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From: Lars-Peter Clausen <lars@metafoo.de>
To: Grazvydas Ignotas <notasas@gmail.com>
Cc: Anton Vorontsov <cbouatmailru@gmail.com>,
	Rodolfo Giometti <giometti@linux.it>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/14] POWER: BQ27x00: New Properties, fixes, bq27000 support
Date: Tue, 08 Feb 2011 17:13:47 +0100	[thread overview]
Message-ID: <4D516BBB.5090506@metafoo.de> (raw)
In-Reply-To: <AANLkTimgejf7D9LWyxa=W7Hc4MTWEotMnr7h2SC9iPCQ@mail.gmail.com>

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


  reply	other threads:[~2011-02-08 16:12 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-06  0:47 Lars-Peter Clausen
2011-02-06  0:47 ` [PATCH 01/14] POWER: bq27x00: Add type property Lars-Peter Clausen
2011-02-06 16:43   ` Rodolfo Giometti
2011-02-06  0:47 ` [PATCH 02/14] POWER: bq27x00: Improve temperature precession Lars-Peter Clausen
2011-02-07  8:06   ` Rodolfo Giometti
2011-02-06  0:48 ` [PATCH 03/14] POWER: bq27x00: Fix current now property Lars-Peter Clausen
2011-02-07  8:07   ` Rodolfo Giometti
2011-02-06  0:48 ` [PATCH 04/14] POWER: bq27x00: Return -ENODEV for properties if the battery is not present Lars-Peter Clausen
2011-02-06 16:40   ` Rodolfo Giometti
2011-02-06  0:48 ` [PATCH 05/14] POWER: bq27x00: Prepare code for addition of bq27000 platform driver Lars-Peter Clausen
2011-02-07  8:09   ` Rodolfo Giometti
2011-02-06  0:48 ` [PATCH 06/14] POWER: bq27x00: Add bq27000 support Lars-Peter Clausen
2011-02-06  0:48 ` [PATCH 07/14] POWER: bq27X00: Cache battery registers Lars-Peter Clausen
2011-02-06  0:48 ` [PATCH 08/14] POWER: bq27x00: Poll battery state Lars-Peter Clausen
2011-02-06  0:48 ` [PATCH 09/14] POWER: bq27x00: Add new properties Lars-Peter Clausen
2011-02-06  0:48 ` [PATCH 10/14] POWER: bq27x00: Add MODULE_DEVICE_TABLE Lars-Peter Clausen
2011-02-06 16:49   ` Rodolfo Giometti
2011-02-06  0:48 ` [PATCH 11/14] POWER: bq27x00: Give more specific reports on battery status Lars-Peter Clausen
2011-02-06 16:38   ` Rodolfo Giometti
2011-02-06  0:48 ` [PATCH 12/14] POWER: bq27x00: Minor cleanups Lars-Peter Clausen
2011-02-06  0:48 ` [PATCH 13/14] POWER: bq27x00: Cleanup bq27x00_i2c_read Lars-Peter Clausen
2011-02-06  0:48 ` [PATCH 14/14] POWER: Ignore -ENODATA errors when generating a uevent Lars-Peter Clausen
2011-02-06 22:47 ` [PATCH 00/14] POWER: BQ27x00: New Properties, fixes, bq27000 support Felipe Contreras
2011-02-06 23:09   ` Lars-Peter Clausen
2011-02-07  0:00     ` Felipe Contreras
2011-02-07  0:12       ` Lars-Peter Clausen
2011-02-07 10:52     ` Pali Rohár
2011-02-07  0:58 ` Grazvydas Ignotas
2011-02-07  1:30   ` Lars-Peter Clausen
2011-02-08 11:40     ` Grazvydas Ignotas
2011-02-08 16:13       ` Lars-Peter Clausen [this message]
2011-02-08 16:28         ` Anton Vorontsov
2011-02-08 17:09           ` Lars-Peter Clausen

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