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i2c: Set default I2C bus number

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This patch allows using i2c commands (e.g. "i2c probe", "i2c md", etc)
without the need to first select the bus number with e.g. "i2c dev 0".

This is the "i2c" command behavior similar to the one from pre DM, where
by default bus 0 was immediately accessible.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Lukasz Majewski 2017-03-21 12:08:25 +01:00 committed by Heiko Schocher
parent b52a3fa08b
commit e46f8a3309
2 changed files with 24 additions and 0 deletions
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10
cmd/i2c.c
View file

@ -151,6 +151,16 @@ static int cmd_i2c_set_bus_num(unsigned int busnum)
static int i2c_get_cur_bus(struct udevice **busp)
{
#ifdef CONFIG_I2C_SET_DEFAULT_BUS_NUM
if (!i2c_cur_bus) {
if (cmd_i2c_set_bus_num(CONFIG_I2C_DEFAULT_BUS_NUMBER)) {
printf("Default I2C bus %d not found\n",
CONFIG_I2C_DEFAULT_BUS_NUMBER);
return -ENODEV;
}
}
#endif
if (!i2c_cur_bus) {
puts("No I2C bus selected\n");
return -ENODEV;

14
drivers/i2c/Kconfig
View file

@ -49,6 +49,20 @@ config I2C_CROS_EC_LDO
avoid duplicating the logic in the TPS65090 regulator driver for
enabling/disabling an LDO.
config I2C_SET_DEFAULT_BUS_NUM
bool "Set default I2C bus number"
depends on DM_I2C
help
Set default number of I2C bus to be accessed. This option provides
behaviour similar to old (i.e. pre DM) I2C bus driver.
config I2C_DEFAULT_BUS_NUMBER
hex "I2C default bus number"
depends on I2C_SET_DEFAULT_BUS_NUM
default 0x0
help
Number of default I2C bus to use
config DM_I2C_GPIO
bool "Enable Driver Model for software emulated I2C bus driver"
depends on DM_I2C && DM_GPIO