Add a simple-pm-bus driver to get AM335x to boot.
If the DTS node contains a clock it will be enabled later in the boot process.
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Any reason the clock are enabled after interrupts ? I suspect that some stuff will rely on the clock being activated at attach.
The bindings have this comment :
Hence, the bus controller's PM domain and/or clock must be enabled for child devices connected to the bus (either on-SoC or externally) to function.
It also seems that some TI nodes doesn't respect the bindings as they have no clocks or power-domain property, are we relying on u-boot for those to work ?
| sys/dev/fdt/simplepmbus.c | ||
|---|---|---|
| 105 | Doesn't seems to be true, I think we can have multiple clocks. | |
| sys/dev/fdt/simplepmbus.c | ||
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| 113 | I've missed that the first time, any reason we don't enable the clock directly ? | |
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So, apparently the goal of simple-pm-bus is only to enable runtime pm in the Linux kernel for the whole child tree, while simple-bus doesn't do that.
Apparently the bindings are wrong suggesting that either power-domain or clock is required and the Linux code seems to indicate this ...