linux-kernel - Re: [RFC v2 2/2] i2c: Pass i2c_device_id to probe func when using DT ids through ACPI

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Message-ID: <20160610070424.GA1552@katana>
Date:	Fri, 10 Jun 2016 09:04:24 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Crestez Dan Leonard <leonard.crestez@...el.com>
Cc:	linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, linux-i2c@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Irina Tirdea <irina.tirdea@...el.com>,
	Octavian Purdila <octavian.purdila@...el.com>,
	Daniel Baluta <daniel.baluta@...el.com>
Subject: Re: [RFC v2 2/2] i2c: Pass i2c_device_id to probe func when using DT
 ids through ACPI

On Thu, Jun 09, 2016 at 04:06:03PM +0300, Crestez Dan Leonard wrote:
> When devices are instatiated through devicetree the i2c_client->name is
> set to the compatible string with company name stripped out. This is
> then matched to the i2c_device_id table to pass the device_id to the
> probe function. This id parameter is used by some device drivers to
> differentiate between model numbers.
> 
> When using ACPI this id parameter is NULL and the driver usually needs
> to do ACPI-specific differentiation.
> 
> This patch attempts to find a valid i2c_device_id when using ACPI with
> DT-like compatible strings.

Note that this DT behaviour is about to be dropped to match I2C with
the "generic" behaviour".

https://lkml.org/lkml/2016/5/4/534


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