From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [GIT PULL] On-demand device probing Date: Mon, 19 Oct 2015 16:29:40 +0100 Message-ID: <1445268580.53393.183.camel@infradead.org> References: <561E1378.6000906@collabora.com> <20151017065750.GA18607@kroah.com> <20151018192931.GY14956@sirena.org.uk> <20151018193757.GA9147@kroah.com> <20151018195330.GB14956@sirena.org.uk> <1445247881.53393.146.camel@infradead.org> <1445258870.53393.173.camel@infradead.org> <20151019145048.GI14956@sirena.org.uk> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-AxdVhL+VWkAHcSb8DC2N" Return-path: In-Reply-To: <20151019145048.GI14956@sirena.org.uk> Sender: linux-clk-owner@vger.kernel.org To: Mark Brown Cc: Rob Herring , Greg Kroah-Hartman , Tomeu Vizoso , Russell King , Michael Turquette , Stephen Boyd , Vinod Koul , Dan Williams , Linus Walleij , Alexandre Courbot , Thierry Reding , David Airlie , Terje =?ISO-8859-1?Q?Bergstr=F6m?= , Stephen Warren , Wolfram Sang , Frank Rowand , Grant Likely , Kishon Vijay Abraham I , Sebastian Reichel , Dmitry Eremin-Solenikov , Liam Girdwood , Felipe Balbi List-Id: linux-gpio@vger.kernel.org --=-AxdVhL+VWkAHcSb8DC2N Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2015-10-19 at 15:50 +0100, Mark Brown wrote: > > But the point I'm making is that we are working towards *fixing* that, > > and *not* using DT-specific code in places where we should be using the > > generic APIs. >=20 > What is the plan for fixing things here? It's not obvious (at least to > me) that we don't want to have the subsystems having knowledge of how > they are bound to a specific firmware which is what you seem to imply > here.=20 I don't know that there *is* a coherent plan here to address it all. Certainly, we *will* need subsystems to have firmware-specific knowledge in some cases. Take GPIO as an example; ACPI *has* a way to describe GPIO, and properties which reference GPIO pins are intended to work through that =E2=80=94 while in DT, properties which reference GPIO pi= ns will have different contents. They'll be compatible at the driver level, in the sense that there's a call to get a given GPIO given the property name, but the subsystems *will* be doing different things behind the scenes. My plan, such as it is, is to go through the leaf-node drivers which almost definitely *should* be firmware-agnostic, and convert those. And then take stock of what we have left, and work out what, if anything, still needs to be done. > It seems like we're going to have to refactor these bits of code when > they get generalised anyway so I'm not sure that the additional cost > here is that big. That's an acceptable answer =E2=80=94 "we're adding legacy code here but we know it's going to be refactored anyway". If that's true, all it takes is a note in the commit comment to that effect. That's different from having not thought about it :) --=20 dwmw2 --=-AxdVhL+VWkAHcSb8DC2N Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG doa5RY7+N4WRusWZDYW/RRWE6i9EL9qV86CVPYqw22UBOUw4/j/HVGCV6TSB8yE5iEwhk/hUuzRr 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