linux-kernel - Re: [PATCH 00/11] Convert GPIO Davinci to platform driver

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Date:	Tue, 11 Jun 2013 17:10:45 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	"Philip, Avinash" <avinashphilip@...com>
CC:	"khilman@...prootsystems.com" <khilman@...prootsystems.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/11] Convert GPIO Davinci to platform driver

On 6/11/2013 12:19 PM, Philip, Avinash wrote:
> On Tue, Jun 11, 2013 at 10:09:17, Nori, Sekhar wrote:
>>
>> On 6/10/2013 2:32 PM, Philip, Avinash wrote:
>>> On Fri, Jun 07, 2013 at 13:40:52, Nori, Sekhar wrote:
>>>> Hi Avinash,
>>>>
>>>> On 5/22/2013 12:40 PM, Philip Avinash wrote:
>>>>> GPIO Davinci driver converted to platform driver to support DT booting.
>>>>> In this patch series
>>>>> - Cleaned gpio Davinci driver code with proper commenting style and appropriate
>>>>>   variable names.
>>>>> - Create platform driver for GPIO Davinci in da8xx and dm* platforms and removed
>>>>>   gpio related member updation in davinci_soc_info structure.
>>>>> - DT support added for da850 board and tested on da850 EVM.
>>>>> - Remove soc_info reference in the gpio davinci driver and start uses
>>>>>   gpiolib interface.
>>>>
>>>> Can you please document which platforms this series was tested on and how?
>>>
>>> This series being tested on da850 EVM. Tested by setting VPIF_DOUT[12] as GPIO
>>> pin [2] and reading GPIO status from GPIO[7,4]
>>>
>>> GPIO[7,4] will reflect the status switch number 8 of the S7 dip switch in DA850 EVM.
>>>
>>> Testing Procedure
>>>
>>> Requirement GPIO SYSFS support [1]
>>>
>>> #echo 116 > /sys/class/gpio/export
>>> setting GPIO[7,4] as input GPIO
>>> #echo "in" > /sys/class/gpio/gpio116/direction
>>> #mount -t debugfs debugfs /sys/kernel/debug
>>> Reading GPIO pin status
>>> #cat /sys/kernel/debug/gpio
>>> #echo 116 > /sys/class/gpio/unexport
>>>
>>>
>>> 1. Enable GPIO SYSFS support through menconfig
>>> --- GPIO Support
>>> 	[ ]   Debug GPIO calls
>>>                [ ]   /sys/class/gpio/... (sysfs interface)
>>>  
>>> 2. Patch for pinmux support for GPIO[7,4] is available at
>>> https://github.com/avinashphilip/am335x_linux/commits/linux_davinci_v3.10_soc_gpio
>>
>> Can you check interrupt generation too since there are significant
>> changes in that area? You can generate an interrupt using the MMC/SD
>> card detect pin (inserting an MMC/SD card into the slot should generate
>> an interrupt). You can also write a new value to any GPIO pin. That will
>> also trigger an interrupt.
> 
> I have tested GPIO interrupt with GPIO[7,4] by inserting a kernel module in DA850 EVM.
> For GPIO interrupt generation DIP switch position changed.
> 
> Source code for GPIO test kernel module is shared at
> https://github.com/avinashphilip/am335x_linux/commit/affc0c1841beacd8430af689f7f12dcab0cbaf28

Thanks for the test report.

Regards,
Sekhar
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