cpufreq: rockchip: handle -EPROBE_DEFER for late PMIC initialization #432
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On boards like Youyeetoo YY3588 where the RK806 PMIC initializes late, the cpufreq driver would fail to get the CPU regulator and abort probe. This caused CPU frequency scaling to be unavailable. Handle -EPROBE_DEFER from regulator_get_optional() to allow the driver to retry when the PMIC becomes available.
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Summary
Fix CPU frequency scaling failing on boards where the PMIC initializes late.
On boards like Youyeetoo YY3588 where the RK806 PMIC is on SPI bus and initializes after the cpufreq driver probes, regulator_get_optional() returns -EPROBE_DEFER. The driver was not handling this case, causing cpufreq to fail permanently.
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