From: ml.lawnick@gmx•de (Michael Lawnick)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or ACPI'ed devices
Date: Wed, 04 Jun 2014 08:09:31 +0200 [thread overview]
Message-ID: <538EB81B.3090807@gmx.de> (raw)
In-Reply-To: <CACRpkdbo9_xo6j7JBcjiuk6eYkqyaeMYLFsH3VczxotOmVRh1Q@mail.gmail.com>
Am 03.06.2014 13:18, schrieb Linus Walleij:
> On Mon, Jun 2, 2014 at 4:29 PM, Michael Lawnick <ml.lawnick@gmx•de> wrote:
>> Am 02.06.2014 14:16, schrieb Linus Walleij:
>
>>> Is this really so useful on embedded systems?
>>>
>>> I was under the impression that this method was something used
>>> on say PC desktops with temperature monitors and EEPROMs
>>> on some I2C link on the PCB, usage entirely optional and fun
>>> for userspace hacks.
>>>
>> We use it for dynamic instantiating whole subsystems with multiplexers,
>> sensors, controllers in an embedded system. The device list is taken from an
>> I2C eeprom which gets read on hotplug.
>
> Does this mean that you have stored the names (strings) that are used
> by the Linux kernel for identifying the devices into your EEPROM?
>
> That means that you have made the kernel-internal device driver names
> an ABI which is unfortunate :-/
>
> This is one of the reasons to why we insist on device tree: OS neutral
> hardware description.
The eeprom contains a device tree that is dynamically merged.
KR
Michael
next prev parent reply other threads:[~2014-06-04 6:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-30 12:26 [PATCH 0/{1,1}] i2c: Make I2C ID tables non-mandatory for DT/ACPI Lee Jones
2014-05-30 12:26 ` [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or ACPI'ed devices Lee Jones
2014-05-30 12:36 ` Wolfram Sang
2014-05-30 12:55 ` Lee Jones
2014-05-30 13:34 ` Lee Jones
2014-05-30 17:48 ` Wolfram Sang
2014-05-30 19:25 ` Lee Jones
2014-05-31 13:48 ` Wolfram Sang
2014-06-02 12:16 ` Linus Walleij
2014-06-02 12:38 ` Wolfram Sang
2014-06-02 13:26 ` Linus Walleij
2014-06-02 13:26 ` Lee Jones
2014-06-02 14:29 ` Michael Lawnick
2014-06-03 11:18 ` Linus Walleij
2014-06-04 6:09 ` Michael Lawnick [this message]
2014-06-12 7:55 ` Linus Walleij
2014-06-12 9:28 ` Michael Lawnick
2014-05-30 12:26 ` Lee Jones
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