AM437x GPMC EDMA configuration in device tree

Unknown Unknown86

Other Parts Discussed in Thread: AM4376, AM4372

I want to use EDMA external event 0 with GPMC. I don't know how to map xdma_event_intr0 to GPMC in Device Tree.

I read "Documentation/devicetree/bindings/dma/ti-edma.txt" but it doesn't explain how to use an event.

And also how map EDMA destination? I want to read from GPMC with external event and place it a specific memory location.

Can anyone show me an example of GPMC configuration in device tree with EDMA external event and memory map?

I'm using AM4376.

Regards

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

What processor is this?

0 Unknown Unknown86 over 8 years ago in reply to Biser Gatchev-XID

Prodigy 170 points

Sorry, I forgot to mention that I'm using AM437x family.

0 Biser Gatchev-XID over 8 years ago in reply to Unknown Unknown86

TI__Guru**** 393215 points

Thanks. The software team have been notified and will respond here.

0 Unknown Unknown86 over 8 years ago in reply to Biser Gatchev-XID

Prodigy 170 points

Hi

Any news from software team?
Regards

0 Yordan Kovachev over 8 years ago in reply to Unknown Unknown86

TI__Guru**** 161600 points

Hi,

Can you try the following approaches:
1. mux the xdma_event_intr0 to gpio0_19, then in the gpmc node add:
interrupt-parent = <&gpio0>;
interrupts = <19 0>;
interrupts-extended = <&gpio0 19 GPIO_ACTIVE_HIGH>,

and as a separate dts node add:
&gpio0 {
status = "okay";
};

NOTE: you should make sure that gpio0 is not needed for another dts node. If gpio is used for another funciton the above approach is not applicable.

2. Set the xdma_event_intr0 to mux mode 0 (xdma_event_intr0 ), and try mapping the crossbarr irq number to the gpio device tree node in am4372.dtsi:
interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>; /*see Table 10-24. Crossbar Mapped (continued) in am437x TRM*/

Best Regards,
Yordan

0 Unknown Unknown86 over 8 years ago in reply to Yordan Kovachev

Prodigy 170 points

Thanks, I'll try it.

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AM437x GPMC EDMA configuration in device tree