TI811x gpio0_10 issues, cant control with Kernel Console

Alfred Espinosa

Hi All,

I'm using Linux-2.6.37 with psp04.07.00.02 and i need to control GPIO0[10] but is always sitting in 1 volt, if i try to control with:

echo 10 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio10/direction
echo 0 > sys/class/gpio/gpio10/value

and seems that i'm not able to control that line

The pin for that gpio is:

PINCNTL156 0x48140A6C

and i init the pinmux with:

omap_mux_init_signal("vin0_d16_ti811x.gpio0_10",0)

and seems that i was unsuccessfull.

tried also with:

omap_mux_init_signal("vin0_d16_ti811x.gpio0_10_mux0",0)

and still unsuccessfull.

Can someone suggest a way/ways i can control that GPIO? thanks in advance

PD: I tried to unenable in devices.c

omap_writel(0x1,0x48140a6c)

and didin't work.

over 10 years ago

0 Prabhakar Lad over 10 years ago

Guru 11260 points

Hi,

Can you try setting up this pin in u-boot ? there is a file mux.h which is self understandable in (board/ti/ti8148/mux.h), Once you have changed that in uboot remove the kernel changes which you did above and try exporting and setting the values.

Cheers,
--Prabhakar Lad

0 Alfred Espinosa over 10 years ago in reply to Prabhakar Lad

Intellectual 570 points

hi Prabhakar Lad,

i went instead to board/ti/ti811x/pinmux.h and i found this:

MUX_VAL(PINCNTL156,(IEN | IPU | FCN8)) /*GP0[10]_MUX0*/

That was by default, is that the file that you mean? is it enabled already? the file you said had things like bit(0),bit(0),bit(0),bit(6),0,0,0,bit(0),bit(0) which i didn't understood.

Thanks in Advance again

0 Prabhakar Lad over 10 years ago in reply to Alfred Espinosa

Guru 11260 points

Hi,

Which board are you using is it a 8148/8168 ?

Cheers,
--Prabhakar Lad

0 Prabhakar Lad over 10 years ago in reply to Prabhakar Lad

Guru 11260 points

Or 811x which is derivative of 814x family ?

Cheers,
--Prabhakar Lad

0 Alfred Espinosa over 10 years ago in reply to Prabhakar Lad

Intellectual 570 points

DR62x says the technical reference manual

0 Alfred Espinosa over 10 years ago in reply to Alfred Espinosa

Intellectual 570 points

ti811x it is

0 Prabhakar Lad over 10 years ago in reply to Alfred Espinosa

Guru 11260 points

Hi,

Which uboot code repository are you looking at is it a PSP release ?

Cheers,
--Prabhakar Lad

0 Alfred Espinosa over 10 years ago in reply to Prabhakar Lad

Intellectual 570 points

I'm not sure is psp04.07.00.02 the answer you are looking for?

u-boot-2010.06- psp04.07.00.02

0 Prabhakar Lad over 10 years ago in reply to Alfred Espinosa

Guru 11260 points

Can you print the value at pinctl156 when uboot comes up ? (using md command )

Cheers,
--Prabhakar Lad

0 Alfred Espinosa over 10 years ago in reply to Prabhakar Lad

Intellectual 570 points

let me get you that information, it will take me some time, thanks a lot for your help

0 Yanko Todorov-XID over 10 years ago in reply to Alfred Espinosa

TI__Mastermind 29520 points

Hello Alfred,

Could you explain what type of hardware/board you use?

GPIO0 10 is connected to two pads L28 and AE10 pad on DRA62x.

I suggest you to check your driver configuration if GPIO driver is enabled.

To enable or disable GPIO driver from kernel build, follow these steps:

1. Run the menuconfig

Select Device Drivers from the main menu.
Power management options
[*] Networking support --->
Device Drivers --->

Select GPIO Support from the menu.
PPS support --->
PTP clock support --->
-*- GPIO Support --->

Sysfs entries configuration
GPIO can be access using SYSFS entries from User Space. For that Select /sys/class/gpio/... (sysfs interface) from
the GPIO support.
[ ] Debug GPIO calls
[*] /sys/class/gpio/... (sysfs interface)

User Space - Sysfs control
• Enable GPIO sysfs support in kernel configuration and build the kernel
Device Drivers
---> GPIO Support
---> /sys/class/gpio/... (sysfs interface)

Best regards,

Yanko

0 Alfred Espinosa over 10 years ago in reply to Yanko Todorov-XID

Intellectual 570 points

Hi Yanko,

The Ball is L28, and the gpio driver is enabled.

I re-check all your suggestions and they mach (they were enabled) my problem is that, when the kernel starts that pin gpio0_10 is sitting in 1-1.5 volts and cant control it with the copnsole (sys/class/gpio)

0 Yanko Todorov-XID over 10 years ago in reply to Alfred Espinosa

TI__Mastermind 29520 points

Hello Alfred,

Could you send me your electrical schematic to check how is connected GPIO0_10 pin?

Could you check if GPIO0 clock is enabled by register CM_ALWON_GPIO_0_CLKCTRL[1:0] MODULEMODE - 0x2

Check in linux-2.6.37-psp04.07.00.02/arch/arm/mach-omap2/omap_hwmod_81xx_data.c

I check that GPIO_0 doesn't have definitions in this file.

Best regards,
Yanko

0 Alfred Espinosa over 10 years ago in reply to Yanko Todorov-XID

Intellectual 570 points

Hey Yanko, Prabhakar Lad,

Seems that i fixed the issue in late Friday, sorry for the late response.

The issues were:

devices.c drivers for cam (cam_8)
devices.c (video in: Vin)
devices.c (video out: vout)
A .ko file that sets another pinmux for the system in one of the working carpets that had the code

ptr=remap(PINCNTL(156));

WR_MEM_32(ptr,0x60001);

So, all of those, make the same issue , by removing every single of them my issue got fixed, the devices.c seems part of the kernel bi the ti-ezsdk, but the *.ko file seems from us, so it would be really hard for someone here to notice that.

Thanks again for your help (to all), with that i could be sure that your suggestions weren't the problems and i moved foward to fixing this issue

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TI811x gpio0_10 issues, cant control with Kernel Console