feat: Add Intel Cherry Trail (x5-Z8350) GPIO/Pinctrl kernel support for eMMC

[P47Phoenix]

Feature Request

Summary

Please enable Intel Cherry Trail GPIO/Pinctrl kernel modules to support eMMC storage on Intel Atom x5-Z8350 and similar Cherry Trail platforms.

Background

The existing gpio-pinctrl extension (added in v1.13.0-alpha.0) provides Apollo Lake support via pinctrl-broxton, but Cherry Trail devices require different drivers.

Hardware Details

• CPU: Intel Atom x5-Z8350 (Cherry Trail)
• eMMC Controller: Intel Cherry Trail SDHCI (PCI ID: 8086:2295)
• ACPI Device: INT33FF (Cherry Trail GPIO)

Required Kernel Config Changes

CONFIG_X86_INTEL_LPSS=y
CONFIG_PINCTRL_CHERRYVIEW=m

Required Modules

Module	Purpose
pinctrl_cherryview	Cherry Trail pinctrl driver
intel_lpss	Intel Low Power Subsystem
intel_lpss_pci	LPSS PCI driver
pwm_lpss	LPSS PWM driver
pwm_lpss_pci	LPSS PWM PCI driver

Current Behavior

The eMMC controller is detected but fails to initialize:

sdhci-pci 0000:00:11.0: SDHCI controller found [8086:2295]
mmc0: Failed to initialize a non-removable card

The required modules are not compiled in the kernel:

error loading module "pinctrl_cherryview": module not found
error loading module "intel_lpss": module not found

Expected Behavior

With the Cherry Trail modules enabled, the eMMC should be detected as /dev/mmcblk0 and be usable as an install target.

Use Case

Many low-cost mini PCs, industrial devices, and embedded systems use Intel Cherry Trail SoCs with internal eMMC storage. Adding this support would allow Talos to run on these devices.

Related

• Commit c41127b added Apollo Lake GPIO/Pinctrl support
• Extension gpio-pinctrl provides pinctrl-broxton but not pinctrl-cherryview

Thank you!