What's the GPIO number of GPIO_WK3?

Connie Kuang

Other Parts Discussed in Thread: 4430

Dear sir,

I seems that the gpio number of gpio_wkn is n, So the gpio number of "sim_sd.gpio_wk3" should be 3. But I found another pin of "KPD_ROW2" whose GPIO number is 3 . If the gpio number of "sim_sd.gpio_wk3" is also be 3, it will be confused when invoking GPIO APIs. So what's the GPIO number of GPIO_WK3?

Thanks!

Connie kuang

over 13 years ago

0 Connie Kuang over 13 years ago

Intellectual 370 points

Sorry, it is "sim_cd.gpio_wk3", not "sim_sd.gpio_wk3" .

0 Gina Glaser over 13 years ago in reply to Connie Kuang

TI__Expert 8055 points

Connie,

You do use the value "n" when invoking the GPIO API's for gpio_wkn. You can find several examples in the Blaze Tablet board file (/arch/arm/mach-omap2/board-44xx-tablet.c, in the 4AI.1.3 release, for example):

 omap_mux_init_signal("fref_clk0_out.gpio_wk6", OMAP_PIN_OUTPUT);
 gpio_request(6, "msecure");
 gpio_direction_output(6, 1);

-------------------------------------------------------------

#define GPIO_WK30     30

 omap_mux_init_signal("fref_clk3_req.gpio_wk30", \
 OMAP_PIN_OUTPUT | \
 OMAP_PIN_OFF_NONE | OMAP_PULL_ENA);

 /* Enable 5V,1A USB power on external HS-USB ports */
 if (gpio_is_valid(GPIO_WK30)) {
 gpio_request(GPIO_WK30, "USB POWER GPIO");
 gpio_direction_output(GPIO_WK30, 1);
 gpio_set_value(GPIO_WK30, 0);
 }

In the case that you mentioned, there should not be an issue since you can only use gpio_wk3 or gpio_3 at once.

See section 25.2.2 in the TRM:

NOTE: Users must not use a GPIO channel through two device pads simultaneously. Channels that
can be mapped on two different device pads are:
• GPIO[3:0] of the GPIO1 module (signals gpio_[3:0] or gpio_wk[3:0]; each can be routed
to a different device pad). See Figure 25-4.
• GPIO[8:4] of the GPIO4 module (signals gpio_[104:100]; each can be routed to two
different device pads)
Therefore, appropriate configuration must be done through the pad configuration registers.
See Section 18.4.8, Pad Functional Multiplexing and Configuration, in Chapter 18, Control
Module.

Regards,

Gina

0 Israel Cepeda over 13 years ago in reply to Connie Kuang

TI__Expert 5515 points

Hi Connie,

Can you provide more info on where are you seeing that?, I am only seeing one gpio_wk3 in OMAP 4430 TRM.

0 Connie Kuang over 13 years ago in reply to Gina Glaser

Intellectual 370 points

Thanks, Gina!

0 Connie Kuang over 13 years ago in reply to Israel Cepeda

Intellectual 370 points

Hi Israel

The two device pad I mentioned above are "sim_sd.gpio_wk3" and "kpd_row2.gpio_3". Thanks!

Connie Kuang

0 Egor Rumjantsev over 13 years ago in reply to Gina Glaser

Intellectual 825 points

Hello, Gina.

What settings i have to use for gpio_wk1 line if i want to use this gpio as wakeup source?

Let's suppose that i don't need gpio_1 but i need gpio_wk1...so i configure gpio_wk1 as following:

omap_mux_init_signal("sim_clk.gpio_wk1", OMAP_PIN_INPUT | OMAP_WAKEUP_EN |
OMAP_WAKEUP_EVENT); /* gpio_wk1 */

and what mux settings i have to set to gpio_1 pad to switch off it and activate gpio_wk1?

WBR,

0 Gina Glaser over 13 years ago in reply to Egor Rumjantsev

TI__Expert 8055 points

Hi Egor,

I will address these questions on your other thread for this topic, here: http://e2e.ti.com/support/omap/f/849/p/189398/680385.aspx#680385

Regards,

Gina

0 Li over 12 years ago in reply to Gina Glaser

Prodigy 90 points

hi,

i am using gpio_wk3 as one of the input pin in my project. i tried to execute the following commands:

echo 3 > /sys/class/gpio/export

echo in > /sys/class/gpio/gpio3/direction

but i cannot see gpio3 class is created. May i know what is the proper way to do this?

Thanks a lot.

0 Egor Rumjantsev over 12 years ago in reply to Li

Intellectual 825 points

Hi.

All this commands correct but first you have to set up pinmux.

You can write it some driver or board platform file.

For example i set pinmux for GPIO3 (not GPIO_WK3)

omap_mux_init_signal( "kpd_row2.gpio_3", OMAP_MUX_MODE3 | OMAP_PIN_INPUT | OMAP_WAKEUP_EN); /* gpio_3 */
omap_mux_init_signal( "sim_cd.gpio_wk3", OMAP_MUX_MODE7 | OMAP_PIN_INPUT); /* gpio_wk3 */

If you need exactly GPIO_WK3 you can put GPIO3 in MUX_MODE7 and make GPIO_WK3 as regular gpio OMAP_MUX_MODE3.

Also i can thry to do such mux in runtime with devmem2 programm - you have to find out register number for GPIO3 and GPIO_WK3 in TRM

WBR,

0 Li over 12 years ago in reply to Egor Rumjantsev

Prodigy 90 points

Hi Egor,

Thanks for the reply.

i already configure the pinmux for gpio_wk3 in MUX_MODE7. but the still facing the same problem.

May you advice me on this?

Thanks again.

0 Egor Rumjantsev over 12 years ago in reply to Li

Intellectual 825 points

Hi.

May be my English not correct :)

If you want to use GPIO_WK3 you have to set MUX_MODE3, not MUX_MODE7.

WBR,

0 Li over 12 years ago in reply to Egor Rumjantsev

Prodigy 90 points

Hi Egor,

Sorry, my mistake. i already configure GPIO_WK3 to MUX_MODE3.

Really sorry on that.

0 Egor Rumjantsev over 12 years ago in reply to Li

Intellectual 825 points

Then i can't help with this...sorry.

I've always exported gpio from drivers or kernel board platform file.

In this cases it worked for me.

Try to check if pinmux register set up correctly....may be someone change you mux.

Use devmem2 or other same utility

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What's the GPIO number of GPIO_WK3?