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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 10/11/2021 14:58, Geert Uytterhoeven wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Hi Conor, > > On Wed, Nov 10, 2021 at 3:20 PM wrote: >> On 09/11/2021 09:04, Geert Uytterhoeven wrote: >>> On Mon, Nov 8, 2021 at 4:07 PM wrote: >>>> From: Conor Dooley >>>> >>>> +&gpio2 { >>>> + interrupts = >>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT >>>> + PLIC_INT_GPIO2_NON_DIRECT>; >>> >>> Why override interrupts in the board .dts file? >>> Doesn't this belong in the SoC .dtsi file? >> The interrupt setup for the gpio isnt fixed, there is an option to >> either connect the individual gpio interrupts to the plic *or* they can >> be connected to a per gpio controller common interrupt, and it is up to >> the driver to read a register to determine which interrupt triggered the >> common/NON_DIRECT interrupt. This decision is made by a write to a >> system register in application code, which to us didn't seem like it >> belonged in the soc .dtsi. > > So it is software policy? Then it doesn't belong in the board DTS either. The write (if was to be done) would be done by the bootloader, based on the bitstream written to the FPGA, before even u-boot is started. By application I meant the bootloader (or some other bare metal application), not a program running in userspace in case that's what you interpreted. Am I incorrect in thinking that if it is set up by the bootloader that Linux can take it for granted? > >> Using the common interrupt for GPIO2 is the default on the >> polarfire-soc, there are only 38 per gpio line interrupts available of >> which 14 are connected to gpio0 and 24 to gpio1. > > > Exactly. > > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like that. > -- Linus Torvalds > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv