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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-377a921ae62sm18863341fa.21.2025.10.20.00.18.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Oct 2025 00:18:01 -0700 (PDT) From: Marcus Folkesson Date: Mon, 20 Oct 2025 09:17:27 +0200 Subject: [PATCH v3 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: <20251020-i2c-mux-v3-4-908ac5cf9223@gmail.com> References: <20251020-i2c-mux-v3-0-908ac5cf9223@gmail.com> In-Reply-To: <20251020-i2c-mux-v3-0-908ac5cf9223@gmail.com> To: Wolfram Sang , Peter Rosin , Michael Hennerich , Bartosz Golaszewski , Andi Shyti Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marcus Folkesson , Bartosz Golaszewski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1680; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=SEKtq8WlaDinzaqN6sbmXex+0jo1iDkPy6Zh0RvgHvU=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBo9eIZ1Jf69x3LAuim1DypUebtkcRfpVSMEi+DS CMACgQmyliJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaPXiGQAKCRCIgE5vWV1S MoKdD/968DvG23fzIcVGZGpsOk49d/VnVy7WOHLZ1aymMwSR226Np+PcY3TW95V8f0lrR0BfWfC GZoxRRTcYiVCH8SMN2YnKcJFISC5/aTE4pcOwvrIKGMj0qOf8QFuH3wEHjAHOgtPwKhqb0tu/bd 8FXDShyfUiR8poUbWGZhdw3OhzrjdTApQc++Lydmlb4QiF9eB8p1gu+Hk6LtyOS4AOFr2VeA7tS PcltmLnDsNAZPGxFxqBvScGfXpijOnmShj3NDXSVdR25VbpHy04sYPxLfoJc5eW8MM02ef3aBdi xuQYjPXvVlDXF893/AG1mcEO68CoSBXN6RHcVCNlDEa4YHl6ztpASahiMpyrOqyt5KI2zwUxE8E 1TBi9CG22ppH1Mk2qpXY3hX73i+s3h1JWg9cEUH1Fps5nHROoWIsm9Ot+WiDWKo6T8+KcHJY9df ehIalq+w09UyIrpC+qHd1h673ADHbnSIVdRuQ/B0lh6RX5so1uqWwt6WbMa4CgC+LhacwwChb0N tznonRbF3lm6a2hymMgR0huj6TEWHKoZPt7kfmlAnEOYzMmrUROjZnhqxnHR1LL9K6t4g6gGxPo 8P7LXYkkC8CaVx8ODOLAxAzNXfvvmsNB5z/Er/9icX/OD9YLfxCM3DZn1veaSZkYlt3RE96d9cf R0Tju8jd1zleopg== 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. Acked-by: Bartosz Golaszewski Signed-off-by: Marcus Folkesson --- drivers/i2c/busses/i2c-davinci.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 82f295619c4d0ef108c57d13c10004aa25014cbf..fdde573eb59d11a7c6a87141863df1b9b58f64fd 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -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 (dev->bus_freq_hz == clock_hz) + return 0; + + dev->bus_freq_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. @@ -810,6 +831,8 @@ 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->clock_hz = dev->bus_freq_hz; + adap->set_clk_freq = davinci_i2c_set_clk; if (dev->has_pfunc) adap->bus_recovery_info = &davinci_i2c_scl_recovery_info; -- 2.50.1