Linux/dra77p: i2c device error

Xiongwei Huang60

Prodigy 220 points

Part Number: DRA77P
Other Parts Discussed in Thread: DRA76P

Tool/software: Linux

Hi all

1) I read chipid with

# omapconf read 0x4AE0C20C

69C70304

and this is dra77p , right ?

2) does this compatible with dra74x pin ball ?

3) does this chip i2c5 driver support with external 3.3v pull up ? or just only support 1.8v ?

I read i2c pad config with

# omapconf read 0x4a0036b4

0005000A

# omapconf read 0x4a0036b8

0005000A

while on our custom board , I get no device found when I use i2c tools scan

# i2cdetect -y 4 -r

0 1 2 3 4 5 6 7 8 9 a b c d e f

00: -- -- -- -- -- -- -- -- -- -- -- -- --

10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

70: -- -- -- -- -- -- -- --

regards

Xiongwei

over 6 years ago

0 Stanislav Stilyanov over 6 years ago

TI__Genius 15120 points

Xiongwei,

1) Yes, this is a pre-production test device for DRA77 series
2) No
3) Yes if you power the vddshv10 rail with 3.3Volts. This rail however powers other peripherals too. You must check if it is ok for the other peripherals. Other solution would be to insert a level translator.
Regards,
Stan

0 Xiongwei Huang60 over 6 years ago in reply to Stanislav Stilyanov

Prodigy 220 points

Hello Stanislav
So , does this chip compatible with DRA777P on all 5 I2C controllers ?

0 Stanislav Stilyanov over 6 years ago in reply to Xiongwei Huang60

TI__Genius 15120 points

Hi,

Yes I2c modules are the same. The pre-production device however may not meet all timing parameters defined in the datasheet.

Regards,

Stan

0 Xiongwei Huang60 over 6 years ago in reply to Stanislav Stilyanov

Prodigy 220 points

Hello stan
[ 3143.054021] i2c i2c-4: ioctl, cmd=0x705, arg=0xbe9ccc5c
[ 3143.054037] i2c i2c-4: ioctl, cmd=0x706, arg=0x0c
[ 3143.054048] i2c i2c-4: ioctl, cmd=0x720, arg=0xbe9ccc24
[ 3143.054060] i2c i2c-4: master_xfer[0] W, addr=0x0c, len=1
[ 3143.054070] i2c i2c-4: master_xfer[1] R, addr=0x0c, len=1
[ 3143.067724] omap_i2c 4807c000.i2c: addr: 0x000c, len: 1, flags: 0x0, stop: 0
[ 3143.067758] omap_i2c 4807c000.i2c: IRQ (ISR = 0x0010)
[ 3143.067855] omap_i2c 4807c000.i2c: IRQ (ISR = 0x0006)

I just get an error of no deivce ACK (BIT 9) , and can you give some advices from SOC side ?

I copy the u-boot code from
git://git.omapzoom.org/repo/u-boot.git branch of p-ti-u-boot-2016.05
and kernel code from
git://git.omapzoom.org/kernel/omap.git branch of p-ti-lsk-linux-4.4.y

regards

0 Peter Li79 over 6 years ago in reply to Xiongwei Huang60

TI__Expert 8940 points

Hi, Xiongwei:

we need to check the I2C bus activity.

we need to figure out whether it is the I2C slave device which doesn't acknowledge the I2C addressing.

0 Xiongwei Huang60 over 6 years ago in reply to Peter Li79

Prodigy 220 points

Hi
We have reworked i2c device to i2c2 ,and works on i2c bus#2
just dont work on i2c bus #5

so I just wonder , what should I config with this special one ,and I check the dra76p evm board scheme ,we have the same 921 serlizer chip ,and same pin of MCASP1_AXR0/1 and sam config with pad config from

git.omapzoom.org/

Regards

0 Xiongwei Huang60 over 6 years ago in reply to Xiongwei Huang60

Prodigy 220 points

Hi all

please ignore this thread , our hardware bug

Thanks for your help

Regards

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Linux/dra77p: i2c device error