i2c: bcm2835: add I2C_AQ_NO_CLK_STRETCH
As reported in the links given below. the BCM2835 has a hardware bug in its i2c module which prevents a correct clock stretching. This patch adds the I2C_AQ_NO_CLK_STRETCH quirk flag to i2c-bcm2835. Signed-off-by: Nicola Corna <nicola@corna.info> [wsa: put the links into the code as comments] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -222,6 +222,15 @@ static const struct i2c_algorithm bcm2835_i2c_algo = {
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.functionality = bcm2835_i2c_func,
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};
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/*
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* This HW was reported to have problems with clock stretching:
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* http://www.advamation.com/knowhow/raspberrypi/rpi-i2c-bug.html
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* https://www.raspberrypi.org/forums/viewtopic.php?p=146272
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*/
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static const struct i2c_adapter_quirks bcm2835_i2c_quirks = {
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.flags = I2C_AQ_NO_CLK_STRETCH,
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};
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static int bcm2835_i2c_probe(struct platform_device *pdev)
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{
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struct bcm2835_i2c_dev *i2c_dev;
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@ -293,6 +302,7 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
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adap->algo = &bcm2835_i2c_algo;
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adap->dev.parent = &pdev->dev;
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adap->dev.of_node = pdev->dev.of_node;
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adap->quirks = &bcm2835_i2c_quirks;
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bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, 0);
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