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Date: Mon, 1 Oct 2012 09:44:33 +0300
From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Zhang Rui <rui.zhang@intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        linux-pm <linux-pm@lists.linux-foundation.org>,
        linux-i2c <linux-i2c@vger.kernel.org>,
        "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        "Len, Brown" <lenb@kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>,
        Grant Likely <grant.likely@secretlab.ca>,
        Dirk Brandewie <dirk.brandewie@gmail.com>
Subject: Re: [RFC PATCH 0/6] ACPI: ACPI 5.0 device enumeration proposal
Message-ID: <20121001064433.GF15548@intel.com>
References: <1348817863.10877.320.camel@rui.sh.intel.com>
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On Fri, Sep 28, 2012 at 03:37:43PM +0800, Zhang Rui wrote:
> 
> the main idea is that, for Serial Buses like I2C and SPI, we enumerate
> the controller as a platform device, and then enumerate the slaves via
> i2c/spi_register_board_info. And then, when the controller is really
> probed and enabled in the platform driver, the SPI/I2C bus code will
> enumerate I2C/SPI slaves automatically.
> And for the other devices, we will enumerate all of them as platform
> devices, which is not covered in this patch set yet.

Can you show some example how we could use this new code for example with
an existing I2C/SPI slave driver? Let's say the device uses few GPIOs, one
for interrupt and other for triggering firmware download. In addition to
that it needs a special parameters that can be extracted running the "_DSM"
method of the device.

Normally the driver would get this stuff from the platform data or from
Device Tree but how it is done with these patches?