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cmd_eeprom: make it possible to define the used i2c bus

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A SoC like the i.MX6 supports more then one i2c bus. In oder to be
able to use the eeprom command add a new define to specify the
i2c bus to use. If CONFIG_SYS_I2C_EEPROM_BUS is not defined there
is no functional change, else a call to i2c_set_bus_num(..) is
done before calling i2c_read(..) and i2c_write(..).

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Christian Gmeiner 2015-02-11 15:19:31 +01:00 committed by Stefano Babic
parent 83dd1dd91c
commit 189d257b7a
2 changed files with 9 additions and 0 deletions
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3
README
View File

@ -4341,6 +4341,9 @@ to save the current settings.
If defined, specified the chip address of the EEPROM device.
The default address is zero.
- CONFIG_SYS_I2C_EEPROM_BUS:
If defined, specified the i2c bus of the EEPROM device.
- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
If defined, the number of bits used to address bytes in a
single page in the EEPROM device. A 64 byte page, for example

6
common/cmd_eeprom.c
View File

@ -161,6 +161,9 @@ int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt
#if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
spi_read (addr, alen, buffer, len);
#else
#if defined(CONFIG_SYS_I2C_EEPROM_BUS)
i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
#endif
if (i2c_read(addr[0], offset, alen - 1, buffer, len))
rcode = 1;
#endif
@ -338,6 +341,9 @@ int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cn
}
/* Write is enabled ... now write eeprom value.
*/
#endif
#if defined(CONFIG_SYS_I2C_EEPROM_BUS)
i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
#endif
if (i2c_write(addr[0], offset, alen - 1, buffer, len))
rcode = 1;