AM625: EXTINTn GIC500 SPI Interrupt

Koji Hirohashi

Intellectual 390 points

Part Number: AM625
Other Parts Discussed in Thread: TPS65219

Tool/software:

I would like to understand interrupt function in AM62x.

According to the following dts, tps65219's interrupt output signal is received EXTINTn:

arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts

The interrupt output is pulled low for fault conditions.

However, interrupts property in tps65219 node is set to <GIC_SPI 224 IRQ_TYPE_LEVEL_HIGH>.

Further mode, according to TRM, gicss0.spi.224 source is usb0.irq.4.

(1) Is EXTINTn signal inverted in the path to GIC500?

(2) Can gicss0.spi.224 get interrupt from EXTINTn?

Best Regards,

Koji

7 months ago

0 Bin Liu 7 months ago

TI__Guru**** 169071 points

Hi Koji,

Koji Hirohashi said:
(1) Is EXTINTn signal inverted in the path to GIC500?

According to the kernel devicetree binding doc interrupt-controller/arm,gic-v3.yaml, GIC can only be configured as edge (1) or level (4) triggered. And include/dt-bindings/interrupt-controller/irq.h defines IRQ_TYPE_LEVEL_HIGH as 4.

Koji Hirohashi said:
(2) Can gicss0.spi.224 get interrupt from EXTINTn?

The GIC interrupt numbers used in devicetree have an offset of 32. So 'GIC_SPI 224' really points to gicss0.spi.256 which is "Glue_ext_intn.out.0" in the TRM.

0 Koji Hirohashi 7 months ago in reply to Bin Liu

Intellectual 390 points

Hi Bin Liu,

I could understood about (2).

Bin Liu said:
GIC can only be configured as edge (1) or level (4) triggered.

So, interrupts property can only select trigger to edge or level, right?

How define the trigger condition which high or low level?

Best Regards,

Koji

0 Bin Liu 7 months ago in reply to Koji Hirohashi

TI__Guru**** 169071 points

Hi Koji,

Most, if not all, interrupts are already configured in the kernel devicetree. What else particular interrupt do you have questions with?

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AM625: EXTINTn GIC500 SPI Interrupt