomic); } =20 -static int mtk_i2c_cmd(struct mtk_i2c *i2c, u32 cmd, int page_len) +static int mtk_i2c_cmd(struct mtk_i2c *i2c, u32 cmd, int page_len, + bool atomic) { iowrite32(cmd | SM0CTL1_TRI | SM0CTL1_PGLEN(page_len), i2c->base + REG_SM0CTL1_REG); - return mtk_i2c_wait_idle(i2c); + return mtk_i2c_wait_idle(i2c, atomic); } =20 -static int mtk_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, - int num) +static int mtk_i2c_xfer_common(struct i2c_adapter *adap, struct i2c_msg *m= sgs, + int num, bool atomic) { struct mtk_i2c *i2c; struct i2c_msg *pmsg; @@ -152,12 +158,12 @@ static int mtk_i2c_xfer(struct i2c_adapter *adap, str= uct i2c_msg *msgs, pmsg =3D &msgs[i]; =20 /* wait hardware idle */ - ret =3D mtk_i2c_wait_idle(i2c); + ret =3D mtk_i2c_wait_idle(i2c, atomic); if (ret) goto err_timeout; =20 /* start sequence */ - ret =3D mtk_i2c_start(i2c); + ret =3D mtk_i2c_start(i2c, atomic); if (ret) goto err_timeout; =20 @@ -173,7 +179,8 @@ static int mtk_i2c_xfer(struct i2c_adapter *adap, struc= t i2c_msg *msgs, len =3D 1; } iowrite32(addr, i2c->base + REG_SM0D0_REG); - ret =3D mtk_i2c_cmd(i2c, SM0CTL1_WRITE, len); + ret =3D mtk_i2c_cmd(i2c, SM0CTL1_WRITE, len, + atomic); if (ret) goto err_timeout; =20 @@ -198,7 +205,7 @@ static int mtk_i2c_xfer(struct i2c_adapter *adap, struc= t i2c_msg *msgs, cmd =3D SM0CTL1_WRITE; } =20 - ret =3D mtk_i2c_cmd(i2c, cmd, page_len); + ret =3D mtk_i2c_cmd(i2c, cmd, page_len, atomic); if (ret) goto err_timeout; =20 @@ -218,7 +225,7 @@ static int mtk_i2c_xfer(struct i2c_adapter *adap, struc= t i2c_msg *msgs, } } =20 - ret =3D mtk_i2c_stop(i2c); + ret =3D mtk_i2c_stop(i2c, atomic); if (ret) goto err_timeout; =20 @@ -226,7 +233,7 @@ static int mtk_i2c_xfer(struct i2c_adapter *adap, struc= t i2c_msg *msgs, return i; =20 err_ack: - ret =3D mtk_i2c_stop(i2c); + ret =3D mtk_i2c_stop(i2c, atomic); if (ret) goto err_timeout; return -ENXIO; @@ -237,6 +244,18 @@ static int mtk_i2c_xfer(struct i2c_adapter *adap, stru= ct i2c_msg *msgs, return ret; } =20 +static int mtk_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, + int num) +{ + return mtk_i2c_xfer_common(adap, msgs, num, false); +} + +static int mtk_i2c_xfer_atomic(struct i2c_adapter *adap, + struct i2c_msg *msgs, int num) +{ + return mtk_i2c_xfer_common(adap, msgs, num, true); +} + static u32 mtk_i2c_func(struct i2c_adapter *a) { return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING; @@ -244,6 +263,7 @@ static u32 mtk_i2c_func(struct i2c_adapter *a) =20 static const struct i2c_algorithm mtk_i2c_algo =3D { .xfer =3D mtk_i2c_xfer, + .xfer_atomic =3D mtk_i2c_xfer_atomic, .functionality =3D mtk_i2c_func, }; 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[82.55.252.101]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-48fe4c88495sm346659955e9.4.2026.05.19.15.33.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 15:33:09 -0700 (PDT) From: Christian Marangi To: Stefan Roese , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Christian Marangi Subject: [PATCH v3 2/5] i2c: mt7621: clear pending interrupt on i2c reset Date: Wed, 20 May 2026 00:32:44 +0200 Message-ID: <20260519223253.1093-3-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260519223253.1093-1-ansuelsmth@gmail.com> References: <20260519223253.1093-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On resetting the i2c bus, clear any pending interrupt to have a more consistent state on the next operation. Signed-off-by: Christian Marangi --- drivers/i2c/busses/i2c-mt7621.