[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>

diff --git a/README b/README
index ecfd1f8..1542864 100644 (file)
--- a/README
+++ b/README
@@ -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

diff --git a/common/cmd_date.c b/common/cmd_date.c
index 84932f7..33d2e56 100644 (file)
--- a/common/cmd_date.c
+++ b/common/cmd_date.c
@@ -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;
 }
 

diff --git a/common/cmd_dtt.c b/common/cmd_dtt.c
index 9db64e9..4f7b049 100644 (file)
--- a/common/cmd_dtt.c
+++ b/common/cmd_dtt.c
@@ -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() */

diff --git a/dtt/adm1021.c b/dtt/adm1021.c
index 14c38f0..9f65cfb 100644 (file)
--- a/dtt/adm1021.c
+++ b/dtt/adm1021.c
@@ -144,12 +144,15 @@ 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);
-           else
-               printf ("%s%d is %i C\n", header, i+1,
-                      dtt_get_temp(sensors[i]));
+               if (_dtt_init(sensors[i]) != 0)
+                       printf ("%s%d FAILED INIT\n", header, i+1);
+               else
+                       printf ("%s%d is %i C\n", header, i+1,
+                               dtt_get_temp(sensors[i]));
        }
 
        return (0);