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-rw-r--r--common/cmd_i2c.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index b59470e7f6..82e63e1322 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -605,18 +605,28 @@ mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char * const arg
/*
* Syntax:
- * i2c probe {addr}{.0, .1, .2}
+ * i2c probe {addr}
+ *
+ * Returns zero (success) if one or more I2C devices was found
*/
static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int j;
+ int addr = -1;
+ int found = 0;
#if defined(CONFIG_SYS_I2C_NOPROBES)
int k, skip;
uchar bus = GET_BUS_NUM;
#endif /* NOPROBES */
+ if (argc == 2)
+ addr = simple_strtol(argv[1], 0, 16);
+
puts ("Valid chip addresses:");
for (j = 0; j < 128; j++) {
+ if ((0 <= addr) && (j != addr))
+ continue;
+
#if defined(CONFIG_SYS_I2C_NOPROBES)
skip = 0;
for (k=0; k < NUM_ELEMENTS_NOPROBE; k++) {
@@ -628,8 +638,10 @@ static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
if (skip)
continue;
#endif
- if (i2c_probe(j) == 0)
+ if (i2c_probe(j) == 0) {
printf(" %02X", j);
+ found++;
+ }
}
putc ('\n');
@@ -642,7 +654,7 @@ static int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
putc ('\n');
#endif
- return 0;
+ return (0 == found);
}
/*
@@ -1380,7 +1392,7 @@ U_BOOT_CMD(
"i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
"i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
- "i2c probe - show devices on the I2C bus\n"
+ "i2c probe [address] - test for and show device(s) on the I2C bus\n"
"i2c read chip address[.0, .1, .2] length memaddress - read to memory \n"
"i2c write memaddress chip address[.0, .1, .2] length - write memory to i2c\n"
"i2c reset - re-init the I2C Controller\n"