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[67.187.90.124]) by smtp.gmail.com with ESMTPSA id r17sm13537371qta.78.2021.01.26.10.26.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 Jan 2021 10:26:15 -0800 (PST) Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols To: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Masahiro Yamada , Frank Rowand Cc: DTML , Michal Marek , Arnd Bergmann , Linux Kbuild mailing list , Linux Kernel Mailing List , Maxime Ripard , cyril@debamax.com, Geert Uytterhoeven , linux-arm-kernel References: <20210125105757.661240-1-uwe@kleine-koenig.org> <9d9bb0f6-d4f4-b1b9-a4c4-786987578085@kleine-koenig.org> <5e552b57-4e8b-6774-577d-4fa7a8d440ba@gmail.com> From: Frank Rowand Message-ID: <98217e0b-e937-f5b3-fa16-57c79b6ae3f6@gmail.com> Date: Tue, 26 Jan 2021 12:26:14 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <5e552b57-4e8b-6774-577d-4fa7a8d440ba@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Uwe, On 1/26/21 12:03 PM, Frank Rowand wrote: > +frank > > On 1/26/21 1:20 AM, Uwe Kleine-König wrote: >> Hello Masahiro, >> >> On 1/25/21 10:53 PM, Masahiro Yamada wrote: >>> On Mon, Jan 25, 2021 at 8:07 PM Uwe Kleine-König wrote: >>>> >>>> Adding the -@ switch to dtc results in the binary devicetrees containing >>>> a list of symbolic references and their paths. This is necessary to >>>> apply device tree overlays e.g. on Raspberry Pi as described on >>>> https://www.raspberrypi.org/documentation/configuration/device-tree.md. >>>> >>>> Obviously the downside of this change is an increas of the size of the >>>> generated dtbs, for an arm out-of-tree build (multi_v7_defconfig): >>>> >>>>          $ du -s arch/arm/boot/dts* >>>>          101380  arch/arm/boot/dts-pre >>>>          114308  arch/arm/boot/dts-post >>>> >>>> so this is in average an increase of 12.8% in size. >>>> >>>> Signed-off-by: Uwe Kleine-König >>> >>> >>> (CCing DT ML.) >> >> makes sense, thanks. >> >>> https://www.spinics.net/lists/linux-kbuild/msg27904.html >>> >>> See Rob's comment: >>> >>> "We've already rejected doing that. Turning on '-@' can grow the dtb >>> size by a significant amount which could be problematic for some >>> boards." >> >> The patch was created after some conversation on irc which continued >> after I sent the patch. I added the participating parties to Cc:. Unfortunately I have not been on irc recently (now rectified). Do you perchance have a copy of the irc conversation that you can send me? (No need to edit out unrelated messages, a simple cut and paste from the start of the conversation to the end is fine.) -Frank >> >> The (relevant) followups were: >> >> Geert suggested to always generate the symbols and provide a way to >> strip the symbols for installation if and when they are not needed. >> >> Rob said: "I'm less concerned