{"id":2215399,"url":"http://patchwork.ozlabs.org/api/patches/2215399/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-i2c/patch/20260324-i2c-mux-v9-4-5292b0608243@gmail.com/","project":{"id":35,"url":"http://patchwork.ozlabs.org/api/projects/35/?format=json","name":"Linux I2C development","link_name":"linux-i2c","list_id":"linux-i2c.vger.kernel.org","list_email":"linux-i2c@vger.kernel.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260324-i2c-mux-v9-4-5292b0608243@gmail.com>","list_archive_url":null,"date":"2026-03-24T13:54:18","name":"[v9,4/5] i2c: davinci: add support for setting bus frequency","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"688826997c82c94298ecf2f8a1cfcd36e9fe81ca","submitter":{"id":46679,"url":"http://patchwork.ozlabs.org/api/people/46679/?format=json","name":"Marcus Folkesson","email":"marcus.folkesson@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-i2c/patch/20260324-i2c-mux-v9-4-5292b0608243@gmail.com/mbox/","series":[{"id":497295,"url":"http://patchwork.ozlabs.org/api/series/497295/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-i2c/list/?series=497295","date":"2026-03-24T13:54:14","name":"I2C Mux per channel bus speed","version":9,"mbox":"http://patchwork.ozlabs.org/series/497295/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2215399/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2215399/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-i2c@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=ZHmvppdX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","Message-Id":"<20260324-i2c-mux-v9-4-5292b0608243@gmail.com>","References":"<20260324-i2c-mux-v9-0-5292b0608243@gmail.com>","In-Reply-To":"<20260324-i2c-mux-v9-0-5292b0608243@gmail.com>","To":"Wolfram Sang ,\n Peter Rosin ,\n Michael Hennerich ,\n Bartosz Golaszewski , Andi Shyti ,\n Andy Shevchenko ,\n Bartosz Golaszewski ","Cc":"linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-arm-kernel@lists.infradead.org,\n Marcus Folkesson ,\n Bartosz Golaszewski ","X-Mailer":"b4 0.14.3","X-Developer-Signature":"v=1; a=openpgp-sha256; l=3881;\n i=marcus.folkesson@gmail.com; h=from:subject:message-id;\n bh=ryrI9MAQVwCIRRCngn0KDdHz7g1aMSsslONZvQCRx8g=;\n b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBpwpecpKtb2LQM74bmvDz0req+77DcvmlflCxyE\n W4Thx+y7rWJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCacKXnAAKCRCIgE5vWV1S\n MlCUD/wPBVoCUV1xDm82HsdePvpFTI2QRLF6oP9tMPcFfNn5gKnix7i6IZSK70o5JGbRZP2Oqt0\n krIWM96uzXsZY1ahQOTrC//PEKTVZLYgv8Lek7pJ8fNJV70Nd2DzkaovUlBXeGWQUeHcSX0rrc2\n jw8muH/LXYI4RgA3nxwZlX3lLNEb0nNbxv/rDf0jYPs+j9mcGXH0WnRwsoVv1JO/UovW6am8AkH\n tvgbfHNliDmVpPJPeE6U4SxgwY8Otxk3b7cw7L1y2bcqxDZFIzflpxzuNNkQj5DnW+llnIAzgP0\n sjO8H0ms1lOrTt5+f4i3I9gWz5CAdvaAmZwbG0n5JEwpG1CI5BnJVlFMwld+yEJBaU4HyAexUOY\n SnRNTR5ot1h1CREUoKB90y7hEflr+pzSwtaqZNYhU2WtZAYyqB7HRwV0TpoCOUGhndf0HXHMqyJ\n iljSssZsBtgHzvWyxdh885YIt54nIFeggj3YJs8prKmAiM305wftGDGIK2xLfY+IMdwQq/cJAPq\n +/5/7exap9aoXdqA8WVdd/gAnHS4L0bLoN7UzcALDmF4Am49BXowNySUrTaEqHHiQfTMe5uDwlE\n L7+KTQ7rWJCda0niD3xovRf+f7DUKsLQsSep5U2cweJQW4WJ0R5W443R0ez0yJwVRLlnoxAR3m7\n UorDwjz3rJvMstw==","X-Developer-Key":"i=marcus.folkesson@gmail.com; a=openpgp;\n fpr=AB91D46C7E0F6E6FB2AB640EC0FE25D598F6C127"},"content":"Populate adapter with clock_hz and .set_clk_freq() to enable support for\ndynamic bus frequency.\n\nRemove bus_freq_hz entirely and only use clock_hz instead.