linux-kernel - Re: [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or ACPI'ed devices

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Message-ID: <20140530192516.GA4319@lee--X1>
Date:	Fri, 30 May 2014 20:25:16 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	grant.likely@...aro.org, linus.walleij@...aro.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or
 ACPI'ed devices

> > Would you mind telling me what I have changed that affects drivers
> > registering via Sysfs?
> 
> Check Documentation/i2c/instantiating-devices, method 4. If a driver
> does not have i2c_device_id, then this method won't work because the
> newly created device has no of_node or ACPI_node and nothing will match.
> Looking at the bigger picture, I'd really like to keep this feature.
> People use it.

Right, I read the function which provides the functionality, but my
point is; I don't think my patch changes the semantics in a way which
would adversely affect this option.  If you think that it does, can you
specify how please?

Does the sysfs method create a i2c_device_id table?  If not, how does
it probe successfully pre-patch?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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