Hello,
in my device-tree (for stm32f429 - as found in the linux kernel) exist
two branches /soc and /clocks. While /soc contains all embedded
functionality of the SOC, /clocks contain the external crystal, like in
the following snippet.
/ {
clocks {
clk_hse: clk-hse {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <0>;
};
};
soc {
rcc: rcc@40023810 {
#clock-cells = <2>;
compatible = "st,stm32f42xx-rcc", "st,stm32-rcc";
reg = <0x40023800 0x400>;
clocks = <&clk_hse>;
};
...
};
};
While /soc is detected in u-boot using the simple-bus class, /clocks is
ignored completely, Because of that, the crystal isn't detected, too.
If I move the crystal into the /soc branch, it is found and can be
referenced.
Poking through the code I haven't yet found the reason, why soc is
initialized as simple-bus and clocks is not. Could someone please
enlighten me?
best regards
Benjamin Tietz
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