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 B347DEA4FC9 for ; Mon, 23 Feb 2026 14:34:12 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ML132/96OtzaPEHr0g2FW3hc1YN90nAUiFVEwcI9LI0=; b=t9Z8n8SZseNQCOhcDitmd96lib 0Uq7urS4CxcFqAIhkCUawjStV0zE7D2FXdDBJvqX+hOao3vNOmcedkIIe8fLEhuVoA93yuacfYFjC jV7+O6eiYBtPxhJYGlaOm98McORTPmbXCr6ykMmwuGkgNswTxKqMJsLnNk6XeamQqio6KXZiZlAyj bentnpphOcuv13XAX5gQw34YnQijd3PkK7hb82kywIvpmEnqDkzf6YADa8YvGQOPvvYwZOaxEJNFt oU7KJRhAgPbqcnuETpAlgjdW7X/QK9RRReNtLKBvOyCPHatpAnPURwBdgTTJHgZOpUU/xMIswix2A dn2bmm7Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vuX0g-00000000Tcu-14Bt; Mon, 23 Feb 2026 14:34:06 +0000 Received: from mail-lj1-x22e.google.com ([2a00:1450:4864:20::22e]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vuX0V-00000000TVU-3mlp for linux-arm-kernel@lists.infradead.org; Mon, 23 Feb 2026 14:33:57 +0000 Received: by mail-lj1-x22e.google.com with SMTP id 38308e7fff4ca-385bc6910eeso41381441fa.2 for ; Mon, 23 Feb 2026 06:33:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1771857234; x=1772462034; darn=lists.infradead.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=ML132/96OtzaPEHr0g2FW3hc1YN90nAUiFVEwcI9LI0=; b=gfd9jNWtqs//o8tRc5+2Rb8mIDM44u/3zg4+uTjZRz+d5JMXqAI96bX1D6mFd3pjv5 mOBM+b/aQ65qRovDabD/txPQRg5DS1UEcEHRxHm7Ww5obyqz0spB2+mR74+JALmc3f6i rBhsgBipxEfqrKK0jtw4lig1yu8ISqLrW74nKIzNaszzfDGfAd2XVWrlvvLFZnd8aTyu 61YV/6LmMTIIg1VJHVbXEvJ+3UKq4pOlvBnIgQqboRjw0m6Sx5d6eNTmS0wK2OMRnaER GRxEffbbT9Fe95dYtfV3D5mqpMxQZ5YG7pBPjATU2lx3Jvc3w9CNeZVgkezDXU9n37dp WSuw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771857234; x=1772462034; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=ML132/96OtzaPEHr0g2FW3hc1YN90nAUiFVEwcI9LI0=; b=QEm2EJdNjQHLthOsRro2duXeMoiuZbX+wFZu7YL7cL3HtuSW7YHeRXIq1ql9fMGo1Z nAbmgPHyNNNuDHXhRVkaHflZHxUEOKF5FQZuVpqTty6bOtbdaAqE7eKLJaTL8zqHNDIi BJYAQSeWLSvWeq6VB4LoJPpUs9Vr0Q5oKpBhv1NQd4W1KcjaWbmFv6jG2y4NSQSshxT3 8Ug/mvzcX+YI+WNGZrcEsmpu7z8vCJWXY/W2z68ab8L9Gpki2hRDfViaOvzoyt82l96y 1MVoRSo+vxDT6JAmAdf3GQVQmRnyaHoo8zDPklCc+Kck7PkgcUUC15T5P2XZ7QQCA2ZF IRbg== X-Forwarded-Encrypted: i=1; AJvYcCVsZR+Y76mRwTlELhp1+vINLSxVRdJzzJ5O5P8M9PZ8yp347TVwWYOHBBu+dGKvsQFrDJmWfJVpuQMB17Z0RxbS@lists.infradead.org X-Gm-Message-State: AOJu0YyKDSlduv/Ra4Sylln0yxSV9X9s5AJD7RqopyOAbNm4DDHflc+I 2TNHjswftn1ZrMbfglAgy61j1SQOWw+STpA7YhZ7dLI1x/xo8jTBp5tO X-Gm-Gg: AZuq6aLejv6OaN9Orojxebm8LjS84PuDi8kBHPw0ewjM2tJyozf4WA8esZQnL3HyN8B Nspp324AvK0Pr5vlMRlOt/olv0xjz52ZgHcjzzeIizUUqqXVse/npH08+narm+3lb3Vcvz2tR6N gEd0CJnJRkk0bu9mjsDNO2BJvES0ujbnDCFn/Bn003ZTg1KvEaApOrnM9FDiZk5JzYQHzaXs9A8 wzVelis7QlZuSldzgo6RnYhjdU8TtRD2A6zJRTzYQEQt1so9Jaqy9AQH/eEEM4xDPllTskx7vD3 zthPFvlUtHyg5onKnc/LIktPdNL/UadYmRYXLJcyFrP6yW/tjlzbxdCWvJDUX9DJR83pCbBC7kd InuBAFkbyXa5dAUuxffxrWXRffAkISKf2MaKHdR6VA9aYPpXQUoUm5L29x9t7UHb+cw/HSDOhn1 AcwEAqC4aQZtVvgW3LVv9UxSnirwOH9cMEWyaiS0SjCCR0yclv0CUGKRkm+wizEb9cyDb6+3lFd b7CjY0= X-Received: by 2002:a05:6512:68e:b0:59f:6b45:84cd with SMTP id 2adb3069b0e04-5a0ed89c965mr2597861e87.22.1771857233501; Mon, 23 Feb 2026 06:33:53 -0800 (PST) Received: from [192.168.1.135] (83-233-6-197.cust.bredband2.com. [83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a0eeb16344sm1631709e87.37.2026.02.23.06.33.