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 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2CDC8C46CA2 for ; Tue, 19 Dec 2023 08:18:37 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 4DB9E844; Tue, 19 Dec 2023 09:18:25 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 4DB9E844 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1702973915; bh=JLgvN4ZNXcq5ZrMWW9oBzOnbtgZO3mKJjfEZctSO0Nw=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; 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Tue, 19 Dec 2023 08:12:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1702973546; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VQdUFyLeNJUwSBurp25+RwofnZarRLxRivzumNAHgLw=; b=RD2CkaEn/GG9QxTYaa0dWcy6UlNPS5YXoBiXAWMwaFltIhdneTFchqmrllZwjquGRNKBVa RXLuk1LY9NtnuMY1sO0q+3L2JgQlQ09b5tLMWEt4p+CEtsIfVeVzh2hxDWq3QaW14DcVua G3RM5wdEOZp7SLHR8Ii0LoF3LlEFi83qaccyzXfivV8ed0QDu9QeeAEGNjHl6GYFM3EAV4 /+AjQM0KUdsxQYFB31hCcqXvoJxXbCB8PO2C7Oh5Y9lcaN40/ZoI8EQCTt1zbeaWhkB420 QyYheZGGYiPCpEW7xplaotEH62ULXemTci1tXDqN5+q+R078QgB5ux51ARZ/0g== Date: Tue, 19 Dec 2023 09:12:21 +0100 From: Miquel Raynal To: Richard Weinberger Cc: Amit Kumar Mahapatra , Mark Brown , Tudor Ambarus , pratyush , Vignesh Raghavendra , sbinding@opensource.cirrus.com, Lee Jones , james schulman , david rhodes , rf@opensource.cirrus.com, Jaroslav Kysela , tiwai@suse.com, linux-spi , linux-kernel , Michael Walle , linux-mtd , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , michal simek , linux-arm-kernel , alsa-devel , patches@opensource.cirrus.com, linux-sound@vger.kernel.org, git@amd.com, amitrkcian2002@gmail.com Subject: Re: [PATCH v11 00/10] spi: Add support for stacked/parallel memories Message-ID: <20231219091221.30b1f167@xps-13> In-Reply-To: <1953466568.133535.1702937420979.JavaMail.zimbra@nod.at> References: <20231125092137.2948-1-amit.kumar-mahapatra@amd.com> <1953466568.133535.1702937420979.JavaMail.zimbra@nod.at> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-GND-Sasl: miquel.raynal@bootlin.com Message-ID-Hash: SYY3GCDYRDSEQVHO4DBBPIUV742K26LS X-Message-ID-Hash: SYY3GCDYRDSEQVHO4DBBPIUV742K26LS X-MailFrom: miquel.raynal@bootlin.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Hi Richard, richard@nod.at wrote on Mon, 18 Dec 2023 23:10:20 +0100 (CET): > ----- Urspr=C3=BCngliche Mail ----- > > Von: "Amit Kumar Mahapatra" =20 >=20 > > This patch series updated the spi-nor, spi core and the AMD-Xilinx GQSPI > > driver to add stacked and parallel memories support. =20 >=20 > I wish the series had a real cover letter which explains the big picture > in more detail. >=20 > What I didn't really get so far, is it really necessary to support multip= le > chip selects within a single mtd? > You changes introduce hard to maintain changes into the spi-nor/mtd core = code > which alert me. > Why can't we have one mtd for each cs