DT/OF On-Demand Device Probing Appears Ready, Likely For Linux 4.4
For the past several months Tomeu Vizoso at Collabora has been working toward on-demand device probing for speeding up the boot process of ARM devices like the NVIDIA Tegra Chromebook.
Tomeu explained the work with an earlier patch series, "I have a problem with the panel on my Tegra Chromebook taking longer than expected to be ready during boot (Stéphane Marchesin reported what is basically the same issue), and have looked into ordered probing as a better way of solving this than moving nodes around in the DT or playing with initcall levels and linking order."
He implemented on-demand device probing for OF/DT and will do probing on demand for GPIO, Pinctrl, Regulator, DRM, i2c, PWM, Backlight, USB PHY, CLK, DMA, Power-Supply, and core drivers. He explains in the patches from the aforelinked Git link, "The goal is to reduce deferred probes to a minimum, as it makes it very cumbersome to find out why a device failed to probe, and can introduce very big delays in when a critical device is probed."
It appears that this on-demand device probing is ready as a pull request has been sent in that would queue it up for integration during the Linux 4.4 merge window.
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