linux-kernel - Re: [PATCH 00/14] POWER: BQ27x00: New Properties, fixes, bq27000 support

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Message-ID: <4D516BBB.5090506@metafoo.de>
Date:	Tue, 08 Feb 2011 17:13:47 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Grazvydas Ignotas <notasas@...il.com>
CC:	Anton Vorontsov <cbouatmailru@...il.com>,
	Rodolfo Giometti <giometti@...ux.it>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/14] POWER: BQ27x00: New Properties, fixes, bq27000
 support

On 02/08/2011 12:40 PM, Grazvydas Ignotas wrote:
> That works. However I wonder about the delay, I've experimentally
> determined that bq27500 refreshes in about a second, so before this
> series I could for example run 'watch -n 1 cat current_now' and see
> current changes almost in realtime (when toggling backlight, for
> example). Maybe we could have different cache timeout for different
> chips or have quickly changing properties (like current and voltage)
> bypass the cache.

Looking at the datasheet confirms that the bq27500 updates the current register
every second. The bq27000 updates it only every 5.12 seconds.
I think reducing the the cache time for bq27500 to 1 second would render the
cache mostly useless, but maybe it makes sense to bypass the cache for voltage
and current on the bq27500.

- Lars

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