Re: [PATCH] rtc: pcf8563: disable CLKOUT

From: Heiko Schocher
Date: Wed Oct 14 2015 - 00:19:39 EST


Hello Alexandre,

Am 13.10.2015 um 22:17 schrieb Alexandre Belloni:
Hi,

On 13/10/2015 at 07:08:58 +0200, Heiko Schocher wrote :
Disable the CLKOUT of the RTC after power-up.
After power-up/reset of the RTC, CLKOUT is enabled by default,
with CLKOUT enabled the RTC chip has 2-3 times higher power
consumption. If you do not need CLKOUT, you can disable the
CLKOUT with setting "disable-clkout" property.


I think you can simply unconditionally disable clkout. My preferred way
of doing what you suggest is probably to register a clock in the CCF. If
the clock is not used, it will be automatically disabled.
It will also provide a generic way of setting the clkout frequency (some
RTC are able to output 32kHZ, 1kHz and 1Hz).

Does disabling it ot break some boards?

I take a look into CCF, good idea.

bye,
Heiko
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/