question about DMtimer, how to use 2 DMtimer in 1 module?

yuri exi

Intellectual 865 points

Dear sir

question about DMtimer, how to use 2 DMtimer in 1 moudle?

I tested the timer 1 and 2.

There is no problem at the time of each operation.

But I do not know how to initialize a timer two well.

1. .dts file

//===================================

am33xx_module_timer4 {
  compatible = "am33xx_module_timer4";
  status = "okay";
  pinctrl-names = "default";
  pinctrl-0 = <&timer4_pins_default>;
  pinctrl-1 = <&timer4_pins_sleep>;
  DMtimer4 = <&timer4>;
};

am33xx_module_timer7 {
  compatible = "am33xx_module_timer4";
  status = "okay";
  pinctrl-names = "default";
  pinctrl-0 = <&timer7_pins_default>;
  pinctrl-1 = <&timer7_pins_sleep>;
  DMtimer7 = <&timer7>;
};

//=======================================

2. module inital

//=======================================

static int print_module_init(struct platform_device *pdev)

{

/* Attempt to request a timer based on the device node */
timer_device_node = of_parse_phandle(pdev->dev.of_node, "DMtimer4", 0);
SGTDev.timer_ptr = omap_dm_timer_request_by_node(timer_device_node);

if(SGTDev.timer_ptr == NULL){
  /* no timers available */
  printk(KERN_INFO "Can't request specified DM Timer\n");
  return -1;
}

.
/* Attempt to request a timer based on the device node */
timer_device_node = of_parse_phandle(pdev->dev.of_node, "DMtimer7", 1);
SGTDev.timer7_ptr = omap_dm_timer_request_by_node(timer_device_node);

if(SGTDev.timer_ptr7 == NULL){
  /* no timers available */
  printk(KERN_INFO "Can't request specified DM Timer\n");
  return -1;
}

}

static const struct of_device_id test_module_timer_of_match[] = {
{ .compatible = "am33xx_module_timer4" },
};

//============================================

What should I do to fix it?

best regards

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

I will ask the Linux team to check this.

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,

Which SDK release is this? I couldn't find the code fragments in 2. module inital when I ran grep command in the kernel sources of the latest TI SDK, I guess you've customized the driver.

Also the timer device tree nodes seem strange to me.. In official TI releases you have the following definition in am33xx.dtsi:

timer4: timer@48044000 {

compatible = "ti,am335x-timer";

reg = <0x48044000 0x400>;

interrupts = <92>;

ti,hwmods = "timer4";

ti,timer-pwm;

};

AND

timer7: timer@4804a000 {

compatible = "ti,am335x-timer";

reg = <0x4804a000 0x400>;

interrupts = <95>;

ti,hwmods = "timer7";

ti,timer-pwm;

};

To enable timer4 & timer7 in your kernel you need to add pinmux settings & the following two nodes in your .dts file:

&timer4 {

pinctrl-names = "default";

pinctrl-0 = <&timer4_pins_default>;

status = "okay";

}

&timer7 {

pinctrl-names = "default";

pinctrl-0 = <&timer7_pins_default>;

status = "okay";

}

And the dmtimer driver will initialize both timers without modifying it.

Best Regards,

Yordan

0 yuri exi over 9 years ago in reply to Yordan Kovachev

Intellectual 865 points

hi

First of all, thank you for your thoughtful response.

but I still have problems with the DMtimer.

I have same problems.

1. .dts file

timer4 {
compatible = "ti,am335x-timer";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&timer4_pins_default>;
pinctrl-1 = <&timer4_pins_sleep>;
DMtimer = <&timer4>;
};

timer7 {
compatible = "ti,am335x-timer";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&timer7_pins_default>;
pinctrl-1 = <&timer7_pins_sleep>;
DMtimer1 = <&timer7>;
};

2. module .C file

timer_device_node = of_parse_phandle(pdev->dev.of_node, "DMtimer", 0);

SGTDev.timer_ptr = omap_dm_timer_request_by_node(timer_device_node);

if(SGTDev.timer_ptr == NULL){

printk( "\n\nCan't request specified DM Timer4\n\n");
return -1;
}
else
{
printk( "\n\nOK request specified DM Timer4\n\n");
}

timer_device_node = of_parse_phandle(pdev->dev.of_node, "DMtimer1", 1);

SGTDev.stb = omap_dm_timer_request_by_node(timer_device_node);

if(SGTDev.stb == NULL){
printk( "\n\nCan't request specified DM Timer7\n\n");
return -1;
}
else
{
printk( "\n\nOK request specified DM Timer7\n\n");

}

3. match table

static const struct of_device_id test_module_timer_of_match[] = {
{ .compatible = "ti,am335x-timer" },
};

4. error message[ 24.134385] DM timer1: starting moudle init
[ 24.139298] OK request specified DM Timer4
[ 24.152860] Can't request specified DM Timer7
[ 24.162884] timer irq: probe of timer4.10 failed with error -1

I ask you for a check of the above problems.

Thank you for answer.

0 Amey Ghanekar over 9 years ago in reply to yuri exi

Prodigy 200 points

Does anyone find the solution of above problem?
I have gone through DMTimer.c file and understood that you can request timer by either id or timer capability or node. I have tried all three methods, but still not able to configiure specified timer. I want to configure timer 7 for input capture functionality. I'm using beaglebone black with following configuration
Ti sdk = 02.00.01.07
uname -r = linux-4.1.13
Can anyone shed light on this issue??
Regards,
Amey

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question about DMtimer, how to use 2 DMtimer in 1 module?