AM6442: Sharing MAIN GPIO interrupt between r5f and a53

And what are the routings for?

should this be enough?

&main_gpio_intr {
   status = „reserved“;
};

Hallo Tushar,

the thread about interrupt routing does not write anything about the devicetree. 

Should it be enough for me to change the router no. 0 to the r5f core in the Resource Management file?

And what about resouce sharing?

Regards,

Artur

Hi,

when I add this to my device tree:

&main_gpio_intr {
   status = "reserved";
};

I can't use gpios in linux at all.

We are trying to get an interrupt from peripheral gpio 1:



Therefore a thought I had to reserve the main_gpio_intr in the device tree.

Should it be enough to reserve the mcu_gpio_intr in the device tree and set the correct routing in the resource management file?

Regards,

Artur

Hello Artur,

I see you are trying to get an interrupt from GPIO1, on that note, based on your above response looks like you are on TMDS64EVM. 

I would like to know if the GPIO line you would be interested in is highlighted in one of the green section marked in the Attachment 1 below.

NOTE: I am asking this because in SysConfig attachment you sent above, the GPIO pin is configured to SoC_I2C1.

Attachment 1

Looking forward to your response.

Regards,

Vaibhav

Hi,

no, we are using our custom board. We do not use the i2c1.

The gpio-pin is not used used in linux:

&main_gpio1 {	
	gpio-line-names = "", "", "", "", "", /* 0 */
		"", "", "", "", "", 
		"", "", "", "", "", /* 10 */
		"", "", "nLATCH", "", "DO_EN",
		"", "", "", "", "", /* 20 */
		"", "", "LED_rd_LP1_CAN", "", "",
		"", "", "", "", "", /* 30 */
		"", "", "LED_gn_LP1_CAN", "", "",
		"", "", "", "", "", /* 40 */
		"", "", "", "", "",
		"", "", "", "", "", /* 50 */
		"", "", "", "", "",
		"", "", "", "", "", /* 60 */
		"", "", "", "", "",
		"", "", "", "", "", /* 70 */
		"", "", "", "", "",
		"", "", "", "", "", /* 80 */
		"", "";
};

Hello Artur,

Thanks for sharing the above details.

I am routing your query to one of our team member who is more familiar with Linux development.

Please expect a response in a day or two.

Regards,

Tushar

Hi Artur,

Artur Toews said:

&main_gpio_intr {
   status = "reserved";
};

I can't use gpios in linux at all.

Yes, by doing this, Linux will block you from accessing all Main Domain GPIOs.

You should only need to reserve the MCU GPIOs to make sure no other core is accessing them.

Thanks,
Anshu

Hi Anshu,

Ok. So I just have to do the interrupt routing correctly in Resource Management?

We have already tried many things but so far without success.
What should the resource management look like if we want to set an interrupt from the GPIO1_66 in the R5F?

Our current interrupt routing is this:

/* Main GPIO Interrupt Router */
		{
			.start_resource = 0,
			.num_resource = 12,
			.type = RESASG_UTYPE (AM64X_DEV_MAIN_GPIOMUX_INTROUTER0,
					RESASG_SUBTYPE_IR_OUTPUT),
			.host_id = HOST_ID_A53_2,
		},
		{
			.start_resource = 0,
			.num_resource = 12,
			.type = RESASG_UTYPE (AM64X_DEV_MAIN_GPIOMUX_INTROUTER0,
					RESASG_SUBTYPE_IR_OUTPUT),
			.host_id = HOST_ID_MAIN_0_R5_1,
		},
		{
			.start_resource = 12,
			.num_resource = 2,
			.type = RESASG_UTYPE (AM64X_DEV_MAIN_GPIOMUX_INTROUTER0,
					RESASG_SUBTYPE_IR_OUTPUT),
			.host_id = HOST_ID_MAIN_1_R5_1,
		},
		{
			.start_resource = 14,
			.num_resource = 2,
			.type = RESASG_UTYPE (AM64X_DEV_MAIN_GPIOMUX_INTROUTER0,
					RESASG_SUBTYPE_IR_OUTPUT),
			.host_id = HOST_ID_MAIN_1_R5_3,
		},

But it does not work.

Regards,

Artur

Hi Artur,

I will look into this and get back to you.

Thanks,

Anshu

Any news on this?

Regards,

Artur

Hi Artur,

I haven't had a chance to look at this due to a high priority customer escalation. I'll send it back to the MCU+ team to see if they can comment.

Thank you for your patience,

Anshu

Hi Anshu,

I got it already working. 

But unfortunally it it not possible to configure the interrupts via sysconfig, because sysconfig only allows to select router 7 as max. But I needed to use 8 or 9, therefore I had to implement the generated code for myself.

Why isn't it possible to select router 0-15 in sysconfig?

Regards

Artur