forked from Minki/linux
i2c: omap: add notes related to i2c multimaster mode
No functional changes. Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -299,6 +299,12 @@ static void __omap_i2c_init(struct omap_i2c_dev *dev)
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/* Take the I2C module out of reset: */
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omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
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/*
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* NOTE: right after setting CON_EN, STAT_BB could be 0 while the
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* bus is busy. It will be changed to 1 on the next IP FCLK clock.
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* udelay(1) will be enough to fix that.
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*/
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/*
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* Don't write to this register if the IE state is 0 as it can
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* cause deadlock.
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@ -660,7 +666,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
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if (!dev->b_hw && stop)
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w |= OMAP_I2C_CON_STP;
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/*
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* NOTE: STAT_BB bit could became 1 here if another master occupy
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* the bus. IP successfully complete transfer when the bus will be
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* free again (BB reset to 0).
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*/
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omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
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/*
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