From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED1F6606A31B for ; Tue, 3 Nov 2026 21:06:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=hSISnEtm; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=aN9dMpw/ 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-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=QI5qU1trTwZm0S8t5gCAWIJ9CPL9O0gAUfA8IjPCltU=; b=hSISnEtmCjyYdn mfJbGLcuM/2EbUhZZNoft9HgHkOLbOKaYq7TfvuYd5MebBoP5PgbwguELKL/ZMNRlMexYXghXUHPe A427GDcCx9cMb5TBNJivTxQsgBHsE7WEQy7IJ0CN3TUorQRvY39DutLR3fNbVm7gs/E9yZn8xUYKB is3IXP4n5xC6xWAzEfzMY17606rQwcCW2bNxONnhoGqkvphM3CYf54vVW6ktWq9H/5Bx+/2ChV4KS slLwUoSaelXgF3eP2e3y7WaGQrLmGL5x+LmvEJ73eddzcXiMm6uaajxfJRVTHsKzEzXw/2dcScRkY 7dZYqCYLwIVvykJ6wYOQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xOLhj-00000003f5Y-14lf; Tue, 03 Nov 2026 21:06:03 +0000 Received: from mail-wr1-x42d.google.com ([2a00:1450:4864:20::42d]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xOLhe-00000003f2b-1DsD for linux-arm-kernel@lists.infradead.org; Tue, 03 Nov 2026 21:05:59 +0000 Received: by mail-wr1-x42d.google.com with SMTP id ffacd0b85a97d-48e0d1c095dso13481f8f.1 for ; Tue, 03 Nov 2026 13:05:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793739956; x=1794344756; darn=lists.infradead.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:content-type; bh=QI5qU1trTwZm0S8t5gCAWIJ9CPL9O0gAUfA8IjPCltU=; b=aN9dMpw/SnFk7Eu4cY7cXh/zg40JuF1BparjpUdBcsJdqHU63ZsLge/8roHjrj2ZSK uwHPSa9b0+g2uUijskOta6LXkt3wZIRUGiIfRbOZABVZ2eSGcy7w9MpDKySwzmMstpd9 8Ki+CzdcVaYewHsj14I75QRgcMyGY8HEfS7nxKKHU+xPbYkAKd6HFnj8r6PYyCdGLCOY xhoYCUnuKlxGWWxVqKxT1yvrCBQRrIco7a2YfoLltg9HCPZUQQ5z/hgEIgZaGvpcJWFl GhfE4kbNimYrlUoczlqkDvNkVziQwuIfR/qzHq7bVMNp/x8TpObOVSSK23NkrVbBDs1d nufg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793739956; x=1794344756; 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:content-type; bh=QI5qU1trTwZm0S8t5gCAWIJ9CPL9O0gAUfA8IjPCltU=; b=Qqw95dwYttUOzxNZHs5Z/u5wbtaiVUqgvK23KV1gzQVSZRskbXgVA+5xD5PbDvKrEU xv9LMFm40+b+GPEdaESILUgAzU0RMqA5goeCOjlSyD3P2JqVAsgBHrOccD61t2GpvWtQ eHGSnnnjpnBDH9IXPlhJZcl1ZkPiF0vFNZUAf6NAl1ThZoCNZrD1AUDBIa0yNxaZtqB9 o6o13Cyyw1FTBUGxNxxtbqaWQeF2r6E+a3HUQ16+o2YdO6MFymXy8/Q4rJfbYTYo0E2y 9psPjQ6WaaIOmvGIbtT+mG9yzVhUeh7h8wDOkpc04UiOYCppRiKZAtapM1u1pF5Dy4kO w0yQ== X-Forwarded-Encrypted: i=1; AKwUvBwIW8oVu7UhJrcPbCILeRTUL9R2E04MYZzTsjHaknrXbCXfgfoI0PZsEB/4KvouVdM7N+ReTXVlzsCcK8ijU1Yt@lists.infradead.org X-Gm-Message-State: APuU4Z8JsjXmJBG7Ol+uBq7IaPGnwWEjZCZgFukSFW4/I7HTUBl1gUHy 4+MOGrYapV8aEnFwA/FtGodBVGSIqYPGslEfXEbjzcWRjsu1WpTHsjWM X-Gm-Gg: AYBFou0DseX/QfkNceYf1b1TkqKY9rE45jiEY/XenS+abUHLicJG37wuTY+FvNGG80J EtkRj29uprybTcyVUErOc+2HLvpOW/A5AV+T52P3oomWFlZ11n9lrShBwjtRDwS8WuWApW/XR8E 6whK8qTLoQG0zYqYalqMdyvjYyVT7vJ1O0CJgyvy/8Q9mS48y2II4slccJgnKfVe5YBdAJOVCaz F1dppzUooinOELKI6zM/YjVBGx+Vkrq9qe2KagKBLryY/4qTPlRYuKtRZsRWfxwl78K6YKBIeLm NHtYX8R4YNLI8adhxeKENA48eWJkLue1iyi/lT4NIZB4icWhmP6JDD4wQ71fhgERfx1NujvVT1z VXjMMvjcTuLtnA2yHmN0BQ/ZLk80M8dFLxgaUh9h7GEGafJWnMBY1vihKz/WPQLfrVB3GwfjxZi