[{"id":3675153,"web_url":"http://patchwork.ozlabs.org/comment/3675153/","msgid":"","list_archive_url":null,"date":"2026-04-09T08:14:17","subject":"Re: [RFC PATCH 0/5] gpio: add PMIO support to gpio-mmio","submitter":{"id":92050,"url":"http://patchwork.ozlabs.org/api/people/92050/","name":"Linus Walleij","email":"linusw@kernel.org"},"content":"Hi Jose,\n\nthanks for your proposal!!\n\nI'm very happy to see some traction on this. I add WBG to CC because he\nwrote so many port-mapped drivers that I think he'll be thrilled to make\nuse of this as well.\n\nOn Tue, Apr 7, 2026 at 8:49 PM Jose Javier Rodriguez Barbarin\n wrote:\n\n> This series is an RFC for adding port-mapped I/O (PMIO) support to\n> gpio-mmio.\n(...)\n> In particular, feedback would be appreciated on:\n> - whether extending gpio_generic_chip_config is the right direction;\n\nPointed out on the patch that you can just create a\ngpio_generic_port_chip_config\nor something like that, it's only used at config time (usually locally\nin probe()) resulting in a transient stack allocation anyway.\n\nAlso that makes it easier to see what's going on.\n\n> - whether introducing a common MMIO/PMIO register descriptor is\n> acceptable;\n> - whether PMIO support should instead be implemented differently in\n> gpio-mmio.\n\nThe main feedback I have is to use a union between port and\nMMIO address instead of a struct with both.\n\nIt makes it clear that we only ever use one of them and saves\nsome memory, especially since we use several instances of\nit per generic chip later in the code.\n\nYours,\nLinus Walleij","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=GR5jf201;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; 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Thu, 09 Apr 2026\n 01:14:28 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-gpio@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260407184805.807328-1-dev-josejavier.rodriguez@duagon.com>","In-Reply-To":"<20260407184805.807328-1-dev-josejavier.rodriguez@duagon.com>","From":"Linus Walleij ","Date":"Thu, 9 Apr 2026 10:14:17 +0200","X-Gmail-Original-Message-ID":"\n ","X-Gm-Features":"AQROBzCc5KXo2Xr_pHwF1zlDMYcT8Rpo9yywIK8exDb6sosUOxqjO9mxjrZtVQ8","Message-ID":"\n ","Subject":"Re: [RFC PATCH 0/5] gpio: add PMIO support to gpio-mmio","To":"Jose Javier Rodriguez Barbarin ,\n\tWilliam Breathitt Gray ","Cc":"brgl@kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}},{"id":3675706,"web_url":"http://patchwork.ozlabs.org/comment/3675706/","msgid":"","list_archive_url":null,"date":"2026-04-10T07:44:18","subject":"Re: [RFC PATCH 0/5] gpio: add PMIO support to gpio-mmio","submitter":{"id":92011,"url":"http://patchwork.ozlabs.org/api/people/92011/","name":"Jose Javier Rodriguez Barbarin","email":"dev-josejavier.rodriguez@duagon.com"},"content":"On Thu, Apr 09, 2026 at 10:14:17AM +0200, Linus Walleij wrote:\n> Hi Jose,\n> \n> thanks for your proposal!!\n\nYou are welcome :)\n\n> \n> I'm very happy to see some traction on this. I add WBG to CC because he\n> wrote so many port-mapped drivers that I think he'll be thrilled to make\n> use of this as well.\n\nI was a bit worried about if my approach was correct or not, so I'm really\nglad to hear such positive feedback.\n\n> \n> On Tue, Apr 7, 2026 at 8:49 PM Jose Javier Rodriguez Barbarin\n> wrote:\n> \n> > This series is an RFC for adding port-mapped I/O (PMIO) support to\n> > gpio-mmio.\n> (...)\n> > In particular, feedback would be appreciated on:\n> > - whether extending gpio_generic_chip_config is the right direction;\n> \n> Pointed out on the patch that you can just create a\n> gpio_generic_port_chip_config\n> or something like that, it's only used at config time (usually locally\n> in probe()) resulting in a transient stack allocation anyway.\n> \n> Also that makes it easier to see what's going on.\n\nSeems interesting.\n\nAs you pointed out, creating the new gpio_generic_port_chip_config would\nneed more refactoring to adapt the new structure. I'm OK with that so I'm\nworking on it. I will include those changes on v2.\n\n> \n> > - whether introducing a common MMIO/PMIO register descriptor is\n> > acceptable;\n> > - whether PMIO support should instead be implemented differently in\n> > gpio-mmio.\n> \n> The main feedback I have is to use a union between port and\n> MMIO address instead of a struct with both.\n> \n> It makes it clear that we only ever use one of them and saves\n> some memory, especially since we use several instances of\n> it per generic chip later in the code.\n> \n\nAnnotated. I will include the union on v2.\n\n> Yours,\n> Linus Walleij\n\nThanks for your review and for your comments/suggestions. I really\nappreciate that.\n\nRegards,\n\nJavier R.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=duagon.com header.i=@duagon.com header.a=rsa-sha256\n header.s=selector1 header.b=EvHTSTbZ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-gpio+bounces-34986-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (1024-bit key) header.d=duagon.com header.i=@duagon.com\n header.b=\"EvHTSTbZ\"","smtp.subspace.kernel.org;\n arc=fail smtp.client-ip=40.107.168.88","smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) 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pr=C","X-SEPP-Suspect":"7ffcd419564b4bdc8e31067ff0ba8fed","Date":"Fri, 10 Apr 2026 09:44:18 +0200","From":"Jose Javier Rodriguez Barbarin ","To":"Linus Walleij ","Cc":"William Breathitt Gray , brgl@kernel.org,\n\tlinux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org","Subject":"Re: [RFC PATCH 0/5] gpio: add PMIO support to gpio-mmio","Message-ID":"","References":"<20260407184805.807328-1-dev-josejavier.rodriguez@duagon.com>\n ","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"\n ","X-ClientProxiedBy":"MA3P292CA0055.ESPP292.PROD.OUTLOOK.COM\n (2603:10a6:250:48::13) To ZRAP278MB0525.CHEP278.PROD.OUTLOOK.COM\n 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