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SubjectRE: Fwd: Hid over I2C and ACPI interaction
Date
These are already defined in acpica - in the file acrestyp.h

ACPI_RESOURCE_FIXED_DMA FixedDma;

ACPI_RESOURCE_GPIO Gpio;
ACPI_RESOURCE_I2C_SERIALBUS I2cSerialBus;
ACPI_RESOURCE_SPI_SERIALBUS SpiSerialBus;
ACPI_RESOURCE_UART_SERIALBUS UartSerialBus;
ACPI_RESOURCE_COMMON_SERIALBUS CommonSerialBus;



>-----Original Message-----
>From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
>owner@vger.kernel.org] On Behalf Of Lan Tianyu
>Sent: Sunday, July 08, 2012 8:25 PM
>To: Mika Westerberg
>Cc: Zhang, Rui; khali@linux-fr.org; ben-linux@fluff.org;
>w.sang@pengutronix.de; lenb@kernel.org; linux-acpi@vger.kernel.org; linux-
>i2c@vger.kernel.org; linux-kernel@vger.kernel.org; jkosina@suse.cz;
>chatty@enac.fr; jj_ding@emc.com.tw; bhelgaas@google.com; abelay@mit.edu
>Subject: Re: Fwd: Hid over I2C and ACPI interaction
>
>On 2012年07月06日 13:52, Mika Westerberg wrote:
>> On Thu, Jul 05, 2012 at 03:01:57PM +0800, Zhang Rui wrote:
>>> +Note that although these are ACPI devices, we prefer to use PnP drivers
>>> for them,
>>> +this is because:
>>> +1. all the non-ACPI-predefined Devices are exported as PnP devices as
>>> well
>>> +2. PnP bus is a well designed bus. Probing via PnP layer saves a lot of
>>> work
>>> + for the device driver, e.g. getting& parsing ACPI resources.
>>
>> (Nice BKM, thanks for sharing)
>>
>> I have few questions about using PnP drivers instead of pure ACPI
>drivers.
>>
>> ACPI 5.0 defined some new resources, for example "Fixed DMA descriptor"
>> that has information about the request line + channel for the device to
>> use. Hovewer, PnP drivers pass resources as 'struct resource', which
>> basically only has start and end - how do you represent all this new
>stuff
>> using 'struct resource'?
>>
>I think we can add new interface to get acpi specific resources. e.g
>struct acpi_resource pnp_get_acpi_resource(...). When the pnp acpi devices
>were initialized, put those acpi specific resources into a new resource
>list
>pnpdev->acpi_resources. What pnp_get_acpi_resource does is to get specified
>type acpi resources and return. We also need to define some acpi resource
>types.
>
>ACPI_RESOURCE_DMA
>ACPI_RESOURCE_I2C_SERIALBUS
>ACPI_RESOURCE_SPI_SERIALBUS
>ACPI_RESOURCE_UART_SERIALBUS
>ACPI_RESOURCE_COMMON_SERIALBUS
>...
>
>How about this? welcome to comments.
>
>> Or should we use acpi_walk_resources() where 'struct resource' is not
>> suitable?
>>
>
>--
>Best Regards
>Tianyu Lan
>linux kernel enabling team
>--
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