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt762= 1.c index 700beb9e7b1a..d8fa29e7e0fa 100644 --- a/drivers/i2c/busses/i2c-mt7621.c +++ b/drivers/i2c/busses/i2c-mt7621.c @@ -101,6 +101,8 @@ static void mtk_i2c_reset(struct mtk_i2c *i2c) iowrite32(((i2c->clk_div << 16) & SM0CTL0_CLK_DIV_MASK) | SM0CTL0_EN | SM0CTL0_SCL_STRETCH, i2c->base + REG_SM0CTL0_REG); iowrite32(0, i2c->base + REG_SM0CFG2_REG); + /* Clear any pending interrupt */ + iowrite32(1, i2c->base + REG_PINTEN_REG); } =20 static void mtk_i2c_dump_reg(struct mtk_i2c *i2c) --=20 2.53.0 From nobody Mon May 25 01:14:39 2026 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7111836D9E9 for ; Tue, 19 May 2026 22:33:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779229998; cv=none; b=KElGn+6DrEX9Ugq2FKEVunxLfJ+8jle36D7ZtVNkDqPJXr0rGMAV4MjNDe88mpUx+2nOvPzC92xekR5IDFe3aAPVCbZFRE2I8aUPjUxRRC2aDD7oCDsV316+8LcPI+HQQ6JNfPCRt2lwL4bg7ut0xbDM/CINu0NW5KXMpBnhEWg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779229998; c=relaxed/simple; bh=NYh7GkAaQitazkIJS4x9NUz41kWd9WOoj1M6tPz0fa4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZT2UwffkCEW8N2Kha02RjpwZwedwzh+FD0V+1pezDSOCLzgVbPfb68aXdgk3LxvDCiel1/hK5V5M8cx31mhJZMrrmS4CRTqFXDTCq8NLcfSemMJ7agG+7TSNG7G2bgeciDcf1KaNOygVb4je5HNz233eSCr7Jeczmv542XLn5ko= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=caZbYzrQ; arc=none smtp.client-ip=209.85.128.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="caZbYzrQ" Received: by mail-wm1-f48.google.com with SMTP id 5b1f17b1804b1-48a7fe4f40bso50272955e9.0 for ; Tue, 19 May 2026 15:33:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1779229992; x=1779834792; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MKUS30hEKkJqsuTkVMrr7mwScb2qlJAj6ESCesmLApg=; b=caZbYzrQdRftFV0MaNvnlrUK2RVP53zySKXI177wmGdV8fYV7NHtEll4p4B7kdY0B8 ISUoK9mNIg3YleZ7jeLvXfF8VH0LVAOvjRq0pJwSlGY9vB3rYa5Osr31VZqwgu8zcBXS 0a1ikzq59QIAX+dCSF5h+hc58wIdXkyTfKiHmTXQEsNUTdy41U8BS5nZSl8Md+dUF9uD CMvWLFw8olNPsxd5p9/n89wBdYmiAfy4/vFyQQmWihko/UHbyWTGekrxFG+Is0ORaV9n r1vLVzz8Fy+xYUkxHkAcxMXDGXfkRnOX8hUQMZU4Rx+6ETVIPADaEFYXWPYZWeAVSg7b Yklw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779229992; x=1779834792; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=MKUS30hEKkJqsuTkVMrr7mwScb2qlJAj6ESCesmLApg=; b=G0tKLJ258VJq0JMdCgmEwt1p8F9C38BgFJ3qTVUxmq56KxD+nmCaMWuptYBxPX9ttn JXNDhegllheUzqbfiustzLWyTxMrP1QHRK/NWAI2pXmUjSpxYSfVp9Vod6RokVL5jhg6 i+5QfBFEiWGwTPQKfInoQ6+dZ481djxj89S+po65APGEqfy6UfnBFd3GyQI/A5ZlJinh QO8O1MMzYlTd8x/IjufPHOeZzk0y7Ixh8SLSw4I34nvkUbj1Z0JpyIWJpA8px38VmbTT g2GCZ/CjhzoRxdbH+LaMKde1bGI5g/YDUQ2ewMf7gjOBufXIB/1WxVRYEZyFU95uUdhW 4tSw== X-Forwarded-Encrypted: i=1; AFNElJ/zfuNmWZAvCJMG9bHV3R1esMBmGfXaY0gWk+0QmAgEUc6xyeUltn09Vb7TM8+7gJtePNqiuPKqCOM5F34=@vger.kernel.org X-Gm-Message-State: AOJu0YwjDWkWGAeMDEdkBnuB0CX5bqWrq5oyHbddKEfbnr7v/Xq09vrs