[meta-intel] GPIO functionality for Intel E3845 CPU (valley-island, bay-trail)
Tan, Jui Nee
jui.nee.tan at intel.com
Thu Oct 18 02:40:32 PDT 2018
Could you please try to dump ACPI DSDT table and check if the following strings exist:
- INT33B2
- INT33FC
These are the ACPI ID required to load BYT pinctrl driver.
Thanks,
Juinee
From: Henrik Haugaard Jensen [mailto:hhj at trackman.com]
Sent: Wednesday, October 17, 2018 7:04 PM
To: Tan, Jui Nee <jui.nee.tan at intel.com>; meta-intel at yoctoproject.org
Subject: RE: [meta-intel] GPIO functionality for Intel E3845 CPU (valley-island, bay-trail)
Thanks,
I tried the PINCTRL configs, but /sys/class/gpio/ and /sys/kernel/debug/gpio does still not get populated.
A bit of printk debugging show that ”byt_gpio_init” is called but “byt_pinctrl_probe” is not.
Any ideas?
Regards,
Henrik
From: Tan, Jui Nee <jui.nee.tan at intel.com<mailto:jui.nee.tan at intel.com>>
Sent: Wednesday, 17 October 2018 03.11
To: Henrik Haugaard Jensen <hhj at trackman.com<mailto:hhj at trackman.com>>; meta-intel at yoctoproject.org<mailto:meta-intel at yoctoproject.org>
Subject: RE: [meta-intel] GPIO functionality for Intel E3845 CPU (valley-island, bay-trail)
You should be able to see the gpiochips available in /sys/class/gpio/gpiochip* and “byt_gpio_init” is also being called with the following kernel configurations enabled:
CONFIG_PINCTRL=y
CONFIG_PINCTRL_BAYTRAIL=y
CONFIG_PINCTRL_INTEL=y
Thanks,
Juinee
From: meta-intel-bounces at yoctoproject.org<mailto:meta-intel-bounces at yoctoproject.org> [mailto:meta-intel-bounces at yoctoproject.org] On Behalf Of Henrik Haugaard Jensen
Sent: Wednesday, October 10, 2018 10:28 PM
To: meta-intel at yoctoproject.org<mailto:meta-intel at yoctoproject.org>
Subject: [meta-intel] GPIO functionality for Intel E3845 CPU (valley-island, bay-trail)
We have successfully used meta-intel jethro branch for our device based on an intel E3845 CPU.
Now we need to upgrade to a newer Linux kernel to get full camera/video/media support. But when building new BSP with sumo or rocko branches it turn out that pinctrl/GPIO system is not working neither with linux-intel 4.9 or 4.14.
Baytrail pin-controller support and GPIO support seems to be configured for the kernel out of the box, but after booting “/sys/kernel/debug/gpio” is empty and the pin-controller gpio-chip’s is not showing in “/sys/class/gpio”.
Doing initcall debugging shows that “bxt_pinctrl_init” (Broxton ) is called and not “byt_gpio_init” (Baytrail) - I have tried, but not been able, to find out why.
I have tried both vanilla meta-intel sumo BSP and “ROCKO 2.4 – BAY TRAIL BSP” (meta-intel branch 8.1-rocko-2.4.2) – what is going wrong?
Also I have the impression that since linux 4.8 the “/sys/class/gpio” user interface is obsolete and apparently replaced by /dev/gpioxxx pin devices and a new gpiolib userspace tool for this has been provided. Has this new GPIO interface made its way into meta-intel?
Regards,
Henrik Haugaard Jensen
TrackMan
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