Re: [PATCH] rtc: add BSM flags descriptions

[Hugo Villeneuve]

On Tue, 13 Jan 2026 10:04:27 -0500
Hugo Villeneuve <hugo@xxxxxxxxxxx> wrote:

> On Mon, 21 Jul 2025 11:33:31 -0400
> Hugo Villeneuve <hugo@xxxxxxxxxxx> wrote:
> 
> > From: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
> > 
> > It is hard to decipher what the RTC BSM flags mean, so add
> > meaningful descriptions.
> > 
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
> > ---
> >  include/uapi/linux/rtc.h | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> > 
> > diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h
> > index 97aca4503a6a..da65130e316d 100644
> > --- a/include/uapi/linux/rtc.h
> > +++ b/include/uapi/linux/rtc.h
> > @@ -141,10 +141,15 @@ struct rtc_param {
> >  #define RTC_PARAM_CORRECTION		1
> >  #define RTC_PARAM_BACKUP_SWITCH_MODE	2
> >  
> > +/* Backup switch mode */
> >  #define RTC_BSM_DISABLED	0
> > -#define RTC_BSM_DIRECT		1
> > -#define RTC_BSM_LEVEL		2
> > -#define RTC_BSM_STANDBY		3
> > +#define RTC_BSM_DIRECT		1 /* Switch if Vbackup > Vdd */
> > +#define RTC_BSM_LEVEL		2 /* Switch based on a threshold, usually with an hysteresis */
> > +#define RTC_BSM_STANDBY		3 /*
> > +				   * Switch if Vdd > Vbackup.
> > +				   * Useful to ensure the RTC doesn't draw any
> > +				   * power until the device is first powered on.
> > +				   */
> >  
> >  #define RTC_MAX_FREQ	8192
> 
> Ping?

Ping, Ping?


-- 
Hugo Villeneuve