[U-Boot] question about software i2c multi instance

[Heiko Schocher <hs@denx.de>]

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
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