linux-kernel - RE: Fwd: Hid over I2C and ACPI interaction

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Message-ID: <94F2FBAB4432B54E8AACC7DFDE6C92E346B0A606@ORSMSX101.amr.corp.intel.com>
Date:	Mon, 9 Jul 2012 04:02:25 +0000
From:	"Moore, Robert" <robert.moore@...el.com>
To:	"Lan, Tianyu" <tianyu.lan@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	"Zhang, Rui" <rui.zhang@...el.com>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"ben-linux@...ff.org" <ben-linux@...ff.org>,
	"w.sang@...gutronix.de" <w.sang@...gutronix.de>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jkosina@...e.cz" <jkosina@...e.cz>,
	"chatty@...c.fr" <chatty@...c.fr>,
	"jj_ding@....com.tw" <jj_ding@....com.tw>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"abelay@....edu" <abelay@....edu>,
	"Lin, Ming M" <ming.m.lin@...el.com>,
	"Tang, Feng" <feng.tang@...el.com>
Subject: RE: Fwd: Hid over I2C and ACPI interaction

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@...r.kernel.org [mailto:linux-acpi-
>owner@...r.kernel.org] On Behalf Of Lan Tianyu
>Sent: Sunday, July 08, 2012 8:25 PM
>To: Mika Westerberg
>Cc: Zhang, Rui; khali@...ux-fr.org; ben-linux@...ff.org;
>w.sang@...gutronix.de; lenb@...nel.org; linux-acpi@...r.kernel.org; linux-
>i2c@...r.kernel.org; linux-kernel@...r.kernel.org; jkosina@...e.cz;
>chatty@...c.fr; jj_ding@....com.tw; bhelgaas@...gle.com; abelay@....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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