and, if needed, combine them later? > We have drivers such as mtdconcat for reasons. The Xilinx SPI controller is a bit convoluted, there are two ways to address the bits in a memory: * Either your extend the memory range with the second chip "on top" of the first (which would typically be a mtd-concat use case) * Or you use the two chips in parallel and you store the even bits in one device (let's say cs0) and the odd bits in the other (cs1). Extending mtd-concat for this might be another solution, I don't know how feasible it would be. Maybe these bindings will help understanding the logic: e2edd1b64f1c ("spi: dt-bindings: Describe stacked/parallel memories modes") eba5368503b4 ("spi: dt-bindings: Add an example with two stacked flashes") However I agree the changes will likely be hard to maintain given the complexity brought with such a different controller. Thanks, Miqu=C3=A8l 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id AD76DC41535 for ; Tue, 19 Dec 2023 08:12:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tzHjNErQaLcrAOFMEDkY2g3Gpn4TCY15MnP00MWOfM4=; b=eVFnD9q52qD6uD zflHs1nJNjzEZ2V004IutUoa6YSniL74ey6N/X1LiGujA4gE4sA4k2omHiCLz8oY7JjXIO+LTWxe/ UmgHiaylBAyyJv8MYkFLObnA4UvOVAqa52UrXdlLNyl6w5SlLQv+NytyK96HJL/fEU89QzrvxMrWm jiQd1Qo7mj0MhJWXeRJUoY9G5ClXniYd8WwmKqwG3D5prI7EmgKN+YH91xNN2e00a7DDWGki9MawE I8dq8NegEq6a6WTAQ3zTkTS2MEGtJrBfXllEdw0auiG5sfWVpUGSFegRHWRs8nSKRmsCF2icQDpij MqbFYqT/mjPRp8uNbdrw==; 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Tue, 19 Dec 2023 08:12:34 +0000 Received: from relay1-d.mail.gandi.net ([2001:4b98:dc4:8::221]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rFVDL-00DGNg-1H; Tue, 19 Dec 2023 08:12:32 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id BDF98240012; Tue, 19 Dec 2023 08:12:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1702973546; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VQdUFyLeNJUwSBurp25+RwofnZarRLxRivzumNAHgLw=; b=RD2CkaEn/GG9QxTYaa0dWcy6UlNPS5YXoBiXAWMwaFltIhdneTFchqmrllZwjquGRNKBVa RXLuk1LY9NtnuMY1sO0q+3L2JgQlQ09b5tLMWEt4p+CEtsIfVeVzh2hxDWq3QaW14DcVua G3RM5wdEOZp7SLHR8Ii0LoF3LlEFi83qaccyzXfivV8ed0QDu9QeeAEGNjHl6GYFM3EAV4 /+AjQM0KUdsxQYFB31hCcqXvoJxXbCB8PO2C7Oh5Y9lcaN40/ZoI8EQCTt1zbeaWhkB420 QyYheZGGYiPCpEW7xplaotEH62ULXemTci1tXDqN5+q+R078QgB5ux51ARZ/0g== Date: Tue, 19 Dec 2023 09:12:21 +0100 From: Miquel Raynal To: Richard Weinberger Subject: Re: [PATCH v11 00/10] spi: Add support for stacked/parallel memories Message-ID: <20231219091221.30b1f167@xps-13> In-Reply-To: <1953466568.133535.1702937420979.JavaMail.zimbra@nod.at> References: <20231125092137.2948-1-amit.kumar-mahapatra@amd.com> <1953466568.133535.1702937420979.JavaMail.zimbra@nod.at> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-GND-Sasl: miquel.raynal@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231219_001231_725361_7FA9A60D X-CRM114-Status: GOOD ( 17.