\n\nAcked-by: Bartosz Golaszewski \nSigned-off-by: Marcus Folkesson \n---\n drivers/i2c/busses/i2c-davinci.c | 35 ++++++++++++++++++++++++++++-------\n 1 file changed, 28 insertions(+), 7 deletions(-)","diff":"diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c\nindex 549fb22cdf4f..d87172408445 100644\n--- a/drivers/i2c/busses/i2c-davinci.c\n+++ b/drivers/i2c/busses/i2c-davinci.c\n@@ -132,8 +132,6 @@ struct davinci_i2c_dev {\n #ifdef CONFIG_CPU_FREQ\n \tstruct notifier_block\tfreq_transition;\n #endif\n-\t/* standard bus frequency */\n-\tunsigned int\t\tbus_freq_hz;\n \t/* Chip has a ICPFUNC register */\n \tbool\t\t\thas_pfunc;\n };\n@@ -171,6 +169,7 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)\n \tu32 clkh;\n \tu32 clkl;\n \tu32 input_clock = clk_get_rate(dev->clk);\n+\tu32 bus_freq_hz = dev->adapter.clock_hz;\n \n \t/* NOTE: I2C Clock divider programming info\n \t * As per I2C specs the following formulas provide prescaler\n@@ -207,9 +206,9 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)\n \tif (device_is_compatible(dev->dev, \"ti,keystone-i2c\"))\n \t\td = 6;\n \n-\tclk = (input_clock / (psc + 1)) / (dev->bus_freq_hz);\n+\tclk = (input_clock / (psc + 1)) / (bus_freq_hz);\n \t/* Avoid driving the bus too fast because of rounding errors above */\n-\tif (input_clock / (psc + 1) / clk > dev->bus_freq_hz)\n+\tif (input_clock / (psc + 1) / clk > bus_freq_hz)\n \t\tclk++;\n \t/*\n \t * According to I2C-BUS Spec 2.1, in FAST-MODE LOW period should be at\n@@ -267,7 +266,7 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev)\n \t\tdavinci_i2c_read_reg(dev, DAVINCI_I2C_CLKL_REG));\n \tdev_dbg(dev->dev, \"CLKH = %d\\n\",\n \t\tdavinci_i2c_read_reg(dev, DAVINCI_I2C_CLKH_REG));\n-\tdev_dbg(dev->dev, \"bus_freq_hz = %dHz\\n\", dev->bus_freq_hz);\n+\tdev_dbg(dev->dev, \"bus_freq_hz = %dHz\\n\", dev->adapter.clock_hz);\n \n \n \t/* Take the I2C module out of reset: */\n@@ -279,6 +278,27 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev)\n \treturn 0;\n }\n \n+static int davinci_i2c_set_clk(struct i2c_adapter *adap, u32 clock_hz)\n+{\n+\tstruct davinci_i2c_dev *dev = i2c_get_adapdata(adap);\n+\n+\tif (adap->clock_hz == clock_hz)\n+\t\treturn 0;\n+\n+\tadap->clock_hz = clock_hz;\n+\n+\t/* put I2C into reset */\n+\tdavinci_i2c_reset_ctrl(dev, 0);\n+\n+\t/* compute clock dividers */\n+\ti2c_davinci_calc_clk_dividers(dev);\n+\n+\t/* Take the I2C module out of reset: */\n+\tdavinci_i2c_reset_ctrl(dev, 1);\n+\n+\treturn 0;\n+}\n+\n /*\n * This routine does i2c bus recovery by using i2c_generic_scl_recovery\n * which is provided by I2C Bus recovery infrastructure.\n@@ -755,12 +775,13 @@ static int davinci_i2c_probe(struct platform_device *pdev)\n \tdev->dev = &pdev->dev;\n \tdev->irq = irq;\n \tplatform_set_drvdata(pdev, dev);\n+\tadap = &dev->adapter;\n \n \tr = device_property_read_u32(&pdev->dev, \"clock-frequency\", &prop);\n \tif (r)\n \t\tprop = I2C_MAX_STANDARD_MODE_FREQ;\n \n-\tdev->bus_freq_hz = prop;\n+\tadap->clock_hz = prop;\n \n \tdev->has_pfunc = device_property_present(&pdev->dev, \"ti,has-pfunc\");\n \n@@ -800,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)\n \t\tgoto err_unuse_clocks;\n \t}\n \n-\tadap = &dev->adapter;\n \ti2c_set_adapdata(adap, dev);\n \tadap->owner = THIS_MODULE;\n \tadap->class = I2C_CLASS_DEPRECATED;\n@@ -809,6 +829,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)\n \tadap->dev.parent = &pdev->dev;\n \tadap->timeout = DAVINCI_I2C_TIMEOUT;\n \tadap->dev.of_node = dev_of_node(&pdev->dev);\n+\tadap->set_clk_freq = davinci_i2c_set_clk;\n \n \tif (dev->has_pfunc)\n \t\tadap->bus_recovery_info = &davinci_i2c_scl_recovery_info;\n","prefixes":["v9","4/5"]}