Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1245388

Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt controller.

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

Majun,

On Tue, 13 Oct 2015, majun (F) wrote:
> 在 2015/10/12 0:45, Thomas Gleixner 写道:
> > So now in the mbigen case this looks like this:
> > 
> >     [MSI-BUS] ----- [MBIGEN]<-------------------[Device interrupt]
> > 
> > Again, you have a 'wire' from the device to the MSI unit (MBIGEN) and
> > we do not care about that 'wire' either. What we care about is how we
> > find the MSI (mbigen) configuration registers for a particular
> > device. So we need a DT/ACPI entry which describes those configuration
> > registers and whatever supplementary information is required. That
> > will make the mbigen driver extremly simple.
> > 
> 
> According to your suggestions, I tried to make the hardware structure likes below:
> 
> device(8250 uart) -> mbigne -> ITS-pMSI --> ITS --> GIC

I'm not sure whether mbigen should be connected to ITS-pMSI (I assume
you mean ITS-PCI-MSI).

mbigen is a seperate MSI domain, so it should connect to ITS, but I
leave that to Marc.
 
> And  8250 uart dts node is:
> 
>  8250_uart {
> 	compatible = "xxx";
> 	msi-parent = < &mbigen>;
> 	config_addr = <xxxxx> ; /* configuration register */
> 	interrupts = <x>;
> 	interrupt-parent = ?
> }
> 
> My question is what's the interrupt-parent should be?

There is no interrupt parent for 8250_uart. Why would you want that?
I'm really not a DT expert, but I think you want something like this:

  8250_uart {
 	compatible = "xxx";
 	msi-parent = < &mbigen_node5>;
 	interrupt-map = <&mbigen5 0>;
  };

and then have

  mbigen_node5 {
  	...
	reg = <....>;
  };

So the other devices which are connected to mbigen_node5 have the same
msi-parent. But then again, please discuss that with Marc and the DT
wizards.

Thanks,

	tglx

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Thomas Gleixner <tglx@linutronix.de> - 2015-10-09 15:50 +0200
  Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. "majun (F)" <majun258@huawei.com> - 2015-10-10 11:10 +0200
    Re: [PATCH v5 1/3] initialize each mbigen device node as a  interrupt controller. Marc Zyngier <marc.zyngier@arm.com> - 2015-10-10 12:20 +0200
      Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Thomas Gleixner <tglx@linutronix.de> - 2015-10-11 12:00 +0200
        Re: [PATCH v5 1/3] initialize each mbigen device node as a  interrupt controller. Marc Zyngier <marc.zyngier@arm.com> - 2015-10-11 13:10 +0200
          Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Thomas Gleixner <tglx@linutronix.de> - 2015-10-11 18:50 +0200
            Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. "majun (F)" <majun258@huawei.com> - 2015-10-13 08:40 +0200
              Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Thomas Gleixner <tglx@linutronix.de> - 2015-10-13 09:00 +0200
                Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. "majun (F)" <majun258@huawei.com> - 2015-10-14 10:30 +0200
                Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Thomas Gleixner <tglx@linutronix.de> - 2015-10-14 10:30 +0200
                Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. "majun (F)" <majun258@huawei.com> - 2015-10-14 11:10 +0200
            Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Marc Zyngier <marc.zyngier@arm.com> - 2015-10-14 11:00 +0200
              Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Thomas Gleixner <tglx@linutronix.de> - 2015-10-14 11:20 +0200
                Re: [PATCH v5 1/3] initialize each mbigen device node as a interrupt  controller. Marc Zyngier <marc.zyngier@arm.com> - 2015-10-14 11:50 +0200

csiph-web