ARCH=powerpc: IRQ numbers change mysteriously

ARCH=powerpc: IRQ numbers change mysteriously

[Fredrik Roubert]

Hi!

On my MPC8439 based board, running Linux 2.6.18 with ARCH=powerpc, the
IRQ's for the I2C behave in a for me mysterious way.

In my DTS file, I have the following:


i2c@3000 {
	device_type = "i2c";
	compatible = "fsl-i2c";
	reg = <3000 100>;
	interrupts = <e 8>;
	interrupt-parent = <&/soc8349@ff400000/pic@700>;
	dfsrr;
};

i2c@3100 {
	device_type = "i2c";
	compatible = "fsl-i2c";
	reg = <3000 100>;
	interrupts = <f 8>;
	interrupt-parent = <&/soc8349@ff400000/pic@700>;
	dfsrr;
};


But when I boot the system and cat /proc/interrupts, the output says:


18:         61   IPIC   Level     i2c-mpc
19:          0   IPIC   Level     i2c-mpc


This doesn't make sense to me. Why are the IRQ numbers changed? They are
still adjacent, so it seems to be some logic to the change. Does anyone
know what this is?

Cheers // Fredrik Roubert

-- 
Barco Medical Imaging          |  +32 56 233549
http://www.barco.com/medical/  |  fredrik.roubert@barco.com

RE: ARCH=powerpc: IRQ numbers change mysteriously

[Li Yang-r58472]

The irq number on powerpc ARCH is now a virtual number.  This change was
introduced by Ben's irq mapping change in early 2.6.18-rc.

- Leo

> -----Original Message-----
> From: linuxppc-embedded-bounces+leoli=3Dfreescale.com@ozlabs.org
> [mailto:linuxppc-embedded-bounces+leoli=3Dfreescale.com@ozlabs.org] On
Behalf Of
> Fredrik Roubert
> Sent: Tuesday, October 24, 2006 12:41 AM
> To: linuxppc-embedded@ozlabs.org
> Subject: ARCH=3Dpowerpc: IRQ numbers change mysteriously
>=20
> Hi!
>=20
> On my MPC8439 based board, running Linux 2.6.18 with ARCH=3Dpowerpc, =
the
> IRQ's for the I2C behave in a for me mysterious way.
>=20
> In my DTS file, I have the following:
>=20
>=20
> i2c@3000 {
> 	device_type =3D "i2c";
> 	compatible =3D "fsl-i2c";
> 	reg =3D <3000 100>;
> 	interrupts =3D <e 8>;
> 	interrupt-parent =3D <&/soc8349@ff400000/pic@700>;
> 	dfsrr;
> };
>=20
> i2c@3100 {
> 	device_type =3D "i2c";
> 	compatible =3D "fsl-i2c";
> 	reg =3D <3000 100>;
> 	interrupts =3D <f 8>;
> 	interrupt-parent =3D <&/soc8349@ff400000/pic@700>;
> 	dfsrr;
> };
>=20
>=20
> But when I boot the system and cat /proc/interrupts, the output says:
>=20
>=20
> 18:         61   IPIC   Level     i2c-mpc
> 19:          0   IPIC   Level     i2c-mpc
>=20
>=20
> This doesn't make sense to me. Why are the IRQ numbers changed? They
are
> still adjacent, so it seems to be some logic to the change. Does
anyone
> know what this is?
>=20
> Cheers // Fredrik Roubert
>=20
> --
> Barco Medical Imaging          |  +32 56 233549
> http://www.barco.com/medical/  |  fredrik.roubert@barco.com
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> Linuxppc-embedded mailing list
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