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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-59580405693sm3023727e87.76.2025.11.17.01.05.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Nov 2025 01:05:40 -0800 (PST) From: Marcus Folkesson Date: Mon, 17 Nov 2025 10:05:01 +0100 Subject: [PATCH RESEND v3 4/5] 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: <20251117-i2c-mux-v3-4-696c83e3505a@gmail.com> References: <20251117-i2c-mux-v3-0-696c83e3505a@gmail.com> In-Reply-To: <20251117-i2c-mux-v3-0-696c83e3505a@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 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1624; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=PGfDlWvGSscBxbVs8v8ZTNXGs8v6TwzoMOGQNHx4lNY=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBpGuVTmbEPDBw0DGf55nTkqQfPY0aSmJczmJdzL udfzpVwpD6JAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaRrlUwAKCRCIgE5vWV1S MsrDD/99RIw+4GMeSZBAZdqbftN+a6QrefWaPyYXbQfwN0gTMDTGL2lUdqnPRz5XYrpBrI+8zJX 16Kg3VPRKo/si9YBXKjljakdIpkViF/LhRm6VE/s5f6KjUEZa5K82ZILREWEVEcUJBeblUPSpb3 c9btZcefJ8AmMyAWmiAAXdeUrNJV0ecpmZJn8yROfFp6BF5h8J/v1NYWGgbizI2a/6njFui/lKM Yh1Yv1MQgPXx9xpZLNCDiV1ATrxcIT83Cz1FOwC6/5ev7oTd82cmNhbhf28dWeY6Hs7185mmUGm B+9ZhV7/bGSzLiu5u43DI2npMiIa3+wkxxfVtr/ovLZhdNXUcf5mIUHmdaTZsZvEeEk/5JEj/UB FyDEfFK+63Z/0RbkCMdMAFvnclG9bUZbYBctMKgtQCFnabtupVPifRKka2oeS6jXa7TPdXyIblq ORizRSo+drE39m76lmL4SDmjh1wGj2mGsz5QdqN/qD9H9YmSxC5xDb+9KJ2ccIc2lMNw+CeaQxt 1GR8DgS6yTBGfnS4JmsvtE+lwT48Rgl4k5hT3U7lmGoDqn7zjMdSwNPga0JsoxWbK7yJ2qT2SbE DUVQjvExQizKAWxq/AhLfgZDdTtzA5BpMxxoxgzaZzxqtcP01uB55BH/O8WxuVhFfRx9uu+I/Q6 I+bVBUkrzPsFGMg== 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 82f295619c4d..fdde573eb59d 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; -- 2.51.2