Hello Bo,
Am 20.03.2015 10:44, schrieb Bo Shen:
Hi Heiko, After check the software i2c code, I found it can not support multi instances, although it has I2C_SOFT_DECLARATIONS2, I2C_SOFT_DECLARATIONS3, I2C_SOFT_DECLARATIONS4. Because, when do GPIO operation, there is only one pair of CONFIG_SOFT_I2C_GPIO_SCL and CONFIG_SOFT_I2C_GPIO_SDA. So, if want to support multi instances, it needs to extend the GPIO configuration for SCL/SDA, am I right?
Prefered way should be to use DM, Przemyslaw posted patches for the soft-i2c driver, see http://lists.denx.de/pipermail/u-boot/2015-March/207641.html
maybe you can try this?
If not, you are right, you must define your own I2C_SCL/I2C_SDA/I2C_READ/I2C_INIT defines, for example:
# define I2C_SCL(bit) \ do { \ switch(I2C_ADAP_HWNR) { case 0: gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL_0, bit); \ break; case 1: gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL_1, bit); \ break; [...] I2C_GPIO_SYNC; \ } while (0)
bye, Heiko