with the size increases, but rather that >> labels go from purely source syntax to an ABI. I'd rather see some >> decision as to which labels are enabled or not." >> >> And then I learned with hints from Rob and Geert that symbols are not >> really necessary for overlays, you just cannot use named labels. But >> using >> >>     target-path = "/soc/i2c@23473245"; >> >> or >> >>     target = <&{/soc/i2c@23473245}>; >> >> instead of >> >>     target = <&i2c1>; >> >> works fine. (And if you need to add a phandle the &{/path/to/node} >> construct should work, too (but I didn't test).) Using labels is a tad nicer, but the problem I wanted to address with my patch now has a known different solution. >> >> Best regards >> Uwe >> >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >> > 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=-7.2 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 7AF9BC433DB for ; Tue, 26 Jan 2021 18:28:24 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 2643B207BC for ; Tue, 26 Jan 2021 18:28:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2643B207BC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=hELVagcxp57yUNeFidFQqVxsu7TkAnXpneCFDRII9WE=; b=Ff9aC0z6rY/LJ7HZZtaKYfnbE 8XGCeB8gLOTAY+OkYAKePFn/6UiglYXGgzznz1my8Ko54kSlhNTzhyf5HzutdrVtKWNfm7l5GQWG8 EOhuCPcL73GdXcObdY18SEdEsLDVjy7MXsZhV0e6S3kZjCzubVBs1gR9ydHMOw01Xj0ZkPwp+ukVC aTmzh8t3Tvn9Tvnnz7Wn8DmgvJUEK3Hxch73+VJXPdlyWJHPQ6Y5fw6rrb+hBGxKteyWoOW0JP0iT gHYJwdO+hWkOvRCrxwQytsh4EN6T/+rYcU0s1XorjHgdN0YKhjSN2b15hWdF8hNfDtMwnt8RPLcg+ Y/C+Gn5SA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4T2j-0007SF-JL; Tue, 26 Jan 2021 18:26:21 +0000 Received: from mail-qk1-x736.google.com ([2607:f8b0:4864:20::736]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4T2g-0007Rw-OU for linux-arm-kernel@lists.infradead.org; Tue, 26 Jan 2021 18:26:19 +0000 Received: by mail-qk1-x736.google.com with SMTP id x81so14024173qkb.0 for ; Tue, 26 Jan 2021 10:26:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=XqI5CT/DnJOGMvQUgx1q4HMcG5oJyLGiChqHaW7eiXs=; b=dbGfmcirlMr7XQ8UCxSwOoJJMLi0Rzh/bjCY+R5ltIEbPKK+t+Ke5/x8JOiE3AsPE9 63nzAWtjztLpnRaT+hf8blfrqdlsnztgZgzAF3sS4ig/ihLsnFWfHgLVMKaDIi1JaKtb jj20eXCopZtvQjniZK1HeGGflqz9Veqt28YsOkp0PiWAF6yTnMZZZbiVIFEHGf1xYjU2 zUIgcqRXfuXoSLf5g2c8IXA3EUXgmbirXtB0AtA2GPAzDRGof7WQLIRafkAXsTTkKrZW qJgQaGGlFq7yIO4+kofGS3Pfd1ta6eTXMuEYuy9jRWt9/ZoUJCIeirvFEcScmwh96Z/h AkuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=XqI5CT/DnJOGMvQUgx1q4HMcG5oJyLGiChqHaW7eiXs=; b=Jv+BbDA8b6aI0GmAMsjUxB9sC24eonDi7QZOeaHvsqm8d1aHGu+RXdXy7uSqoyQzSu 7zwStaO161Bssd5WMeRTlNj3yCDASyk3KdIowR43r+7nXw+4UG8eNALL+IZLtj86xzix F2UWrWAhsyQxhAEhm/gsLn8ph9M455Hqd1rDKOACyosSm+qeTY7x5aZh7FXYYd8GsC7v IKnrGQRetvuQx/gzO2a0VTju38zcBhWJpa2YJ9yKnPtAPlywy+OAn6kC0NM0MlRGTFIq SgFvszzQCPMeU7A2oCVwjOnQyfySiCHArPvYuUBjLE0TF4MPeRF0QZIEEGE822bBf/Jd Jneg== X-Gm-Message-State: AOAM531B6DqPb8VfIJ9JCc1JOm3/L3DmDWXjhVLtMrOF/e+dr1LXXqyo qBhlFIqb38iTQRMvhXCkJyg= X-Google-Smtp-Source: ABdhPJwLdWihoqdNvgl99J+/q85Po4ByMYuL+PNmJr3LhfXQ6Ok+pE9gTWXnRznU0BaxdQDeZ/IF8g== X-Received: by 2002:a37:4815:: with SMTP id v21mr6997141qka.130.1611685576324; Tue, 26 Jan 2021 10:26:16 -0800 (PST) Received: from [192.168.1.49] (c-67-187-90-124.hsd1.ky.comcast.net. [67.187.90.124]) by smtp.gmail.com with ESMTPSA id r17sm13537371qta.78.2021.01.26.10.26.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 Jan 2021 10:26:15 -0800 (PST) Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols To: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Masahiro Yamada , Frank Rowand References: <20210125105757.661240-1-uwe@kleine-koenig.org> <9d9bb0f6-d4f4-b1b9-a4c4-786987578085@kleine-koenig.org> <5e552b57-4e8b-6774-577d-4fa7a8d440ba@gmail.com> From: Frank Rowand Message-ID: <98217e0b-e937-f5b3-fa16-57c79b6ae3f6@gmail.com> Date: Tue, 26 Jan 2021 12:26:14 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <5e552b57-4e8b-6774-577d-4fa7a8d440ba@gmail.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210126_132618_863707_E75B9F36 X-CRM114-Status: GOOD ( 25.30 ) 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: DTML , Michal Marek , Arnd Bergmann , Linux Kbuild mailing list , Linux Kernel Mailing List , Maxime Ripard , cyril@debamax.com, Geert Uytterhoeven , linux-arm-kernel Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SGkgVXdlLAoKT24gMS8yNi8yMSAxMjowMyBQTSwgRnJhbmsgUm93YW5kIHdyb3RlOgo+ICtmcmFu awo+IAo+IE9uIDEvMjYvMjEgMToyMCBBTSwgVXdlIEtsZWluZS1Lw7ZuaWcgd3JvdGU6Cj4+IEhl bGxvIE1hc2FoaXJvLAo+Pgo+PiBPbiAxLzI1LzIxIDEwOjUzIFBNLCBNYXNhaGlybyBZYW1hZGEg d3JvdGU6Cj4+PiBPbiBNb24sIEphbiAyNSwgMjAyMSBhdCA4OjA3IFBNIFV3ZSBLbGVpbmUtS8O2 bmlnIDx1d2VAa2xlaW5lLWtvZW5pZy5vcmc+IHdyb3RlOgo+Pj4+Cj4+Pj4gQWRkaW5nIHRoZSAt QCBzd2l0Y2ggdG8gZHRjIHJlc3VsdHMgaW4gdGhlIGJpbmFyeSBkZXZpY2V0cmVlcyBjb250YWlu aW5nCj4+Pj4gYSBsaXN0IG9mIHN5bWJvbGljIHJlZmVyZW5jZXMgYW5kIHRoZWlyIHBhdGhzLiBU aGlzIGlzIG5lY2Vzc2FyeSB0bwo+Pj4+IGFwcGx5IGRldmljZSB0cmVlIG92ZXJsYXlzIGUuZy4g b24gUmFzcGJlcnJ5IFBpIGFzIGRlc2NyaWJlZCBvbgo+Pj4+IGh0dHBzOi8vd3d3LnJhc3BiZXJy eXBpLm9yZy9kb2N1bWVudGF0aW9uL2NvbmZpZ3VyYXRpb24vZGV2aWNlLXRyZWUubWQuCj4+Pj4K Pj4+PiBPYnZpb3VzbHkgdGhlIGRvd25zaWRlIG9mIHRoaXMgY2hhbmdlIGlzIGFuIGluY3JlYXMg b2YgdGhlIHNpemUgb2YgdGhlCj4+Pj4gZ2VuZXJhdGVkIGR0YnMsIGZvciBhbiBhcm0gb3V0LW9m LXRyZWUgYnVpbGQgKG11bHRpX3Y3X2RlZmNvbmZpZyk6Cj4+Pj4KPj4+PiDCoMKgwqDCoMKgwqDC oMKgICQgZHUgLXMgYXJjaC9hcm0vYm9vdC9kdHMqCj4+Pj4gwqDCoMKgwqDCoMKgwqDCoCAxMDEz ODDCoCBhcmNoL2FybS9ib290L2R0cy1wcmUKPj4+PiDCoMKgwqDCoMKgwqDCoMKgIDExNDMwOMKg IGFyY2gvYXJtL2Jvb3QvZHRzLXBvc3QKPj4+Pgo+Pj4+IHNvIHRoaXMgaXMgaW4gYXZlcmFnZSBh biBpbmNyZWFzZSBvZiAxMi44JSBpbiBzaXplLgo+Pj4+Cj4+Pj4gU2lnbmVkLW9mZi1ieTogVXdl