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I2C bus 2 for gpio missing
posted in IGEPv2
0
Hi
I have an accelerometer which I wired into gpio pins 23, 24 of the igepv2.
I have 2 IGEPv2 boards for testing
Board #1 = the default configuration supplied by ISEE. It works fine with the accelerometer. i2cdetect -l command shows 3 i2c busses.
i2c-1
i2c-2 ==> this is where the accelerometer shows up if it is wired in
i2c-3
Board #2 = my configuration (search Kernel 3.9.11 and directFB in this post for details). The accelerometer does not work here.
i2cdetect -l shows only 2 i2c busses.
i2c-1
i2c-3
Where is i2c-2?
My xconfig for Linux has 4 i2c-related options selected
x enable compatibility for old user space
x I2C device interface
x autoselect pertinent helper modules
m GPIO based bitbanging I2C
I have an accelerometer which I wired into gpio pins 23, 24 of the igepv2.
I have 2 IGEPv2 boards for testing
Board #1 = the default configuration supplied by ISEE. It works fine with the accelerometer. i2cdetect -l command shows 3 i2c busses.
i2c-1
i2c-2 ==> this is where the accelerometer shows up if it is wired in
i2c-3
Board #2 = my configuration (search Kernel 3.9.11 and directFB in this post for details). The accelerometer does not work here.
i2cdetect -l shows only 2 i2c busses.
i2c-1
i2c-3
Where is i2c-2?
My xconfig for Linux has 4 i2c-related options selected
x enable compatibility for old user space
x I2C device interface
x autoselect pertinent helper modules
m GPIO based bitbanging I2C
Responses (3)
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Accepted Answer
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Accepted Answer
0Hi eballetbo
Thanks for responding. As suggested, I updated the kernel file arch/arm/mach-omap2/board-igep0020.c
with
omap_register_i2c_bus(2, 100, NULL);
placing it right after the lines
omap_register_i2c_bus(3, 100, igep2_i2c3_boardinfo,
ARRAY_SIZE(igep2_i2c3_boardinfo));
I reran make and got the following message...
arch/arm/mach-omap2/board-igep0020.c: In function 'igep0020_init':
arch/arm/mach-omap2/board-igep0020.c:447: error: too few arguments to function 'omap_register_i2c_bus'
I tried
omap_register_i2c_bus(2, 100, NULL, NULL);
and got warning
CC arch/arm/mach-omap2/board-igep0020.o
arch/arm/mach-omap2/board-igep0020.c: In function 'igep0020_init':
arch/arm/mach-omap2/board-igep0020.c:447: warning: passing argument 4 of 'omap_register_i2c_bus' makes integer from pointer without a cast
arch/arm/plat-omap/include/plat/i2c.h:27: note: expected 'unsigned int' but argument is of type 'void *'
Lots of warnings but it works!!!!!!
Thanks so much eballetbo
Peter -
Accepted Answer
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