From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DC07C2D0DF for ; Tue, 31 Dec 2019 09:23:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E9CC20718 for ; Tue, 31 Dec 2019 09:23:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577784184; bh=CRXnGizVpLhEDU5W+Mn1XPTimf2r4lvRUd9OOp3POpE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=BujD1AoUfboRdhNQ7l3bOcjL85aEGFlgV2nvGcXNFvSDtsyirGCHDuXggH8tGtJcN LYl8pTYJaPEXHyMFjASN94fO/u5IUtECz4aRInOUHxF8/dXGCRFF8Rvh5X5hruDSgK CaCLEPET+R9QofrYxzlDhYW4WUj9mfh5/hBf4KzM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726334AbfLaJXA convert rfc822-to-8bit (ORCPT ); Tue, 31 Dec 2019 04:23:00 -0500 Received: from mail-ed1-f68.google.com ([209.85.208.68]:33427 "EHLO mail-ed1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726119AbfLaJW7 (ORCPT ); Tue, 31 Dec 2019 04:22:59 -0500 Received: by mail-ed1-f68.google.com with SMTP id r21so34818172edq.0; Tue, 31 Dec 2019 01:22:58 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=zcMF0DszYjdAAeSzpwgiwYYj0Rmxb5AATwzX117pufo=; b=tp4tCPQqUUtrCUnBKOQ2hDTX5hSvi6k/POqxIqU8innGP4rro8a/dWwaydpd4O9XNS mnLoYBZL+FEl/mV9XqJtWs37/+cc+PaVaRPFFwRqQ66mj38Uhrvf1F3ImtD1N8oO5fH8 TkQEDwbGnknv+AeVr9d+S/tPP8zzZ3wX9yml4nuDFflSbsTGKQjm05Pz8TJj3GzTPQ6J NmzL0QvJCJ7JWVy25EA19RQXp5XfkQtoyl/0op5sW75QKDUW3FYay1eaZRs+n6jhf5b4 iSjN6x1TMno7z1EXAX55WBU3y0QWzlBEMxBkrDsklk6j+YzQuBmU/yGanfGg4fU5I/qI 2HQA== X-Gm-Message-State: APjAAAXnmYGksETNYv4hFNlSnDTR19e/fjZKK0xeP+prHxu5oodin03v C3L5ixW3vh2F8iFDqOVC+Dk= X-Google-Smtp-Source: APXvYqzgzVpvRf+8IP6z3ujB3SZIWKfFAGfLl8aejvQf9p703WelAn4funQmIQW8H6z6pzmhM0Yc6w== X-Received: by 2002:a17:906:1fd5:: with SMTP id e21mr44856105ejt.97.1577784177492; Tue, 31 Dec 2019 01:22:57 -0800 (PST) Received: from pi3 ([194.230.155.138]) by smtp.googlemail.com with ESMTPSA id x15sm5693555edl.48.2019.12.31.01.22.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Dec 2019 01:22:56 -0800 (PST) Date: Tue, 31 Dec 2019 10:22:54 +0100 From: Krzysztof Kozlowski To: Artur =?utf-8?B?xZp3aWdvxYQ=?= Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, dri-devel@lists.freedesktop.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, inki.dae@samsung.com, sw0312.kim@samsung.com, georgi.djakov@linaro.org, leonard.crestez@nxp.com, m.szyprowski@samsung.com, b.zolnierkie@samsung.com Subject: Re: [RFC PATCH v3 4/7] arm: dts: exynos: Add interconnect bindings for Exynos4412 Message-ID: <20191231092254.GA6939@pi3> References: <20191220115653.6487-1-a.swigon@samsung.com> <20191220115653.6487-5-a.swigon@samsung.com> <20191230154405.GC4918@pi3> <2922135223b01126277ef92a53e6b294bc17bb5c.camel@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <2922135223b01126277ef92a53e6b294bc17bb5c.camel@samsung.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Tue, Dec 31, 2019 at 08:18:01AM +0100, Artur Świgoń wrote: > Hi, > > On Mon, 2019-12-30 at 16:44 +0100, Krzysztof Kozlowski wrote: > > On Fri, Dec 20, 2019 at 12:56:50PM +0100, Artur Świgoń wrote: > > > This patch adds the following properties to the Exynos4412 DT: > > > - exynos,interconnect-parent-node: to declare connections between > > > nodes in order to guarantee PM QoS requirements between nodes; > > > - #interconnect-cells: required by the interconnect framework. > > > > > > Note that #interconnect-cells is always zero and node IDs are not > > > hardcoded anywhere. > > > > > > Signed-off-by: Artur Świgoń > > > --- > > > arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 5 +++++ > > > 1 file changed, 5 insertions(+) > > > > The order of patches is confusing. Patches 4 and 6 are split - do the > > depend on 5? I doubt but... > > Let me elaborate: > > The order of the patches in this series is such that every subsequent > patch adds some functionality (and, of course, applying patches one-by-one > yields a working kernel at every step). Specifically for patches 04--07: > > -- patch 04 adds interconnect _provider_ properties for Exynos4412; > -- patch 05 implements interconnect provider logic (depends on patch 04); > -- patch 06 adds interconnect _consumer_ properties for Exynos4412 mixer; > -- patch 07 implements interconnect consumer logic (depends on patches > 05 & 06); > > My reasoning is that this order allows to e.g., merge the interconnect > provider for exynos-bus and leave the consumers for later (not limited to > the mixer). I hope this makes sense. It is wrong. The driver should not depend on DTS changes because: 1. DTS always go through separate branch and tree, so last patch will have to wait up to 3 cycles (!!!), 2. You break backward compatibility. In certain cases dependency on DTS changes is ok: 1. Cleaning up deprecated properties, 2. Ignoring the backward compatibility for e.g. new platforms. None of these are applicable here. You need to rework it, put DTS changes at the end. This clearly shows that there is no wrong dependency. > > > Adjust the title to match the contents - you are not adding bindings but > > properties to bus nodes. Also the prefix is ARM: (look at recent > > commits). > > OK. > > > > > > > diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi > > > index 4ce3d77a6704..d9d70eacfcaf 100644 > > > --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi > > > +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi > > > @@ -90,6 +90,7 @@ > > > &bus_dmc { > > > exynos,ppmu-device = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>; > > > vdd-supply = <&buck1_reg>; > > > + #interconnect-cells = <0>; > > > > This does not look like property of Odroid but Exynos4412 or Exynos4. > > Strangely enough, this file is where the 'exynos,parent-bus' (aka. 'devfreq') > properties are located (and everything in this RFC concerns devfreq). I cannot find exynos,parent-bus in exynos4412-odroid-common.dtsi. Can you elaborate? Best regards, Krzysztof From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18C09C2D0C2 for ; Tue, 31 Dec 2019 09:23:03 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E2EFB206D9 for ; Tue, 31 Dec 2019 09:23:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org 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Subject: Re: [RFC PATCH v3 4/7] arm: dts: exynos: Add interconnect bindings for Exynos4412 Message-ID: <20191231092254.GA6939@pi3> References: <20191220115653.6487-1-a.swigon@samsung.com> <20191220115653.6487-5-a.swigon@samsung.com> <20191230154405.GC4918@pi3> <2922135223b01126277ef92a53e6b294bc17bb5c.camel@samsung.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2922135223b01126277ef92a53e6b294bc17bb5c.camel@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191231_012259_457105_954E4C83 X-CRM114-Status: GOOD ( 25.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org, b.zolnierkie@samsung.com, sw0312.kim@samsung.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, inki.dae@samsung.com, cw00.choi@samsung.com, myungjoo.ham@samsung.com, leonard.crestez@nxp.com, georgi.djakov@linaro.org, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBEZWMgMzEsIDIwMTkgYXQgMDg6MTg6MDFBTSArMDEwMCwgQXJ0dXIgxZp3aWdvxYQg d3JvdGU6Cj4gSGksCj4gCj4gT24gTW9uLCAyMDE5LTEyLTMwIGF0IDE2OjQ0ICswMTAwLCBLcnp5 c3p0b2YgS296bG93c2tpIHdyb3RlOgo+ID4gT24gRnJpLCBEZWMgMjAsIDIwMTkgYXQgMTI6NTY6 NTBQTSArMDEwMCwgQXJ0dXIgxZp3aWdvxYQgd3JvdGU6Cj4gPiA+IFRoaXMgcGF0Y2ggYWRkcyB0 aGUgZm9sbG93aW5nIHByb3BlcnRpZXMgdG8gdGhlIEV4eW5vczQ0MTIgRFQ6Cj4gPiA+ICAgLSBl eHlub3MsaW50ZXJjb25uZWN0LXBhcmVudC1ub2RlOiB0byBkZWNsYXJlIGNvbm5lY3Rpb25zIGJl dHdlZW4KPiA+ID4gICAgIG5vZGVzIGluIG9yZGVyIHRvIGd1YXJhbnRlZSBQTSBRb1MgcmVxdWly 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<20191220115653.6487-5-a.swigon@samsung.com> <20191230154405.GC4918@pi3> <2922135223b01126277ef92a53e6b294bc17bb5c.camel@samsung.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2922135223b01126277ef92a53e6b294bc17bb5c.camel@samsung.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-pm@vger.kernel.org, b.zolnierkie@samsung.com, sw0312.kim@samsung.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, leonard.crestez@nxp.com, georgi.djakov@linaro.org, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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