tYTvxEMQmNJMkZ0diNenw80ivD2GTJA6OC6CF86E9obj4sGcludPFC7L X-Gm-Gg: Acq92OHv5ObWYeaNB9xHzegrjMp2g2+C4ERln/mwLUsNc1ny+B9bK4Iwp8h7xhgCGiR h6IGtq6+qnCSDb/sOVBrlpDx6I2yKXAaSmxr/xArluzQSPUEEWFxcbF64pi6fic6gsV3pJMSYnG pQdWeVIyC9sVoXpJnbhPq5YXkamRU4sxnjOjii6uppOmCVovBb8t1mbMp8RyFSbNr71kKhpImfg I1PepLnl9LvWP4WGRNMt1TMPwQnEtt200vulnydEanb7sgWUhm/FJR7kTGU6pUSkK4CQapWt0Pl HbOeg6tyrI1xLM5VfeSBb1sqHWxbkGiGI3rK68XuKXBAwqXP+i4G7HMNzO+Hphmgmzznbwm1NN8 WdlRFO71gmvqAWV47jCK9cnHQNVl1nTCnp1CZ37/xH5S2kev76KeHoh1OXqCM6RIHPsVAo4qLdP xlh+yd+daO7SWqheW2743aLAuXBWxnZw6NWQfMgLEP2C+P/UmcOspc/0Rx0k8dm+j9TYvSpvUO8 njOHqxQiQ== X-Received: by 2002:a05:600c:2d86:b0:48f:d5b2:7c42 with SMTP id 5b1f17b1804b1-48fe63259camr228600395e9.17.1779229991759; Tue, 19 May 2026 15:33:11 -0700 (PDT) Received: from Ansuel-XPS24 (host-82-55-252-101.retail.telecomitalia.it. [82.55.252.101]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-48fe4c88495sm346659955e9.4.2026.05.19.15.33.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 15:33:11 -0700 (PDT) From: Christian Marangi To: Stefan Roese , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Christian Marangi Subject: [PATCH v3 3/5] dt-bindings: i2c: mt7621: Document an7581 compatible Date: Wed, 20 May 2026 00:32:45 +0200 Message-ID: <20260519223253.1093-4-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260519223253.1093-1-ansuelsmth@gmail.com> References: <20260519223253.1093-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Airoha SoC implement the same Mediatek logic for I2C bus with the only difference of not having a dedicated reset line to reset it. Add a dedicated compatible for the Airoha AN7581 SoC and reject the unsupported property. Signed-off-by: Christian Marangi --- .../bindings/i2c/mediatek,mt7621-i2c.yaml | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml= b/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml index 118ec00fc190..8223fbc74f14 100644 --- a/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml @@ -14,7 +14,9 @@ allOf: =20 properties: compatible: - const: mediatek,mt7621-i2c + enum: + - airoha,an7581-i2c + - mediatek,mt7621-i2c =20 reg: maxItems: 1 @@ -38,6 +40,16 @@ required: - "#address-cells" - "#size-cells" =20 +if: + properties: + compatible: + contains: + const: airoha,an7581-i2c +then: + properties: + resets: false + reset-names: false + unevaluatedProperties: false =20 examples: --=20 2.53.0 From nobody Mon May 25 01:14:39 2026 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E01261B4F0A for ; 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[82.55.252.101]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-48fe4c88495sm346659955e9.4.2026.05.19.15.33.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 15:33:12 -0700 (PDT) From: Christian Marangi To: Stefan Roese , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Christian Marangi Subject: [PATCH v3 4/5] i2c: mt7621: limit SCL_STRETCH only to Mediatek SoC Date: Wed, 20 May 2026 00:32:46 +0200 Message-ID: <20260519223253.1093-5-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260519223253.1093-1-ansuelsmth@gmail.com> References: <20260519223253.1093-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The same I2C driver is also used for Airoha SoC with the only difference that the i2c_reset should not enable SCL_STRETCH for Airoha SoC. Introduce a new compatible for Airoha and limit the SCL_STRETCH only to mediatek SoC. Signed-off-by: Christian Marangi --- drivers/i2c/busses/i2c-mt7621.