TPS65070X Touchscreen

Hi,I use TPS65070X as Touchscreen Interface,which use Kernel support driver drivers/input/touchscreen/tps6507x-ts.c and drivers/mfd/tps6507x.c ,
when i use AC adapter to povide power to my board,tps65070 touchscreen driver register succefully,but when i use Battery to pvovide,it faild,

tps6507x-ts: probe of tps6507x-ts failed with error -5
s3c-i2c s3c-i2c.0: i2c-0: S3C I2C adapter

my hw staff check tps65070 PMIC power,it is right,so whats the issue? or can give me some advice to ensure hw is OK ?

When use AC adapter to provide Power to board,tps65070 touchscreen driver work find roughly,but some time,my arm11 i2C driver also say -110 error in stop condition.

Liang Sun：

Hi Tommy,

Please have a try to  force VREF on by setting bit 4 of ADCONFIG to 1 when using the touchscreen and powering with BAT only on the TPS6507x.

Here is aprevious case: e2e.ti.com/…/106727.aspx

tommy：

回复 Liang Sun:

Thanks,but i also have another issue,

when use battery to provide  power to board,I2C can not find PMIC succesfully,I2C -110 timeout error,when use DC ,it can.

Liang Sun：

回复 tommy:

Tommy,

Did the battery use the same input as DC power in the board?

If no, try to use the same input; If yes, detect the waveform for the power supply of the board to check whether they are different.