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

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Date:	Tue, 11 Jun 2013 06:49:27 +0000
From:	"Philip, Avinash" <avinashphilip@...com>
To:	"Nori, Sekhar" <nsekhar@...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 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

> 
> It will be nice if you can test this series on DM365 as well (read/write
> as well as interrupt).

Don't have any DM365 board for testing.

Thanks
Avinash

> 
> Thanks,
> Sekhar
>