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| author | Armando Visconti <armando.visconti@st.com> | 2012-12-06 00:04:16 +0000 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2012-12-11 13:17:32 -0700 |
| commit | 491739bb7456b95bb863421f6cd76af0ff9b797c (patch) | |
| tree | c2bfb6e77985079fc24794cc1c512d621a268000 /drivers/i2c/designware_i2c.h | |
| parent | ac6e2fe6e4afe54a9c7ef0d93827a86e264814f2 (diff) | |
| download | u-boot-imx-491739bb7456b95bb863421f6cd76af0ff9b797c.zip u-boot-imx-491739bb7456b95bb863421f6cd76af0ff9b797c.tar.gz u-boot-imx-491739bb7456b95bb863421f6cd76af0ff9b797c.tar.bz2 | |
designware_i2c: Added s/w generation of stop bit
In the newer versions of designware i2c IP there is the possibility
of configuring it with IC_EMPTYFIFO_HOLD_MASTER_EN=1, which basically
requires the s/w to generate the stop bit condition directly, as
the h/w will not automatically generate it when TX_FIFO is empty.
To avoid generation of an extra 0x0 byte sent as data, the
IC_STOP command must be sent along with the last IC_CMD.
This patch always writes bit[9] of ic_data_cmd even in the
older versions, assuming that it is a noop there.
Signed-off-by: Armando Visconti <armando.visconti@st.com>
Diffstat (limited to 'drivers/i2c/designware_i2c.h')
| -rw-r--r-- | drivers/i2c/designware_i2c.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/i2c/designware_i2c.h b/drivers/i2c/designware_i2c.h index 03b520e..e004152 100644 --- a/drivers/i2c/designware_i2c.h +++ b/drivers/i2c/designware_i2c.h @@ -95,6 +95,7 @@ struct i2c_regs { /* i2c data buffer and command register definitions */ #define IC_CMD 0x0100 +#define IC_STOP 0x0200 /* i2c interrupt status register definitions */ #define IC_GEN_CALL 0x0800 |