[OpenWrt-Devel] [PATCH 4/4] ARM: dts: add PCI to the Gemini DTSI

[Hans Ulli Kroll]

Hi Linus,

On Sun, 5 Feb 2017, Linus Walleij wrote:

> On Sun, Feb 5, 2017 at 11:03 AM, Hans Ulli Kroll
> <ulli.kroll at googlemail.com> wrote:
> 
> > We need to the remove hwirq 26-28 from DT.
> > First one will print this warning while boot.
> >
> > irq: type mismatch, failed to map hwirq-26 for /soc/interrupt-controller at 48000000!
> (...)
> > -                       interrupts = <8 IRQ_TYPE_LEVEL_HIGH>, /* PCI A */
> > -                                       <26 IRQ_TYPE_LEVEL_HIGH>, /* PCI B */
> > -                                       <27 IRQ_TYPE_LEVEL_HIGH>, /* PCI C */
> > -                                       <28 IRQ_TYPE_LEVEL_HIGH>; /* PCI D */
> > +                       interrupts = <8 IRQ_TYPE_LEVEL_HIGH>; /* chained irq PCI A-D */
> 
> Sure I can remove them ... just found them in the irqs.h file and thought it
> made sense to add them. I'll just cut them.
> 
> Since there is actually an internal IRQ controller in the host controller
> cascading the four PCI child IRQs that we model as an irqchip, I don't
> really see why they have these "PCI B-D" IRQs... anyone has a guess?

I think they used some other IP vendor.

from my IB 4220 sources.

#define IRQ_PCI_INTA				       PCI_IRQ_OFFSET + 0
#ifndef CONFIG_DUAL_PCI
#define IRQ_PCI_INTB				       PCI_IRQ_OFFSET + 1
#define IRQ_PCI_INTC				       PCI_IRQ_OFFSET + 2
#define IRQ_PCI_INTD				       PCI_IRQ_OFFSET + 3
#else
#define IRQ_PCI_INTB				       27
#define IRQ_PCI_INTC				       28
#define IRQ_PCI_INTD				       29
#endif

CONFIG_DUAL_PCI is never used
IRQ_PCIB - IRQ_PCID or IRQ_PCI_INTB - IRQ_PCI_INTD are also never used.

You can download my original NAS 4220 here
http://ulli-kroll.de/gemini/kernel.tgz

Greetings
Hans Ulli Kroll
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