Hello Lukasz, Lukasz Majewski wrote: > On Wed, 06 Jul 2011 07:56:20 +0200 > Heiko Schocher <h...@denx.de> wrote: > >> Hello Mike, >> >> Mike Frysinger wrote: >>> On Tuesday, July 05, 2011 08:23:41 Lukasz Majewski wrote: >>>> This commit adds I2C software support for Samsung's S5PC110 >>>> family of processors. >>>> The generic drivers/i2c/soft_i2c framework is used, with >>>> routines provided by this commit. >>> if you simply implemented the generic gpio layer (asm/gpio.h), the >>> soft_i2c.c code already handles gluing to GPIO pins. then you >>> wouldnt need a sep driver at all. you can see the bf561-ezkit >>> already using this code. -mike >> Yes, that was my thought too. No seperate i2c driver should be needed >> here. >> >> bye, >> Heiko > > Thanks Mike and Heiko for reply. > > However I've got some extra question. > > In the bf651-ezkit.h file I can see the I2C definition: > > #define CONFIG_SOFT_I2C > #define CONFIG_SOFT_I2C_GPIO_SCL GPIO_PF0 > #define CONFIG_SOFT_I2C_GPIO_SDA GPIO_PF1 > > My concern is about the situation when SoC needs more than one Software > I2C run via GPIO? > > Please consider following scenario: > One sensor is connected to pins 1(SCL) and 3(SDA) and another to 4(SCL) > and 5(SDA) in a GPIO port. > > As fair as I've understood the software_i2c framework, it is supposed to > run only one instance of GPIO I2C. > > Is there any way to "instantiate" more than one I2C GPIO interface via > software_i2c?
It should be possible (not tested), but not very nice: First, you have to define CONFIG_I2C_MULTI_BUS and CONFIG_SYS_MAX_I2C_BUS Then your CONFIG_SOFT_I2C_GPIO_SDA and CONFIG_SOFT_I2C_GPIO_SCL should look something like this: #define CONFIG_SOFT_I2C_GPIO_SDA get_sda_pin with int get_sda_pin(void) { int busnr = i2c_get_bus_num(); switch (busnr) { case 0: return 3; break; case 1: return 5; break; [...] } } Cleaner would be to get the i2c multibus branch to mainline, see: http://git.denx.de/?p=u-boot/u-boot-i2c.git;a=shortlog;h=refs/heads/multibus_v2 bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot