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FS#4192 - sunxi-h5 kernel defconfigs missing CONFIG_RTC_DRV_SUN6I=y for i2c to work #9172

openwrt-bot opened this issue Dec 19, 2021 · 1 comment


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@openwrt-bot openwrt-bot commented Dec 19, 2021


The dtb that ships with openwrt contains for orangepi-pc2 contains the rtc device, i2c devices like the sy8106a voltage regulator, but they cannot be used in the kernel because this CONFIG_RTC_DRV_SUN6I=n so the i2c clock cannot be initialized.
I assume this is an oversight because it was not known that the RTC driver is required for i2c to work ? If i2c was not supposed to work, then drivers for sy8106a and also CPU_FREQ should also be =n to not waste space as they cannot be used.
Setting CONFIG_RTC_DRV_SUN6I=y in kernel_menuconfig allows i2c to be used, so cat /sys/kernel/debug/regulator/regulator_summary shows all the voltage regulators in the dtb, and with a small dtb patch (just adding the operational settings include to all h5 device dtbs that use sy8016a, like here, full DVFS can be enabled via cpufreq governors (which are already baked in) and it works perfectly.

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@jow- jow- commented Feb 18, 2022

Duplicate of #9170

@jow- jow- closed this Feb 18, 2022
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