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alsa-devel , Vignesh Raghavendra , Alexandre Belloni , Claudiu Beznea , linux-mtd , git@amd.com, sbinding@opensource.cirrus.com, Lee Jones , Tudor Ambarus , amitrkcian2002@gmail.com, Amit Kumar Mahapatra , linux-sound@vger.kernel.org, james schulman , rf@opensource.cirrus.com, Mark Brown , tiwai@suse.com, Jaroslav Kysela , michal simek , linux-arm-kernel , patches@opensource.cirrus.com, linux-kernel , linux-spi , Michael Walle , david rhodes , pratyush 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 SGkgUmljaGFyZCwKCnJpY2hhcmRAbm9kLmF0IHdyb3RlIG9uIE1vbiwgMTggRGVjIDIwMjMgMjM6 MTA6MjAgKzAxMDAgKENFVCk6Cgo+IC0tLS0tIFVyc3Byw7xuZ2xpY2hlIE1haWwgLS0tLS0KPiA+ IFZvbjogIkFtaXQgS3VtYXIgTWFoYXBhdHJhIiA8YW1pdC5rdW1hci1tYWhhcGF0cmFAYW1kLmNv bT4gIAo+IAo+ID4gVGhpcyBwYXRjaCBzZXJpZXMgdXBkYXRlZCB0aGUgc3BpLW5vciwgc3BpIGNv cmUgYW5kIHRoZSBBTUQtWGlsaW54IEdRU1BJCj4gPiBkcml2ZXIgdG8gYWRkIHN0YWNrZWQgYW5k IHBhcmFsbGVsIG1lbW9yaWVzIHN1cHBvcnQuICAKPiAKPiBJIHdpc2ggdGhlIHNlcmllcyBoYWQg YSByZWFsIGNvdmVyIGxldHRlciB3aGljaCBleHBsYWlucyB0aGUgYmlnIHBpY3R1cmUKPiBpbiBt b3JlIGRldGFpbC4KPiAKPiBXaGF0IEkgZGlkbid0IHJlYWxseSBnZXQgc28gZmFyLCBpcyBpdCBy ZWFsbHkgbmVjZXNzYXJ5IHRvIHN1cHBvcnQgbXVsdGlwbGUKPiBjaGlwIHNlbGVjdHMgd2l0aGlu IGEgc2luZ2xlIG10ZD8KPiBZb3UgY2hhbmdlcyBpbnRyb2R1Y2UgaGFyZCB0byBtYWludGFpbiBj aGFuZ2VzIGludG8gdGhlIHNwaS1ub3IvbXRkIGNvcmUgY29kZQo+IHdoaWNoIGFsZXJ0IG1lLgo+ IFdoeSBjYW4ndCB3ZSBoYXZlIG9uZSBtdGQgZm9yIGVhY2ggY3MgYW5kLCBpZiBuZWVkZWQsIGNv bWJpbmUgdGhlbSBsYXRlcj8KPiBXZSBoYXZlIGRyaXZlcnMgc3VjaCBhcyBtdGRjb25jYXQgZm9y IHJlYXNvbnMuCgpUaGUgWGlsaW54IFNQSSBjb250cm9sbGVyIGlzIGEgYml0IGNvbnZvbHV0ZWQs IHRoZXJlIGFyZSB0d28gd2F5cyB0bwphZGRyZXNzIHRoZSBiaXRzIGluIGEgbWVtb3J5OgoqIEVp dGhlciB5b3VyIGV4dGVuZCB0aGUgbWVtb3J5IHJhbmdlIHdpdGggdGhlIHNlY29uZCBjaGlwICJv bgogIHRvcCIgb2YgdGhlIGZpcnN0ICh3aGljaCB3b3VsZCB0eXBpY2FsbHkgYmUgYSBtdGQtY29u Y2F0IHVzZSBjYXNlKQoqIE9yIHlvdSB1c2UgdGhlIHR3byBjaGlwcyBpbiBwYXJhbGxlbCBhbmQg eW91IHN0b3JlIHRoZSBldmVuIGJpdHMKICBpbiBvbmUgZGV2aWNlIChsZXQncyBzYXkgY3MwKSBh bmQgdGhlIG9kZCBiaXRzIGluIHRoZSBvdGhlciAoY3MxKS4KICBFeHRlbmRpbmcgbXRkLWNvbmNh dCBmb3IgdGhpcyBtaWdodCBiZSBhbm90aGVyIHNvbHV0aW9uLCBJIGRvbid0IGtub3cKICBob3cg ZmVhc2libGUgaXQgd291bGQgYmUuCgpNYXliZSB0aGVzZSBiaW5kaW5ncyB3aWxsIGhlbHAgdW5k ZXJzdGFuZGluZyB0aGUgbG9naWM6CmUyZWRkMWI2NGYxYyAoInNwaTogZHQtYmluZGluZ3M6IERl c2NyaWJlIHN0YWNrZWQvcGFyYWxsZWwgbWVtb3JpZXMgbW9kZXMiKQplYmE1MzY4NTAzYjQgKCJz cGk6IGR0LWJpbmRpbmdzOiBBZGQgYW4gZXhhbXBsZSB3aXRoIHR3byBzdGFja2VkIGZsYXNoZXMi KQoKSG93ZXZlciBJIGFncmVlIHRoZSBjaGFuZ2VzIHdpbGwgbGlrZWx5IGJlIGhhcmQgdG8gbWFp bnRhaW4gZ2l2ZW4gdGhlCmNvbXBsZXhpdHkgYnJvdWdodCB3aXRoIHN1Y2ggYSBkaWZmZXJlbnQg Y29udHJvbGxlci4KClRoYW5rcywKTWlxdcOobAoKX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgt YXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3Jn L21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=