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt762= 1.c index d8fa29e7e0fa..3cde43c57a2b 100644 --- a/drivers/i2c/busses/i2c-mt7621.c +++ b/drivers/i2c/busses/i2c-mt7621.c @@ -88,6 +88,7 @@ static int mtk_i2c_wait_idle(struct mtk_i2c *i2c, bool at= omic) =20 static void mtk_i2c_reset(struct mtk_i2c *i2c) { + u32 reg; int ret; =20 ret =3D device_reset(i2c->adap.dev.parent); @@ -98,8 +99,12 @@ static void mtk_i2c_reset(struct mtk_i2c *i2c) * Don't set SM0CTL0_ODRAIN as its bit meaning is inverted. To * configure open-drain mode, this bit needs to be cleared. */ - iowrite32(((i2c->clk_div << 16) & SM0CTL0_CLK_DIV_MASK) | SM0CTL0_EN | - SM0CTL0_SCL_STRETCH, i2c->base + REG_SM0CTL0_REG); + reg =3D ((i2c->clk_div << 16) & SM0CTL0_CLK_DIV_MASK) | SM0CTL0_EN; + /* Set SCL_STRETCH only for Mediatek SoC */ + if (device_is_compatible(i2c->dev, "mediatek,mt7621-i2c")) + reg |=3D SM0CTL0_SCL_STRETCH; + + iowrite32(reg, i2c->base + REG_SM0CTL0_REG); iowrite32(0, i2c->base + REG_SM0CFG2_REG); /* Clear any pending interrupt */ iowrite32(1, i2c->base + REG_PINTEN_REG); @@ -271,6 +276,7 @@ static const struct i2c_algorithm mtk_i2c_algo =3D { =20 static const struct of_device_id i2c_mtk_dt_ids[] =3D { { .compatible =3D "mediatek,mt7621-i2c" }, + { .compatible =3D "airoha,an7581-i2c" }, { /* sentinel */ } }; =20 --=20 2.53.0 From nobody Mon May 25 01:14:39 2026 Received: from mail-wr1-f41.google.com (mail-wr1-f41.google.com [209.85.221.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3207C369D7C for ; 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[82.55.252.101]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-48fe4c88495sm346659955e9.4.2026.05.19.15.33.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 15:33:14 -0700 (PDT) From: Christian Marangi To: Stefan Roese , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Christian Marangi Subject: [PATCH v3 5/5] i2c: mt7621: make device reset optional Date: Wed, 20 May 2026 00:32:47 +0200 Message-ID: <20260519223253.1093-6-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260519223253.1093-1-ansuelsmth@gmail.com> References: <20260519223253.1093-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Airoha SoC that makes use of the same Mediatek I2C driver/logic doesn't have reset line for I2C so use optional device_reset variant. Signed-off-by: Christian Marangi --- drivers/i2c/busses/i2c-mt7621.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt762= 1.c index 3cde43c57a2b..fb9d9701bb10 100644 --- a/drivers/i2c/busses/i2c-mt7621.c +++ b/drivers/i2c/busses/i2c-mt7621.c @@ -91,7 +91,7 @@ static void mtk_i2c_reset(struct mtk_i2c *i2c) u32 reg; int ret; =20 - ret =3D device_reset(i2c->adap.dev.parent); + ret =3D device_reset_optional(i2c->adap.dev.parent); if (ret) dev_err(i2c->dev, "I2C reset failed!\n"); =20 --=20 2.53.0