On Tue, 05 Jul 2016 16:47:38 +0800 Icenowy Zheng wrote: > I read the datasheet of axp20x, and then found that this driver does > not support backup RTC battery. > (But maybe backup battery do not need a driver -- at least on IBM PC > it has no driver) A driver is needed to enable/disable the RTC battery charging (unless uboot does it). However all the driver can do according to datasheet is configure the charge voltage/current or disable charging completely. Monitoring RTC battery is not possible, neither is presence detection. So driver should just apply configuration it finds in device-tree and eventually share that information via power supply class. > And I don't know whether the axp20x has default Li-ion/LiPo battery > OCV parameter. (axp22x seems to be have a set of default OCV) It seems to have default OCV parameters as well. With empty RTC battery OCV values are present. > You can test this driver on AXP20x. (I think I didn't access to > AXP22x-specified registers in the power supply code) Bruno -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
