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[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 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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