[PATCH V2 2/3] dmaengine: bcm2835: use platform_get_irq_byname

Martin Sperl kernel at martin.sperl.org
Wed Apr 20 04:06:15 PDT 2016

On 20.04.2016 08:51, Geert Uytterhoeven wrote:
> On Mon, Apr 11, 2016 at 3:29 PM,  <kernel at martin.sperl.org> wrote:
>> From: Martin Sperl <kernel at martin.sperl.org>
>> Use platform_get_irq_byname to allow for correct mapping of
>> interrupts to dma channels.
>> The currently implemented device tree is unfortunately
>> implemented with the wrong assumption, that each dma-channel
>> has its own dma channel, but dma-irq 11 is handling
>> dma-channel 11-14 and dma-irq 12 is actually a "catch all"
>> interrupt.
>> So here we use the byname variant and require that interrupts
>> are explicitly named via the interrupts-name property in the
> interrupt-names

Vinod has just merged this patch - do you want me to submit another
to correct those?

> You're not explicitly looking for "dma-shared-all" for that?
> You might as well just declare a single unnamed interrupt in the bindings.

dma-shared-all is unfortunately an interrupt-line that triggers
for interrupt-channels 0-15 and that includes the dma channels
that are owned by the firmware.

It is there mostly to document the interrupt-line (which is there in the 
existing device tree files - it is not used.


More information about the linux-rpi-kernel mailing list