diff options
| author | Heiko Schocher <hs@denx.de> | 2009-02-24 11:30:37 +0100 |
|---|---|---|
| committer | Kim Phillips <kim.phillips@freescale.com> | 2009-03-05 18:21:17 -0600 |
| commit | c1bce4fff750d734b1fa7467eb08f93902c97ca6 (patch) | |
| tree | 396054d02b41529fb90a4c534d45d01ad912bf91 /drivers/i2c | |
| parent | 19f0e93041dbfe22f8d39b98e4f7f9ea87b77803 (diff) | |
83xx, i2c: add mux support for fsl_i2c
This patch adds I2C mux support for the fsl_i2c driver. This
allows you to add "new" i2c busses, which are reached over
i2c muxes. For more infos, please look in the README and
search for CONFIG_I2C_MUX.
Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index ce646fd7ed..6ab7d3d9fc 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -42,6 +42,9 @@ DECLARE_GLOBAL_DATA_PTR; #define CONFIG_SYS_SPD_BUS_NUM 0 #endif static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = CONFIG_SYS_SPD_BUS_NUM; +#if defined(CONFIG_I2C_MUX) +static unsigned int i2c_bus_num_mux __attribute__ ((section ("data"))) = 0; +#endif static unsigned int i2c_bus_speed[2] = {CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SPEED}; @@ -369,6 +372,19 @@ i2c_probe(uchar chip) int i2c_set_bus_num(unsigned int bus) { +#if defined(CONFIG_I2C_MUX) + if (bus < CONFIG_SYS_MAX_I2C_BUS) { + i2c_bus_num = bus; + } else { + int ret; + + ret = i2x_mux_select_mux(bus); + if (ret) + return ret; + i2c_bus_num = 0; + } + i2c_bus_num_mux = bus; +#else #ifdef CONFIG_SYS_I2C2_OFFSET if (bus > 1) { #else @@ -378,7 +394,7 @@ int i2c_set_bus_num(unsigned int bus) } i2c_bus_num = bus; - +#endif return 0; } @@ -396,7 +412,11 @@ int i2c_set_bus_speed(unsigned int speed) unsigned int i2c_get_bus_num(void) { +#if defined(CONFIG_I2C_MUX) + return i2c_bus_num_mux; +#else return i2c_bus_num; +#endif } unsigned int i2c_get_bus_speed(void) |