RE: How my i2c device bring up?

[劉嘉駿 <scott.liu@emc.com.tw>]

Hi Jakko,
	I am not happy because the internet & network are so slow..... :(
	The kernel of those configurations are still on compile. 

	I have checked that my target platform is Intel Baytrail, so good
luck with me.
	Thank you !

BR,
Scott 


> -----Original Message-----
> From: Jarkko Nikula [mailto:jarkko.nikula@linux.intel.com]
> Sent: Wednesday, May 17, 2017 7:56 PM
> To: 劉嘉駿; linux-i2c@vger.kernel.org; linux-acpi@vger.kernel.org;
> linux-input@vger.kernel.org
> Cc: Dmitry Torokhov; benjamin.tissoires@gmail.com;
> jeff.chuang@emc.com.tw
> Subject: Re: How my i2c device bring up?
> 
> Hi
> 
> On 05/17/2017 11:41 AM, 劉嘉駿 wrote:
> >
> > I have tried to install three versions of Chromium OS(R58-9334,
> > R59-9351,
> > R60-9554) respectively,
> > all of them runs kernel v4.4 and all of them can see nothing for my
> > device by “ls /sys/bus/i2c/devices”.
> > The output file is as “Chromum_v4.4.52_dev_bus_i2c_devices_0517.jpg”.
> > I guess the underlying drivers(I2C bus, ACPI DSDT table) could be
> > failed to recognize my I2C device.
> >
> Is this Intel Skylake ix-6xxx based laptop?
> 
> My guess is that based on your finding that i2c touchscreen works in
Ubuntu
> that Chromium kernel may not have needed drivers enabled.
> 
> If you have access to kernel config of Chromium image could you check does
it
> have these MFD_INTEL_LPSS configurations on? I have them as built-in but
> should work when built as modules too.
> 
> CONFIG_MFD_INTEL_LPSS=y
> CONFIG_MFD_INTEL_LPSS_ACPI=y
> CONFIG_MFD_INTEL_LPSS_PCI=y
> 
> I suppose these I2C_DESIGNWARE options are already on since I know there
> are Intel Baytrail based Chromebooks out there.
> 
> CONFIG_I2C_DESIGNWARE_CORE=m
> CONFIG_I2C_DESIGNWARE_PLATFORM=m
> CONFIG_I2C_DESIGNWARE_PCI=m
> CONFIG_I2C_DESIGNWARE_BAYTRAIL=y
> 
> --
> Jarkko