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Message-Id: <20251002-i2c-mux-v2-4-b698564cd956@gmail.com>
Date: Thu, 02 Oct 2025 16:41:35 +0200
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>,
Peter Rosin <peda@...ntia.se>,
Michael Hennerich <michael.hennerich@...log.com>,
Bartosz Golaszewski <brgl@...ev.pl>, Andi Shyti <andi.shyti@...nel.org>
Cc: linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Marcus Folkesson <marcus.folkesson@...il.com>,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v2 4/5] i2c: davinci: add support for setting bus frequency
Populate adapter with clock_hz and set_clk_freq to enable support for
dynamic bus frequency.
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
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
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