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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aed13bbbc6sm4471459e87.41.2026.07.08.05.16.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jul 2026 05:16:50 -0700 (PDT) From: Marcus Folkesson Date: Wed, 08 Jul 2026 14:16:17 +0200 Subject: [PATCH v10 5/7] i2c: davinci: add support for setting bus frequency Precedence: bulk X-Mailing-List: linux-kernel@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: <20260708-i2c-mux-v10-5-09dca03c8a15@gmail.com> References: <20260708-i2c-mux-v10-0-09dca03c8a15@gmail.com> In-Reply-To: <20260708-i2c-mux-v10-0-09dca03c8a15@gmail.com> To: Wolfram Sang , Michael Hennerich , Bartosz Golaszewski , Andi Shyti , Andy Shevchenko , Bartosz Golaszewski , Peter Rosin , Peter Rosin Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marcus Folkesson , Bartosz Golaszewski X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3829; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=i0MzyPSyCHemenGFkixpELNTDZX3XPRlllD75eljshA=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBqTj+ots8cu+FKDeonoFwNBgioHD05/dGsQ3jPv g0dgiOw4veJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCak4/qAAKCRCIgE5vWV1S Mhu+EADeGzF68my1I2YE3fmzMrHzVkJDP0KAchf3oIBo2pkG91mfjP7htpTWpt8DvkRkFPSeJfq afoVZ9JAKBNRujeVE8YO24LmeW60z67pXHY4TYmpgeTHwaGQCNRsICgsnGpaxrdCxYwi9jpnPwW mAd0BGOrwTXiC8tjEATc/oXkv2KC0/F7LuuetYIlsmAtAuD5EHslg3LCm+aqlyP1cmocHn1n5BF CUMniC0hguGN75+2cwGgEsMx1gW1Reh26HyLgTnyGV3C6wy6ghRlzvrc/mrITL2eHTvAUgm9YPb /3hZtgU1vPVYba3jiA2jDZqwM7y4bQ4rtS0rpFPlZSJrdQ5/IeEFN7ohqriVfS138XyYZuVd3rs /OGCky9BuD8tAXFxyoBUasl0x5cma06qWcac3O1fm+vVcNDL+5tV7bIsXPbfp2Fw90VHnj9FldY e47Fqnl9cpO6XhB9l0X6Mn9wnct6QXFycg8gf6g4YvN8jGo1PoxyeY92yMv/kEfPliN6775ZL0n bjA9/QwkF0A3XSdkpJiokaDUbtnutIHzML+uGutj6TKXOoTV1mDNaujF1BUTtK5mtzTd6C+Ka+E WJnSK8PUeQ6XD3oq2kReuaNVXwIpOL+logmHm1FySStrbDm76XhR4ou7cdh5AVAg+MsXA79rqFg lj98HqrZ6f2SPIQ== 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 | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 549fb22cdf4f..fd87dc661ecb 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 +169,7 @@ 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 +206,9 @@ 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 +266,7 @@ 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 +278,23 @@ 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); + + /* put I2C into reset */ + davinci_i2c_reset_ctrl(dev, 0); + + /* compute clock dividers */ + adap->clock_hz = clock_hz; + i2c_davinci_calc_clk_dividers(dev); + + /* Take the I2C module out of reset: */ + davinci_i2c_reset_ctrl(dev, 1); + + return clock_hz; +} + /* * This routine does i2c bus recovery by using i2c_generic_scl_recovery * which is provided by I2C Bus recovery infrastructure. @@ -755,12 +771,13 @@ 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 +817,6 @@ 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 +825,7 @@ 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; -- 2.54.0