LS1046 PPS on GPIO

srogers — Thu, 09 May 2024 20:11:49 GMT

I'm trying to connect a GPS 1PPS signal to a FRWY-LS1046 via a GPIO line.

I've done the following:

Kernel config:

CONFIG_PPS=y CONFIG_PPS_CLIENT_GPIO=m CONFIG_PPS_DEBUG=y

fsl-ls1046a.dtsi:

pps { compatible = "pps-gpio"; gpios = <&gpio3 11 0>; assert-falling-edge; };

The kernel logs show pps1 fails to get setup:

[ 941.608348] genirq: Setting trigger mode 1 for irq 83 failed (mpc8xxx_irq_set_type+0x0/0xf8) [ 941.616823] pps_core: unregistering pps1 [ 941.617053] pps_core: deallocating pps1 [ 941.617063] pps-gpio pps: failed to acquire IRQ 83 [ 941.621915] pps-gpio: probe of pps failed with error -22

Is there a problem with using GPIO3_11 (427) for this? Is it on a GPIO expander or something?

I can read the PPS signal on the GPIO so I know I've got the correct pin.

Re: LS1046 PPS on GPIO

srogers — Fri, 10 May 2024 09:33:04 GMT

Apologies - I had made a mistake - my .dtsi looked like this when it failed:

pps { compatible = "pps-gpio"; gpios = <&gpio3 11 0>; assert-rising-edge; };

This is evidently wrong - for rising edge you remove the assert-falling-edge line.

It looks like pps1 is now registered.

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LS1046 PPS on GPIO

Re: LS1046 PPS on GPIO