IEtsZWluZS1Lw7ZuaWcgPHV3ZUBrbGVpbmUta29lbmlnLm9yZz4KPj4+Cj4+Pgo+Pj4gKENDaW5n IERUIE1MLikKPj4KPj4gbWFrZXMgc2Vuc2UsIHRoYW5rcy4KPj4KPj4+IGh0dHBzOi8vd3d3LnNw aW5pY3MubmV0L2xpc3RzL2xpbnV4LWtidWlsZC9tc2cyNzkwNC5odG1sCj4+Pgo+Pj4gU2VlIFJv YidzIGNvbW1lbnQ6Cj4+Pgo+Pj4gIldlJ3ZlIGFscmVhZHkgcmVqZWN0ZWQgZG9pbmcgdGhhdC4g VHVybmluZyBvbiAnLUAnIGNhbiBncm93IHRoZSBkdGIKPj4+IHNpemUgYnkgYSBzaWduaWZpY2Fu dCBhbW91bnQgd2hpY2ggY291bGQgYmUgcHJvYmxlbWF0aWMgZm9yIHNvbWUKPj4+IGJvYXJkcy4i Cj4+Cj4+IFRoZSBwYXRjaCB3YXMgY3JlYXRlZCBhZnRlciBzb21lIGNvbnZlcnNhdGlvbiBvbiBp cmMgd2hpY2ggY29udGludWVkCj4+IGFmdGVyIEkgc2VudCB0aGUgcGF0Y2guIEkgYWRkZWQgdGhl IHBhcnRpY2lwYXRpbmcgcGFydGllcyB0byBDYzouCgpVbmZvcnR1bmF0ZWx5IEkgaGF2ZSBub3Qg YmVlbiBvbiBpcmMgcmVjZW50bHkgKG5vdyByZWN0aWZpZWQpLiAgRG8geW91CnBlcmNoYW5jZSBo YXZlIGEgY29weSBvZiB0aGUgaXJjIGNvbnZlcnNhdGlvbiB0aGF0IHlvdSBjYW4gc2VuZCBtZT8K KE5vIG5lZWQgdG8gZWRpdCBvdXQgdW5yZWxhdGVkIG1lc3NhZ2VzLCBhIHNpbXBsZSBjdXQgYW5k IHBhc3RlIGZyb20KdGhlIHN0YXJ0IG9mIHRoZSBjb252ZXJzYXRpb24gdG8gdGhlIGVuZCBpcyBm aW5lLikKCi1GcmFuawoKPj4KPj4gVGhlIChyZWxldmFudCkgZm9sbG93dXBzIHdlcmU6Cj4+Cj4+ IEdlZXJ0IHN1Z2dlc3RlZCB0byBhbHdheXMgZ2VuZXJhdGUgdGhlIHN5bWJvbHMgYW5kIHByb3Zp ZGUgYSB3YXkgdG8KPj4gc3RyaXAgdGhlIHN5bWJvbHMgZm9yIGluc3RhbGxhdGlvbiBpZiBhbmQg d2hlbiB0aGV5IGFyZSBub3QgbmVlZGVkLgo+Pgo+PiBSb2Igc2FpZDogIkknbSBsZXNzIGNvbmNl cm5lZCB3aXRoIHRoZSBzaXplIGluY3JlYXNlcywgYnV0IHJhdGhlciB0aGF0Cj4+IGxhYmVscyBn byBmcm9tIHB1cmVseSBzb3VyY2Ugc3ludGF4IHRvIGFuIEFCSS4gSSdkIHJhdGhlciBzZWUgc29t ZQo+PiBkZWNpc2lvbiBhcyB0byB3aGljaCBsYWJlbHMgYXJlIGVuYWJsZWQgb3Igbm90LiIKPj4K Pj4gQW5kIHRoZW4gSSBsZWFybmVkIHdpdGggaGludHMgZnJvbSBSb2IgYW5kIEdlZXJ0IHRoYXQg c3ltYm9scyBhcmUgbm90Cj4+IHJlYWxseSBuZWNlc3NhcnkgZm9yIG92ZXJsYXlzLCB5b3UganVz dCBjYW5ub3QgdXNlIG5hbWVkIGxhYmVscy4gQnV0Cj4+IHVzaW5nCj4+Cj4+IMKgwqDCoMKgdGFy Z2V0LXBhdGggPSAiL3NvYy9pMmNAMjM0NzMyNDUiOwo+Pgo+PiBvcgo+Pgo+PiDCoMKgwqDCoHRh cmdldCA9IDwmey9zb2MvaTJjQDIzNDczMjQ1fT47Cj4+Cj4+IGluc3RlYWQgb2YKPj4KPj4gwqDC oMKgwqB0YXJnZXQgPSA8JmkyYzE+Owo+Pgo+PiB3b3JrcyBmaW5lLiAoQW5kIGlmIHlvdSBuZWVk IHRvIGFkZCBhIHBoYW5kbGUgdGhlICZ7L3BhdGgvdG8vbm9kZX0KPj4gY29uc3RydWN0IHNob3Vs ZCB3b3JrLCB0b28gKGJ1dCBJIGRpZG4ndCB0ZXN0KS4pIFVzaW5nIGxhYmVscyBpcyBhIHRhZCBu aWNlciwgYnV0IHRoZSBwcm9ibGVtIEkgd2FudGVkIHRvIGFkZHJlc3Mgd2l0aCBteSBwYXRjaCBu b3cgaGFzIGEga25vd24gZGlmZmVyZW50IHNvbHV0aW9uLgo+Pgo+PiBCZXN0IHJlZ2FyZHMKPj4g VXdlCj4+Cj4+Cj4+IF9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fCj4+IGxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0Cj4+IGxpbnV4LWFybS1rZXJuZWxA bGlzdHMuaW5mcmFkZWFkLm9yZwo+PiBodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFu L2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwKPj4KPiAKCgpfX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdAps aW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVh ZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==