Messages in this thread | | | Date | Fri, 27 Jan 2023 14:13:21 +0000 | Subject | Re: [PATCH 16/24] rtc: pm8xxx: add support for nvmem offset | From | Srinivas Kandagatla <> |
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On 26/01/2023 14:20, 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 the > driver can take into account. > > Add support for storing a 32-bit offset from the Epoch in an nvmem cell > so that the RTC time can be set on such platforms. > > Signed-off-by: Johan Hovold <johan+linaro@kernel.org> > --- > drivers/rtc/rtc-pm8xxx.c | 134 +++++++++++++++++++++++++++++++++++---- > 1 file changed, 123 insertions(+), 11 deletions(-) > > diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c > index 922aef0f0241..09816b9f6282 100644 > --- a/drivers/rtc/rtc-pm8xxx.c > +++ b/drivers/rtc/rtc-pm8xxx.c > @@ -3,6 +3,7 @@ > */ > +static int pm8xxx_rtc_read_nvmem_offset(struct pm8xxx_rtc *rtc_dd) > +{ > + size_t len; > + void *buf; > + int rc; > + > + buf = nvmem_cell_read(rtc_dd->nvmem_cell, &len); > + if (IS_ERR(buf)) { > + rc = PTR_ERR(buf); > + dev_err(rtc_dd->dev, "failed to read nvmem offset: %d\n", rc); > + return rc; > + } > + > + if (len != sizeof(u32)) { > + dev_err(rtc_dd->dev, "unexpected nvmem cell size %zu\n", len); > + kfree(buf); > + return -EINVAL; > + } how about us nvmem_cell_read_u32()
> + > + rtc_dd->offset = get_unaligned_le32(buf); > + > + kfree(buf); > + > + return 0; > +} > +
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