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GET /api/patches/2196891/?format=api
{ "id": 2196891, "url": "http://patchwork.ozlabs.org/api/patches/2196891/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260216-i2c-mux-v6-4-9be28ecfd7e3@gmail.com/", "project": { "id": 35, "url": "http://patchwork.ozlabs.org/api/projects/35/?format=api", "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": "<20260216-i2c-mux-v6-4-9be28ecfd7e3@gmail.com>", "list_archive_url": null, "date": "2026-02-16T12:38:16", "name": "[v6,4/5] i2c: davinci: add support for setting bus frequency", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "62eb0999e4620f41aad8cda4d172831ed0d15f52", "submitter": { "id": 46679, "url": "http://patchwork.ozlabs.org/api/people/46679/?format=api", "name": "Marcus Folkesson", "email": "marcus.folkesson@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260216-i2c-mux-v6-4-9be28ecfd7e3@gmail.com/mbox/", "series": [ { "id": 492305, "url": "http://patchwork.ozlabs.org/api/series/492305/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=492305", "date": "2026-02-16T12:38:13", "name": "I2C Mux per channel bus speed", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/492305/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196891/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196891/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-i2c+bounces-16014-incoming=patchwork.ozlabs.org@vger.kernel.org>", "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=20230601 header.b=QtevYd0C;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260216-i2c-mux-v6-4-9be28ecfd7e3@gmail.com>", "References": "<20260216-i2c-mux-v6-0-9be28ecfd7e3@gmail.com>", "In-Reply-To": "<20260216-i2c-mux-v6-0-9be28ecfd7e3@gmail.com>", "To": "Wolfram Sang <wsa+renesas@sang-engineering.com>,\n Peter Rosin <peda@axentia.se>,\n Michael Hennerich <michael.hennerich@analog.com>,\n Bartosz Golaszewski <brgl@bgdev.pl>, Andi Shyti <andi.shyti@kernel.org>,\n Andy Shevchenko <andriy.shevchenko@intel.com>,\n Bartosz Golaszewski <brgl@kernel.org>", "Cc": "linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-arm-kernel@lists.infradead.org,\n Marcus Folkesson <marcus.folkesson@gmail.com>,\n Bartosz Golaszewski <brgl@kernel.org>", "X-Mailer": "b4 0.14.3", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=4136;\n i=marcus.folkesson@gmail.com; h=from:subject:message-id;\n bh=FZLb5XRyW3qJmkpIPIeOUrGpSdB/lOwxjtGV8G6aT1w=;\n b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBpkw/SjhxPbOdl6PzzFXxkG7V00Yfw6LrO32v8G\n AJ5G3J/oZaJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaZMP0gAKCRCIgE5vWV1S\n MuWAD/sEgcqRDjfv4dBtPGn2rMygDHEQ/WhM8LZZY/ZsUdTu9IEazfaetDhsq19yVFasDasuKDN\n DsYRv1P0iG0tx5+MlZkmLfN/5UETYd/30vekBJhObSat5hw6ipvIhKzQG9pPCIJ+T5K5yhRhITn\n KU1Bt0hFa+0TF4vhsVUfP0pgEEsdTUDu/b7b0LZIv5hCUbk1pv56Y0uM65puMV8FuIh+4MH1Pkl\n 8q4lVmWLYnbUEevmJTy3eEHw+BTKzwAf6NnpVAZL8MZd8e8+jdZkZbGMUdTfmIsMKb+GQZ/9Y3h\n rArQXnWUk/5sOPLjlwlMe5hBpv16OmHWtjkJ6e0U3mUBzEHYtlNpZ/T1Mmh8JYVMwIyA4QJAJdM\n dWrqg9RbU8x+499vybmgDvEaDqG/4O916z0m1G4mXHJ3cus79TG2Mt3Px8821pcBdxEoA/5QRPE\n dMmaylJHuhoBgEgAOkufNDCMbbFWI/xF/lXnN5QFUlOKsR5c3BI7OZ8F/q9gF0x4uEGRtEnkYjl\n SmtX+sYiLL/WDiNd+tTD/4Q0W3vbS7c7sGjeAlLk9tv5nR9Cj2kMz8qi3jHLFtQtcy+CRzm3Ij9\n R3K6H+G6lIuuHpi/0pBxr13dJSVrUk8cTbSJWAU00Yi0MNC6zTaBMcg8nmqx9yDLb88ehl1xQAZ\n 7m+FV3jxrMt5h7Q==", "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 <bartosz.golaszewski@linaro.org>\nSigned-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>\n---\n drivers/i2c/busses/i2c-davinci.c | 38 ++++++++++++++++++++++++++++++--------\n 1 file changed, 30 insertions(+), 8 deletions(-)", "diff": "diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c\nindex 761de5a814df..ca41e6d6b623 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 +169,8 @@ 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 \n \t/* NOTE: I2C Clock divider programming info\n \t * As per I2C specs the following formulas provide prescaler\n@@ -207,16 +207,16 @@ 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 \t * least 1.3uS, which is not the case with 50% duty cycle. Driving HIGH\n \t * to LOW ratio as 1 to 2 is more safe.\n \t */\n-\tif (dev->bus_freq_hz > 100000)\n+\tif (bus_freq_hz > 100000)\n \t\tclkl = (clk << 1) / 3;\n \telse\n \t\tclkl = (clk >> 1);\n@@ -267,7 +267,7 @@ 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 +279,27 @@ 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 +776,13 @@ 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 +822,6 @@ 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 +830,7 @@ 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": [ "v6", "4/5" ] }