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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-596bfa4f8a2sm4342412e87.88.2025.12.02.00.11.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Dec 2025 00:11:13 -0800 (PST) From: Marcus Folkesson Date: Tue, 02 Dec 2025 09:09:51 +0100 Subject: [PATCH RESEND v3 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: <20251202-i2c-mux-v3-4-877dcf478a9f@gmail.com> References: <20251202-i2c-mux-v3-0-877dcf478a9f@gmail.com> In-Reply-To: <20251202-i2c-mux-v3-0-877dcf478a9f@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/ZANAwAKAYiATm9ZXVIyAcsmYgBpLp8Qi2I962N48ZEi7OQaJbPonP2RofpIcDdIF Qc2stjpsfaJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaS6fEAAKCRCIgE5vWV1S MpjuD/9HEkKWHOP0IZvSLXAbb4TgULotS/GvAHKuELjbV+pQuEp20j6vtDCA6wZCj06iSNZ9ePR ek8ISCZzlQIutSBTaZNKOu4nQdehiSt2CksmXna0GE9ZQykzpoBaaxqgUF5GPGIjKO3l2CYbKXo 0xU0lSoXtu1g0nHau5Pmh5YiAq8ATCyfGmIrdZ2xvadty8mnbmjsoZjzs0IorM8vBw2TnsaRGqo 2HlE8c9ZsuGKLMe2qsea1LyC+keoiQJYwaDta95B6Ertzb8SSlgQYebIt5lDQwwi2O0TkRgO8jY emFyvKGvc7LDIkUwT/0Op48swG7+Fq1NFoeDyDjzTbBqqMXdGnCP7/W5P3/UFA4Q+VBdLI2McOs PvO0M9Px1ZizYBOG3fhDr2y62s8FEQ8tolg3sdnPqYreWGVzpyMhP6rVGtL7jcClL/uyKX+X604 2Cd5p8n6skJuD8+mFxR+l/+dA9w58wrEQ/6VoTFIc1JH5neJ7JJZ+B9gEJ3onGZS9vweV6PrXRY nIM8FBphBbhuasC/rr9G+v+S7R/az0xJg0Lf6fp7l05klJGTKWM1U0rU/tMOp9EcurPPYNKc7hy x3WAJmuNP5NFXrcYPb57XNRuBE87aDHZYe/Y4tMclQPW0488mVo46NRjY2qXDnqZ8eICurOxJja qVdsLXxWV4ZU6WA== 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-20251202_001117_080468_8574FDD5 X-CRM114-Status: GOOD ( 13.83 ) 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 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