From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751325AbaJON3D (ORCPT ); Wed, 15 Oct 2014 09:29:03 -0400 Received: from casper.infradead.org ([85.118.1.10]:45653 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751035AbaJON3B (ORCPT ); Wed, 15 Oct 2014 09:29:01 -0400 Message-ID: <1413379736.2762.79.camel@infradead.org> Subject: Re: [PATCH v4 00/13] Add ACPI _DSD and unified device properties support From: David Woodhouse To: Mark Rutland Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Greg Kroah-Hartman , Mika Westerberg , ACPI Devel Maling List , Aaron Lu , "devicetree@vger.kernel.org" , Linus Walleij , Alexandre Courbot , Dmitry Torokhov , Bryan Wu , "grant.likely@linaro.org" , Arnd Bergmann , Darren Hart Date: Wed, 15 Oct 2014 15:28:56 +0200 In-Reply-To: <20141015131551.GC20034@leverpostej> References: <2660541.BycO7TFnA2@vostro.rjw.lan> <1413378271.2762.77.camel@infradead.org> <20141015131551.GC20034@leverpostej> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-R2TeExUGMCvtE436Zde8" X-Mailer: Evolution 3.12.5 (3.12.5-1.fc20) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-R2TeExUGMCvtE436Zde8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2014-10-15 at 14:15 +0100, Mark Rutland wrote: > > @@ -155,7 +168,7 @@ static int of_platform_serial_probe(struct platform= _device *ofdev) > > if (!match) > > return -EINVAL; > > =20 > > - if (of_find_property(ofdev->dev.of_node, "used-by-rtas", NULL)) > > + if (!device_get_property(&ofdev->dev, "used-by-rtas", NULL)) > > return -EBUSY; >=20 > This property should never be present on an ACPI system. RTAS is a > completely different firmware interface on PowerPC. Yes, I sincerely hope we never see used-by-rtas being set on a non-PPC system. But this isn't a new consideration; we were already checking for 'used-by-rtas' on *all* platforms. Perhaps we shouldn't be. But that's almost orthogonal to the issue at hand. > As a general note, I would hope that we're not going to blindly convert > drivers and subsystems over to a common property interface without > considering each property w.r.t. the particular FW interface.=20 > > Each addition to _DSD, especially if through a common accessor needs > _more_ scrutiny than is applied to DT bindings, and we hardly manage to > review DT bindings. The whole point here is to use existing bindings rather than having to reinvent the wheel. Sure, where the existing binding really makes no sense for certain subsystems, we should come up with something different. But in the general case for 'leaf-node' peripherals we would hope that we don't really have to change *anything* other than to make sure the driver is using generic property accessor functions instead of the old OF-specific ones. The point here is *consistency*. We really don't want to make a habit of reinventing different bindings to be exposed through the different firmware types. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-R2TeExUGMCvtE436Zde8 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISxDCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN 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