On Thu, Jan 26, 2023 at 03:20:51PM +0100, Johan Hovold wrote: > On many Qualcomm platforms the PMIC RTC control and time registers are > read-only so that the RTC time can not be updated. Instead an offset > needs be stored in some machine-specific non-volatile memory, which a > driver can take into account. > > Add a 'qcom,uefi-rtc-info' boolean flag which indicates that the RTC > offset is stored in a Qualcomm specific UEFI variable so that the RTC > time can be updated on such platforms. > > The UEFI variable is > > 882f8c2b-9646-435f-8de5-f208ff80c1bd-RTCInfo > > and holds a 12-byte structure where the first four bytes is a GPS time > offset in little-endian byte order. Can't you just try to read the UEFI variable and use it if that succeeds? I don't like this in DT because what if lots of devices start storing lots of things in vendor specific UEFI variables. It doesn't scale. Rob