r0RRW0GT9XMT5SXv4GnUqe389fg/tM330p660E1UFa36a8KPl7VnwEp34Tpx1A2Q4Ux4y4SCRN1 kJ1OXp1QX0kQ1a6cKWfyoadwgsuXMngh5XKXT5hXM0fSUTTECTOk4gp/VGe+0geL3XSWiHF5JEl 0ActLvoKZGSekClODcd78bTaiwUoCg2dNFrYIUe0O7rX4kNAsLQRVH5Qe9uEaRJwRS8Wgdb69IF MILf/9wDNPl3PbGKz0E7eSVSKNTJESvzHXg== X-Received: by 2002:a05:600c:8b2c:b0:4a7:a5db:a93e with SMTP id 5b1f17b1804b1-4ac150b3dbfmr345625415e9.4.1793739956406; Tue, 03 Nov 2026 13:05:56 -0800 (PST) Received: from Ansuel-XPS24.localdomain (93-34-90-148.ip49.fastwebnet.it. [93.34.90.148]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-48fed553441sm41850f8f.43.2026.11.03.13.05.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 13:05:55 -0800 (PST) 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 2/2] i2c: mt7621: limit SCL_STRETCH only to Mediatek SoC Date: Tue, 3 Nov 2026 22:05:41 +0100 Message-ID: <20261103210542.15965-2-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261103210542.15965-1-ansuelsmth@gmail.com> References: <20261103210542.15965-1-ansuelsmth@gmail.com> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261103_130558_347378_EB349002 X-CRM114-Status: GOOD ( 18.38 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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 --- Changes v2: - Use match data for storage drivers/i2c/busses/i2c-mt7621.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt7621.c index 0a288c998419..fa1f32d4f046 100644 --- a/drivers/i2c/busses/i2c-mt7621.c +++ b/drivers/i2c/busses/i2c-mt7621.c @@ -57,9 +57,14 @@ /* timeout waiting for I2C devices to respond */ #define TIMEOUT_MS 1000 +struct mtk_i2c_data { + bool have_scl_stretch; +}; + struct mtk_i2c { void __iomem *base; struct device *dev; + const struct mtk_i2c_data *data; struct i2c_adapter adap; u32 bus_freq; u32 clk_div; @@ -83,6 +88,7 @@ static int mtk_i2c_wait_idle(struct mtk_i2c *i2c) static void mtk_i2c_reset(struct mtk_i2c *i2c) { + u32 reg; int ret; ret = device_reset(i2c->adap.dev.parent); @@ -93,8 +99,11 @@ 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 = ((i2c->clk_div << 16) & SM0CTL0_CLK_DIV_MASK) | SM0CTL0_EN; + if (i2c->data->have_scl_stretch) + reg |= SM0CTL0_SCL_STRETCH; + + iowrite32(reg, i2c->base + REG_SM0CTL0_REG); iowrite32(0, i2c->base + REG_SM0CFG2_REG); } @@ -247,8 +256,17 @@ static const struct i2c_algorithm mtk_i2c_algo = { .functionality = mtk_i2c_func, }; +static const struct mtk_i2c_data i2c_mt7621_data = { + .have_scl_stretch = true, +}; + +static const struct mtk_i2c_data i2c_an7581_data = { + .have_scl_stretch = false, +}; + static const struct of_device_id i2c_mtk_dt_ids[] = { - { .compatible = "mediatek,mt7621-i2c" }, + { .compatible = "mediatek,mt7621-i2c", .data = &i2c_mt7621_data }, + { .compatible = "airoha,an7581-i2c", .data = &i2c_an7581_data }, { /* sentinel */ } }; @@ -286,6 +304,7 @@ static int mtk_i2c_probe(struct platform_device *pdev) } i2c->dev = &pdev->dev; + i2c->data = device_get_match_data(&pdev->dev); if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", &i2c->bus_freq)) -- 2.55.0