How to set the interrupt period of the epit.

[ravis5354]

Hi All. I am trying to use EPIT. I have made some changes on below file.

imx6sx.dtsi -  >  

epit1: epit@020d0000 {

compatible = "fsl,imx6sx-epit", "fsl,imx31-epit";

reg = <0x020d0000 0x4000>; 

interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6SX_CLK_EPIT1>;

clock-names = "ipg", "per";

status = "okay";

};

epit2: epit@020d4000 {

compatible = "fsl,imx6sx-epit", "fsl,imx31-epit";

reg = <0x020d4000 0x4000>; 

interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6SX_CLK_EPIT2>;

clock-names = "ipg", "per";

status = "okay";

};

2- Please find the attached simple epit module.

3 - When I am inserting the module getting below error

" EPIT1 base address: c0dc0000
genirq: Flags mismatch irq 56. 00000004 (EPIT1) vs. 00000004 (sdma)
EPIT1 request_irq return -16
EPIT1 : request_irq() failure! ""

Can you please help me how to resolve this error.

Thanks in advance.

[ceggers]

I assume your DTS changes are wrong. The "clock" property has one element whilst the "clock-names" property has two elements.

The interrupt number (56/57) seem to be correct (reference manual numbers minus 32). Please check the interrupt number of the SDMA in your device tree.

regards,
Christian

[ravis5354]

I made changes in below dtsi

imx6sx.dtsi -  >  

epit1: epit@020d0000 {

compatible = "fsl,imx6sx-epit", "fsl,imx31-epit";

reg = <0x020d0000 0x4000>; 

interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6SX_CLK_EPIT1>;

clock-names = "ipg", "per";

status = "okay";

};

epit2: epit@020d4000 {

compatible = "fsl,imx6sx-epit", "fsl,imx31-epit";

reg = <0x020d4000 0x4000>; 

interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6SX_CLK_EPIT2>;

clock-names = "ipg", "per";

status = "okay";

};

2. I am using The interrupt number (56/57) seem to be correct (reference manual numbers minus 32).

I am using 24 for EPIT and 25 for EPIT in request irq but after inserting the kernel module getting below interrupts.

               
root@GW-1000-NWE-1011945187000000 ~# cat /proc/interrupts
CPU0
16: 19241 GPC 55 Level i.MX Timer Tick
17: 0 GPC 94 Level arm-pmu
21: 0 GPC 20 Level caam-snvs
22: 416 GPC 26 Level 2020000.serial

24: 0 GPC 50 Level EPIT.1
25: 0 GPC 83 Level EPIT.2
43: 0 GPC 80 Level 20bc000.wdog
44: 0 GPC 49 Level imx_thermal
56: 0 GPC 2 Level sdma

  ->  In dtsi 50 is assign to asrc: asrc@02034000 and 83 is assign to pwm1: pwm@02080000 

but for EPIT is have 56 and 57 in dtsi and sdma is 2 

Can you please check it and share us correct dtsi configuration for imx6 solo x.

Thank you so much in advance.

[ceggers]

I had a short look into your driver code. It seems that you have hard coded the I/O adresses and interrupt number. So there is no value putting this information into the device tree as you driver doesn't use it.

regards,
Christian

[ravis5354]

Okay I got it your point.

Can you please provide me sample code or how to configure the dtsi.

How to use the I/O adresses and interrupt number. please guide me

Best regards

Ravi

[ravis5354]

Hi ceggers

As per your concern The "clock" property has one element whilst the "clock-names" property has two e...

I made same changes in DTSI.

If you have any update how to enable EPIT for imx6 solo x.

Please share me all steps.

Thank you so much for your reply...

[jimmychan]

Which board are you using? Which version of BSP are you using?

[ravis5354]

Hi jimmychan

I am using imx6 solo x with kernel version 4.14.

Thanks to reply

[ravis5354]

Hi jimmychan

Can you please provide me EPIT enable steps and how to use.

Thanks in advance.