Re: [Gumstix-users] Real Time Clock

[Akram H. <ak...@aq...>]

Since the possible values for the charging rate is basically a simple ENUM,
I think Paul's suggestion is a good one (kconfig item)


On Fri, Aug 9, 2013 at 5:09 AM, Ash Charles <ash...@gm...> wrote:

> Hi Paul,
>
> The trickle charging is enabled by CONFIG_RTC_DRV_TWL4030.  In the
> Linux source code, the driver can be found in
> <linux>/drivers/rtc/rtc-twl.c
> (https://github.com/gumstix/linux/blob/omap-3.2/drivers/rtc/rtc-twl.c)
>
> In the probe function, you can see some code along the lines of
>         /* enable backup battery charging */
>         /* use a conservative 25uA @ 3.1V */
>         ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
>                 BIT_PM_RECEIVER_BB_CFG_BBCHEN |
>                 BIT_PM_RECEIVER_BB_CFG_BBSEL_3V1 |
>                 BIT_PM_RECEIVER_BB_CFG_BBISEL_25UA,
>                 REG_BB_CFG);
>
> --Ash
>
> On Thu, Aug 8, 2013 at 9:39 AM, Paul D. DeRocco <pde...@ix...>
> wrote:
> >> From: Ash Charles [mailto:ash...@gm...]
> >>
> >> For what it's worth, I could bump up the default charge rate for the
> >> Gumstix kernels.  Does this cause problems or help anyone out?  IIRC,
> >> it is set low just to be safe.
> >
> > Isn't there some way to make this configurable through menuconfig, or by
> > supplying a configuration fragment? (A proc file interface would be even
> > better, but it's probably not worth going to that much trouble.)
> >
> > Meanwhile, what kernel source file contains this stuff, so I can hack
> mine
> > today?
> >
> > --
> >
> > Ciao,               Paul D. DeRocco
> > Paul                mailto:pde...@ix...
> >
> >
> >
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