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I2C: add new command i2c reset.

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If I2C Bus is blocked (see doc/I2C_Edge_Conditions),
it is not possible to get out of this, until the
complete Hardware gets a reset. This new commando
calls again i2c_init (and that calls i2c_init_board
if defined), which will deblock the I2C Bus.

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Heiko Schocher 2008-10-15 09:33:30 +02:00 committed by Wolfgang Denk
parent 86e9cdf8c4
commit e43a27c497
1 changed files with 9 additions and 0 deletions
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9
common/cmd_i2c.c
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@ -1182,6 +1182,12 @@ int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
#endif
#if defined(CONFIG_I2C_CMD_TREE)
int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
return 0;
}
#if defined(CONFIG_I2C_MULTI_BUS)
int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
@ -1238,6 +1244,8 @@ int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
return do_i2c_crc(cmdtp, flag, --argc, ++argv);
if (!strncmp(argv[1], "pr", 2))
return do_i2c_probe(cmdtp, flag, --argc, ++argv);
if (!strncmp(argv[1], "re", 2))
return do_i2c_reset(cmdtp, flag, --argc, ++argv);
if (!strncmp(argv[1], "lo", 2))
return do_i2c_loop(cmdtp, flag, --argc, ++argv);
#if defined(CONFIG_CMD_SDRAM)
@ -1266,6 +1274,7 @@ U_BOOT_CMD(
"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
"i2c crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
"i2c probe - show devices on the I2C bus\n"
"i2c reset - re-init the I2C Controller\n"
"i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
#if defined(CONFIG_CMD_SDRAM)
"i2c sdram chip - print SDRAM configuration information\n"