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@xxxxxxxxxxxxxxx] > Sent: Wednesday, May 17, 2017 7:56 PM > To: 劉嘉駿; linux-i2c@xxxxxxxxxxxxxxx; linux-acpi@xxxxxxxxxxxxxxx; > linux-input@xxxxxxxxxxxxxxx > Cc: Dmitry Torokhov; benjamin.tissoires@xxxxxxxxx; > jeff.chuang@xxxxxxxxxx > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
