From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id DD3F5B70F3 for ; Mon, 15 Jun 2009 09:46:56 +1000 (EST) Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [92.198.50.35]) by ozlabs.org (Postfix) with ESMTP id 58B3ADDD04 for ; Mon, 15 Jun 2009 09:46:56 +1000 (EST) Date: Mon, 15 Jun 2009 01:46:43 +0200 From: Wolfram Sang To: "Hans J. Koch" Subject: Re: [PATCH 2/2] uio: add an of_genirq driver Message-ID: <20090614234643.GA17791@pengutronix.de> References: <1244765062-14144-3-git-send-email-w.sang@pengutronix.de> <20090614122136.GD3639@local> <20090614171406.GA1010@pengutronix.de> <20090614183357.GE3639@local> <20090614190533.GA7387@pengutronix.de> <20090614192359.GG3639@local> <4A355155.4020500@grandegger.com> <20090614203444.GH3639@local> <20090614220022.GB24323@pengutronix.de> <20090614230135.GI3639@local> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="0F1p//8PRICkK4MW" In-Reply-To: <20090614230135.GI3639@local> Cc: devicetree-discuss@ozlabs.org, Greg KH , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --0F1p//8PRICkK4MW Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > driver. A user _has_ to setup irq, if there is none, he still has to set > irq=3DUIO_IRQ_NONE. For that matter, 'not specified' and 'not found' is b= oth > the same bad thing. Hmm, what should I do? A typical interrupts-property in a device-tree is specified as: interrupts =3D <&irq_controller_node irq_number irq_sense>; Something like UIO_IRQ_NONE does not fit into this scheme, even more as it = is Linux-specific and device trees need to be OS independant. I'm pretty sure the correct way to state that you don't need an interrupt in the device-tree is to simply not specify the above interrupt property. Well, yes, that means you can't distinguish between 'forgotten' and 'intentionally left out'. I wonder if it is really that bad? If something d= oes not work (=3D one is missing interrupts), the first place to look at is the device tree. If one does not see an interrupt-property, voila, problem solv= ed. (Note that with my latest suggestion, a _wrong_ interrupt is handled the sa= me way as with platform_data. request_irq() should equally fail if the return-value from irq_of_parse_and_map() is simply forwarded.) --=20 Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | --0F1p//8PRICkK4MW Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAko1i+MACgkQD27XaX1/VRtmwgCfU35vNsB6pRMg8ZPEwH5uZbGv yf0AoK9cs8c+cyQpX3TlCqepX2CY7fID =ZRIy -----END PGP SIGNATURE----- --0F1p//8PRICkK4MW--