First I thank you all for reply. I tried to recompile the kernel but I found out that this config has already been enabled. Then I found that this problem is caused by the kernel is lack of AXP288 PMIC driver, not the kernel itself.(ref: https://bugzilla.kernel.org/show_bug.cgi?id=88471 ) Thank you again for patience.
First I thank you all for reply. I tried to recompile the kernel but I found out that this config has already been enabled. Then I found that this problem is caused by the kernel is lack of AXP288 PMIC driver, not the kernel itself.(ref: https:/ /bugzilla. kernel. org/show_ bug.cgi? id=88471 ) Thank you again for patience.