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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-58b0119e60fsm884712e87.94.2025.10.02.07.42.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Oct 2025 07:42:16 -0700 (PDT) From: Marcus Folkesson Date: Thu, 02 Oct 2025 16:41:35 +0200 Subject: [PATCH v2 4/5] i2c: davinci: add support for setting bus frequency MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251002-i2c-mux-v2-4-b698564cd956@gmail.com> References: <20251002-i2c-mux-v2-0-b698564cd956@gmail.com> In-Reply-To: <20251002-i2c-mux-v2-0-b698564cd956@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/ZANAwAKAYiATm9ZXVIyAcsmYgBo3o84HWKLdePi9d7Tc2PXy/ubOIvh9PDmJUI93 qBA7BYJFC6JAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaN6POAAKCRCIgE5vWV1S Msb+EADCHGLcNzYBswSFO9dObGRTq+GinFNvJi1Xknuw5pbEsMWNSeUHZO/frQMkN2WBh/bZXPn avl/25KjZ2kLk31+G3MYQoQLfJ+rF/Zo9h1JtYZqtbVlE5PKYtbWIaUaw1kl/d0q5HKMt7YHL8r Da29RmFGTWQ8uJKcUynIvk/VRZPTHehK5lRo/D33kuSZPtQ4lzHJ6Pl9aEGzegukAi0QlizBJyI xhl5Yoq1gsRdJjxLZvL15jX0Ohw9xc3mvkL8pSRd92zB5M06TZX5B5Q4w/+WydkgWrpBjzSocqX bh+Lzq30gHjtmDitCM1WL5BSE85Tize4E8StL6gO8A5RxkmcZX0RUxYorO1vIgqIh0d1+Pn0rQ4 k0kPZ7ymJ9bt/Yet8S/qfkpIZmEkIGHAwGPphM3wXnYr6yF6oYXg4PaT3c5swKe4y6jeNtc/Qsx 57kT2Q77aPPsW6pjPVrKcNaKsrJa3Ub0raMYm07sWvUnJxAry9np3ViFl/jGMZ2VOsf95NLcpLQ 3CGiwzg7UmikygJC6xwPKFtsUKqsiiMZMRUslJHwx1dcnxXtXvWHapivkPIENm1VVhLb3u7+UMP 6i+F87YEJilujFQm+zW0rBIjuOFvd9To6gLjrveIMlp5TojCJkfAYq3wnAkNfHEjLAL6nfxIS2N uWqLK377NiLQPow== X-Developer-Key: i=marcus.folkesson@gmail.com; a=openpgp; fpr=AB91D46C7E0F6E6FB2AB640EC0FE25D598F6C127 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251002_074219_276189_DCDFE2AC X-CRM114-Status: GOOD ( 14.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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