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Feb 2026 06:33:52 -0800 (PST) From: Marcus Folkesson Date: Mon, 23 Feb 2026 15:33:53 +0100 Subject: [PATCH v7 4/5] i2c: davinci: add support for setting bus frequency MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260223-i2c-mux-v7-4-ec75b214718a@gmail.com> References: <20260223-i2c-mux-v7-0-ec75b214718a@gmail.com> In-Reply-To: <20260223-i2c-mux-v7-0-ec75b214718a@gmail.com> To: Wolfram Sang , Peter Rosin , Michael Hennerich , Bartosz Golaszewski , Andi Shyti , Andy Shevchenko , Bartosz Golaszewski Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marcus Folkesson , Bartosz Golaszewski X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3886; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=Rjlezx60T8d1CxFV2XLRaRAysWKBz62yOQI2I7gCYFM=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBpnGVhzIZ66cT2UEVAdWdoZR6qcWocMoWj6ZvKn hmeycXUtVKJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaZxlYQAKCRCIgE5vWV1S MivUEACBk2EPV07U5h65ZnqBjP+Cy+p4X5YZKG6D4zgckGExFXmlEdcRGt7E62qoatNghWgmKzR lggqGF7c+SWIuyG5yZ+EkmViPiiumjqxdVjoP5vAd9X/ntfLcZkeC7+foO8svMqfwa9h9tylvsq he/CgCc+SUT6ou9I2FiwTCiRIPVnGzE0scsXQFbv90PZ4HfIGwRITiVXpaA3Fax2JEM4ha4lt1F Wwa3sqycWdmKpNqnhrIn9cJYN1Edht2beIk26F058Tyni7LrdOchQAlDZMS3f83erTCecv5ycIT BMJnBvxXQuqYN77I7Yl4kcJ3V0eZNQN0RrWrAjH2lNiDhD1O6/gItq9XkTzTDPNDM12qMZ/8ri0 fy/38HH6WhovvX1ddnvk75EGwk9iSaF4aET3+VSe1fxNi1PGm95uySm3ZoAlyjmZC1hzLZwWOv3 awfbuw9yYTbwTD0QsHvbxMztkYYG+f/bwOJI5lRzN4QOp5A50NO91eDPx/uvcYjGRmPcXHWkLQg QRbeoEbSC+bv+3QebrLbUwIbBIQe9Yd8unvHDCrP2SgDLamMfi9RzmdNI5FQY8UCs4gaA1+MV0a 1db9GZAsypspQweAv+J5BWwoLZpuSSCugLu8I98gvX4QZrCr8jlCErAKq1gWwkZfKqlWWbPBs4l 74DcwBD1h5jtkzg== X-Developer-Key: i=marcus.folkesson@gmail.com; a=openpgp; fpr=AB91D46C7E0F6E6FB2AB640EC0FE25D598F6C127 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260223_063355_982358_D0585419 X-CRM114-Status: GOOD ( 17.51 ) 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 Populate adapter with clock_hz and set_clk_freq to enable support for dynamic bus frequency. Remove bus_freq_hz entirely and only use clock_hz instead. Acked-by: Bartosz Golaszewski Signed-off-by: Marcus Folkesson --- drivers/i2c/busses/i2c-davinci.c | 36 +++++++++++++++++++++++++++++------- 1 file changed, 29 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index a2b578e0a534..96b78014aa51 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -132,8 +132,6 @@ struct davinci_i2c_dev { #ifdef CONFIG_CPU_FREQ struct notifier_block freq_transition; #endif - /* standard bus frequency */ - unsigned int bus_freq_hz; /* Chip has a ICPFUNC register */ bool has_pfunc; }; @@ -171,6 +169,8 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) u32 clkh; u32 clkl; u32 input_clock = clk_get_rate(dev->clk); + u32 bus_freq_hz = dev->adapter.clock_hz; + /* NOTE: I2C Clock divider programming info * As per I2C specs the following formulas provide prescaler @@ -207,9 +207,9 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) if (device_is_compatible(dev->dev, "ti,keystone-i2c")) d = 6; - clk = ((input_clock / (psc + 1)) / (dev->bus_freq_hz)); + clk = ((input_clock / (psc + 1)) / (bus_freq_hz)); /* Avoid driving the bus too fast because of rounding errors above */ - if (input_clock / (psc + 1) / clk > dev->bus_freq_hz) + if (input_clock / (psc + 1) / clk > bus_freq_hz) clk++; /* * According to I2C-BUS Spec 2.1, in FAST-MODE LOW period should be at @@ -267,7 +267,7 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev) davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKL_REG)); dev_dbg(dev->dev, "CLKH = %d\n", davinci_i2c_read_reg(dev, DAVINCI_I2C_CLKH_REG)); - dev_dbg(dev->dev, "bus_freq_hz = %dHz\n", dev->bus_freq_hz); + dev_dbg(dev->dev, "bus_freq_hz = %dHz\n", dev->adapter.clock_hz); /* Take the I2C module out of reset: */ @@ -279,6 +279,27 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev) return 0; } +static int davinci_i2c_set_clk(struct i2c_adapter *adap, u32 clock_hz) +{ + struct davinci_i2c_dev *dev = i2c_get_adapdata(adap); + + if (adap->clock_hz == clock_hz) + return 0; + + adap->clock_hz = clock_hz; + + /* put I2C into reset */ + davinci_i2c_reset_ctrl(dev, 0); + + /* compute clock dividers */ + i2c_davinci_calc_clk_dividers(dev); + + /* Take the I2C module out of reset: */ + davinci_i2c_reset_ctrl(dev, 1); + + return 0; +} + /* * This routine does i2c bus recovery by using i2c_generic_scl_recovery * which is provided by I2C Bus recovery infrastructure. @@ -755,12 +776,13 @@ static int davinci_i2c_probe(struct platform_device *pdev) dev->dev = &pdev->dev; dev->irq = irq; platform_set_drvdata(pdev, dev); + adap = &dev->adapter; r = device_property_read_u32(&pdev->dev, "clock-frequency", &prop); if (r) prop = I2C_MAX_STANDARD_MODE_FREQ; - dev->bus_freq_hz = prop; + adap->clock_hz = prop; dev->has_pfunc = device_property_present(&pdev->dev, "ti,has-pfunc"); @@ -800,7 +822,6 @@ static int davinci_i2c_probe(struct platform_device *pdev) goto err_unuse_clocks; } - adap = &dev->adapter; i2c_set_adapdata(adap, dev); adap->owner = THIS_MODULE; adap->class = I2C_CLASS_DEPRECATED; @@ -809,6 +830,7 @@ static int davinci_i2c_probe(struct platform_device *pdev) adap->dev.parent = &pdev->dev; adap->timeout = DAVINCI_I2C_TIMEOUT; adap->dev.of_node = dev_of_node(&pdev->dev); + adap->set_clk_freq = davinci_i2c_set_clk; if (dev->has_pfunc) adap->bus_recovery_info = &davinci_i2c_scl_recovery_info; -- 2.52.0