linux-kernel - Re: How to pass I2C platform

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Message-ID: <20140403113832.GD19349@intel.com>
Date:	Thu, 3 Apr 2014 14:38:33 +0300
From:	"mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>
To:	"Pallala, Ramakrishna" <ramakrishna.pallala@...el.com>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: How to pass I2C platform_data under ACPI

On Thu, Apr 03, 2014 at 11:25:34AM +0000, Pallala, Ramakrishna wrote:
> >> In non ACPI environment I used to initialize the platform_data under 
> >> board or platforms files. Under ACPI how do I do that?
> >
> >If you can't extract that information from ACPI namespace, then one option is to pass platform data along with the device ACPI ID:
> >
> >static const struct acpi_device_id my_acpi_match[] = {
> >	{ "MYID0001", (kernel_ulong_t)&my_platform_data }
> >	...
> >	{ },
> >};
> 
> Thanks for the Quick reply.
> 
> So If I  want to use different platform_data for different boards can I
> do something like below?

Exactly.

> 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 }
> 	...
> 	{ },
> 
> Thanks,
> Ram
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