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83xx, i2c: add mux support for fsl_i2c

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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>
This commit is contained in:
Heiko Schocher 2009-02-24 11:30:37 +01:00 committed by Kim Phillips
parent 19f0e93041
commit c1bce4fff7
1 changed files with 21 additions and 1 deletions
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22
drivers/i2c/fsl_i2c.c
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@ -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)