From: Wolfgang Grandegger <wg@grandegger.com>
To: "Albrecht Dreß" <albrecht.dress@arcor.de>
Cc: Linux PPC Development <linuxppc-dev@ozlabs.org>,
Devicetree Discussions <devicetree-discuss@lists.ozlabs.org>,
"Ben Dooks \(embedded platforms\)" <ben-linux@fluff.org>
Subject: Re: [PATCH/RFC 2/2] 5200: improve i2c bus error recovery
Date: Tue, 26 Jan 2010 08:33:35 +0100 [thread overview]
Message-ID: <4B5E9ACF.7000206@grandegger.com> (raw)
In-Reply-To: <1264451219.2315.1@antares>
Albrecht Dreß wrote:
> Am 25.01.10 08:55 schrieb(en) Wolfgang Grandegger:
>> Albrecht Dreß wrote:
>>> Make the I2C adapter timeout configurable through a Device Tree
>>> property which gives the timeout in microseconds.
>>
>> My understanding is that software properties should not be defined via
>> the device tree. I think a sysfs entry is more appropriate.
>
> Is the timeout really a /software/ property? My feeling is that the
> timeout basically depends upon the bus clock and the chips attached to
> the bus. Therefore, it is linked closer to the composition of the
> board's hardware as described in the device tree, than to any userland
> software. Or am I totally wrong here?
Well, yes, it seems to be a border case.
Wolfgang.
WARNING: multiple messages have this Message-ID (diff)
From: Wolfgang Grandegger <wg@grandegger.com>
To: "Albrecht Dreß" <albrecht.dress@arcor.de>
Cc: Linux PPC Development <linuxppc-dev@ozlabs.org>,
Devicetree Discussions <devicetree-discuss@lists.ozlabs.org>,
"Ben Dooks (embedded platforms)" <ben-linux@fluff.org>
Subject: Re: [PATCH/RFC 2/2] 5200: improve i2c bus error recovery
Date: Tue, 26 Jan 2010 08:33:35 +0100 [thread overview]
Message-ID: <4B5E9ACF.7000206@grandegger.com> (raw)
In-Reply-To: <1264451219.2315.1@antares>
Albrecht Dreß wrote:
> Am 25.01.10 08:55 schrieb(en) Wolfgang Grandegger:
>> Albrecht Dreß wrote:
>>> Make the I2C adapter timeout configurable through a Device Tree
>>> property which gives the timeout in microseconds.
>>
>> My understanding is that software properties should not be defined via
>> the device tree. I think a sysfs entry is more appropriate.
>
> Is the timeout really a /software/ property? My feeling is that the
> timeout basically depends upon the bus clock and the chips attached to
> the bus. Therefore, it is linked closer to the composition of the
> board's hardware as described in the device tree, than to any userland
> software. Or am I totally wrong here?
Well, yes, it seems to be a border case.
Wolfgang.
next prev parent reply other threads:[~2010-01-26 7:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-22 20:18 [PATCH/RFC 2/2] 5200: improve i2c bus error recovery Albrecht Dreß
2010-01-22 20:18 ` Albrecht Dreß
2010-01-25 7:55 ` Wolfgang Grandegger
2010-01-25 7:55 ` Wolfgang Grandegger
2010-01-25 20:26 ` Albrecht Dreß
2010-01-25 20:26 ` Albrecht Dreß
2010-01-26 7:33 ` Wolfgang Grandegger [this message]
2010-01-26 7:33 ` Wolfgang Grandegger
2010-02-16 19:33 ` Grant Likely
2010-02-16 19:33 ` Grant Likely
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