[PATCH v2 3/5] i2c: add I2C_AQ_NO_CLK_STRETCH to i2c-bcm2835.c

[Nicola Corna]

As reported here
http://www.advamation.com/knowhow/raspberrypi/rpi-i2c-bug.html
and confirmed here
https://www.raspberrypi.org/forums/viewtopic.php?p=146272
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 at corna.info>
---
 drivers/i2c/busses/i2c-bcm2835.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index 3032b89..38d7102 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -222,6 +222,10 @@ static const struct i2c_algorithm bcm2835_i2c_algo = {
 	.functionality	= bcm2835_i2c_func,
 };
 
+static const struct i2c_adapter_quirks bcm2835_i2c_quirks = {
+	.flags = I2C_AQ_NO_CLK_STRETCH,
+};
+
 static int bcm2835_i2c_probe(struct platform_device *pdev)
 {
 	struct bcm2835_i2c_dev *i2c_dev;
@@ -293,6 +297,7 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 	adap->algo = &bcm2835_i2c_algo;
 	adap->dev.parent = &pdev->dev;
 	adap->dev.of_node = pdev->dev.of_node;
+	adap->quirks = &bcm2835_i2c_quirks;
 
 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, 0);
 
-- 
2.6.1