If your driver isn't loading, check dmesg | grep qcom . Often, a driver fails because a dependency (like a specific clock or regulator) wasn't initialized first. Conclusion
One of the biggest hurdles in MSM8953 driver development is the gap between "Downstream" and "Mainline."
The MSM8953 uses the pinctrl-msm driver. If you are developing a driver for a new sensor or button, you must define the pin configuration (bias, drive strength, and function) in the pinctrl section of your ARM64 device tree. 2. Power Management (RPM)
If you are looking to understand or implement , this guide covers the architectural essentials, the role of the Device Tree, and the current state of mainline Linux support. Understanding the MSM8953 Architecture