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[PATCH] I2C: Add support for multiple I2C busses for RTC & DTT 

This patch switches to the desired I2C bus when the date/dtt
commands are called. This can be configured using the
CFG_RTC_BUS_NUM and/or CFG_DTT_BUS_NUM defines.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2007-02-20 10:51:26 +01:00
parent 4037ed3b63
commit 0dc018ece1
4 changed files with 40 additions and 9 deletions
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10
README
View File

@ -1347,6 +1347,16 @@ The following options need to be configured:
If defined, then this indicates the I2C bus number for DDR SPD.
If not defined, then U-Boot assumes that SPD is on I2C bus 0.
CFG_RTC_BUS_NUM
If defined, then this indicates the I2C bus number for the RTC.
If not defined, then U-Boot assumes that RTC is on I2C bus 0.
CFG_DTT_BUS_NUM
If defined, then this indicates the I2C bus number for the DTT.
If not defined, then U-Boot assumes that DTT is on I2C bus 0.
CONFIG_FSL_I2C
Define this option if you want to use Freescale's I2C driver in

14
common/cmd_date.c
View File

@ -27,6 +27,7 @@
#include <common.h>
#include <command.h>
#include <rtc.h>
#include <i2c.h>
DECLARE_GLOBAL_DATA_PTR;
@ -44,6 +45,11 @@ int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
struct rtc_time tm;
int rcode = 0;
int old_bus;
/* switch to correct I2C bus */
old_bus = I2C_GET_BUS();
I2C_SET_BUS(CFG_RTC_BUS_NUM);
switch (argc) {
case 2: /* set date & time */
@ -56,7 +62,7 @@ int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
/* insert new date & time */
if (mk_date (argv[1], &tm) != 0) {
puts ("## Bad date format\n");
return 1;
break;
}
/* and write to RTC */
rtc_set (&tm);
@ -71,11 +77,15 @@ int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
"unknown " : RELOC(weekdays[tm.tm_wday]),
tm.tm_hour, tm.tm_min, tm.tm_sec);
return 0;
break;
default:
printf ("Usage:\n%s\n", cmdtp->usage);
rcode = 1;
}
/* switch back to original I2C bus */
I2C_SET_BUS(old_bus);
return rcode;
}

12
common/cmd_dtt.c
View File

@ -28,19 +28,27 @@
#if (CONFIG_COMMANDS & CFG_CMD_DTT)
#include <dtt.h>
#include <i2c.h>
int do_dtt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
int i;
unsigned char sensors[] = CONFIG_DTT_SENSORS;
int old_bus;
/* switch to correct I2C bus */
old_bus = I2C_GET_BUS();
I2C_SET_BUS(CFG_DTT_BUS_NUM);
/*
* Loop through sensors, read
* temperature, and output it.
*/
for (i = 0; i < sizeof (sensors); i++) {
for (i = 0; i < sizeof (sensors); i++)
printf ("DTT%d: %i C\n", i + 1, dtt_get_temp (sensors[i]));
}
/* switch back to original I2C bus */
I2C_SET_BUS(old_bus);
return 0;
} /* do_dtt() */

3
dtt/adm1021.c
View File

@ -144,6 +144,9 @@ dtt_init (void)
unsigned char sensors[] = CONFIG_DTT_SENSORS;
const char *const header = "DTT: ";
/* switch to correct I2C bus */
I2C_SET_BUS(CFG_DTT_BUS_NUM);
for (i = 0; i < sizeof(sensors); i++) {
if (_dtt_init(sensors[i]) != 0)
printf ("%s%d FAILED INIT\n", header, i+1);