linux-kernel - RE: [Linaro-acpi] How to pass I2C platform

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Date:	Thu, 3 Apr 2014 13:59:18 +0000
From:	"Pallala, Ramakrishna" <ramakrishna.pallala@...el.com>
To:	"mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
	"Arnd Bergmann" <arnd@...db.de>
CC:	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Linaro-acpi] How to pass I2C platform_data under ACPI

>> > > And initialize the platform data in either driver or in separate 
>> > > module which gets compiled along with driver?
>> > 
>> > Typically it has been done in the same driver but I don't see any 
>> > problems having a separate module as well.
>> > 
>> > > static const struct acpi_device_id my_acpi_match[] = {
>> > >       { "MYID0001", (kernel_ulong_t)&my_platform_data1 }
>> > >       { "MYID0002", (kernel_ulong_t)&my_platform_data2 }
>> > >       ...
>> > >       { },
>> 
>> We definitely don't want per-board match entries, that does not scale.
>> The driver should be reasonably generic and get all the necessary data 
>> out of well-defined tables. You can have different IDs when there are 
>> only a few cases that are actually relevant, but it has to be 
>> conceivable that the same driver get used on future hardware without 
>> changes.
>
>Yes, I meant that when the platform data information is not available in ACPI namespace, then (and only then) pass the data by means of different IDs.
>
>Preferably this information is included in the ACPI namespace.

The idea is use the single platform_data struct  and initiaze it accordingly from the driver's __init call based on the board/platform.

Thanks for your inputs.
Ram.
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