linux-kernel - Re: [Patch V3 0/5] I2C ACPI operation region handler

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Date:	Wed, 21 May 2014 10:16:13 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	wsa@...-dreams.de, mika.westerberg@...ux.intel.com,
	awilliam@...hat.com, lenb@...nel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [Patch V3 0/5] I2C ACPI operation region handler

On 2014年05月21日 05:25, Rafael J. Wysocki wrote:
> On Tuesday, May 20, 2014 08:59:19 PM Lan Tianyu wrote:
>> ACPI 5.0 spec(5.5.2.4.5) defines GenericSerialBus(i2c, spi, uart) operation
>> region. It allows ACPI aml code able to access such kind of devices to
>> implement some ACPI standard method.
>>
>> On the Asus T100TA, Bios use GenericSerialBus operation region to access
>> i2c device to get battery info. So battery function depends on the I2C
>> operation region support. Here is the bug link.
>> https://bugzilla.kernel.org/show_bug.cgi?id=69011
>>
>> Change since V2:
>>         Drop patchs of adding I2C smbus quick read/write and word/block
>> process call functions because not find machines supporting such protocols
>> so far and can't test these functions.
>>         Merge patchs of "I2C ACPI related code clear up" and "Add CONFIG_I2C_ACPI
>> config"
>> 	Patch 2: Add acpi_bus_detach_private_data() function to detach data from
>> ACPI handle and replace ACPI_ERROR() with acpi_handle_debug() to avoid some redundant
>> error log.  
>>
>> Change since V1:
>>        Fix some code style issues. Change prefix i2c_acpi to acpi_i2c.
>> Move ACPI related code in the i2c core to i2c-acpi.c. Add CONFIG_I2C_ACPI
>> and make i2c core built-in when it's set to avoid i2c ACPI operation region
>> being removed.
>>
>> Lan Tianyu (5):
>>   ACPICA: Export acpi_buffer_to_resource symbol
> 
> Redundant?

Yes.

> 
>>   ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data
>>     to ACPI handle
>>   ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private
>>     data
> 
> I can take the above two regardless of the I2C material below I guess?

Yes.

> 
>>   I2C/ACPI: Add i2c ACPI operation region support
>>   I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config
>>
>>  drivers/acpi/acpica/rscreate.c |   1 +
>>  drivers/acpi/bus.c             |  28 +++-
>>  drivers/acpi/thermal.c         |  11 +-
>>  drivers/i2c/Kconfig            |  18 +-
>>  drivers/i2c/Makefile           |   5 +-
>>  drivers/i2c/i2c-acpi.c         | 362 +++++++++++++++++++++++++++++++++++++++++
>>  drivers/i2c/i2c-core.c         |  97 +----------
>>  include/acpi/acpi_bus.h        |   2 +
>>  include/linux/acpi.h           |  11 ++
>>  include/linux/i2c.h            |  12 ++
>>  10 files changed, 439 insertions(+), 108 deletions(-)
>>  create mode 100644 drivers/i2c/i2c-acpi.c
>>
>>
> 


-- 
Best regards
Tianyu Lan
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