From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 73869387578; Wed, 21 Jan 2026 10:39:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768991957; cv=none; b=gTIwdL4hpJSSknwqu+rZXp6651j5HW0LhWPoSD3cpOuh5auW8pHahsA2MZ0N7SQSUfZsTONoWFre9zd5yTTf38zXUEu/uJIb3RYPOoemkPZksovTraFrAfc7X7mtZ32iBO+7v+sWc6Lq/8hxwQSpK6fEpkEOKuE5uXZ15zhNwRc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768991957; c=relaxed/simple; bh=B1iFdTnWdguGhyY0doGStm07ZJThdPbc6qy3UF/3NPM=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=X2AvRd+0YUlrfDbMlUUPD5xT+KzxWVOaxbhUk9nPKnSncBxQL1gRLBA42zvafL7JXsStsyqLxXrwXZAKAyNer9CTiYoZGx7TO6gnMYYrxnMWpF1szvF5FEkPIQE6xTwDCsu6iA9eFwKGQXes6/Qp3hBuHpiF8nP3vJWeNd2Wv4w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=XStGGwYv; arc=none smtp.client-ip=185.246.84.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="XStGGwYv" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id B87481A2993; Wed, 21 Jan 2026 10:39:13 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 87EB16070A; Wed, 21 Jan 2026 10:39:13 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id CC935119B118F; Wed, 21 Jan 2026 11:39:08 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1768991952; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=9C2gF0qyhM8eqSeDpbcnEFwXTWl9i/IdHkoxWX/E6MU=; b=XStGGwYvqLbj+oEWCAhnIceDPZDBnhInkkRrEei5Vs6wNH+zoFm8gMKqPBLdm54b1Ybml/ kOIh85QIQfjwq1h0zSdnpNmIkq8WJ6girq7brMRs0nUlzl2PzNYWnifimrhz82DiN03w7B 0/QRnF5bbcFB6srKUf20e/M95HMK5ZTPCV6+mMwHSowNh/ftw5f4opI1i+DRu5yizL5YLy Ql/9Aj06b1HppB4juBBSJV4bVvHgmH1M/dMvref3bE7Z39p57w5WuBs+5KXCdEL5zRXUbc I0oHPWim/qh2lP9QDt77nbAlRv2QVF81X7mQl/2Fx4k8DxbBplyJeNYbNWXEjQ== From: Miquel Raynal To: Rob Herring Cc: Geert Uytterhoeven , Mark Brown , Krzysztof Kozlowski , Conor Dooley , Geert Uytterhoeven , Magnus Damm , Vaishnav Achath , Thomas Petazzoni , =?utf-8?Q?Herv=C3=A9?= Codina , Wolfram Sang , Vignesh Raghavendra , Santhosh Kumar K , Pratyush Yadav , Pascal Eberhard , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH v2 01/13] spi: dt-bindings: cdns,qspi-nor: Add Renesas RZ/N1D400 to the list In-Reply-To: <20260121024002.GA1845406-robh@kernel.org> (Rob Herring's message of "Tue, 20 Jan 2026 20:40:02 -0600") References: <20260115-schneider-6-19-rc1-qspi-v2-0-7e6a06e1e17b@bootlin.com> <20260115-schneider-6-19-rc1-qspi-v2-1-7e6a06e1e17b@bootlin.com> <87qzrpucae.fsf@bootlin.com> <20260121024002.GA1845406-robh@kernel.org> User-Agent: mu4e 1.12.7; emacs 30.2 Date: Wed, 21 Jan 2026 11:39:08 +0100 Message-ID: <87ms27qmgj.fsf@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Last-TLS-Session-Version: TLSv1.3 >> >> + - items: >> >> + - const: renesas,r9a06g032-qspi >> >> + - const: renesas,rzn1-qspi >> >> + - const: cdns,qspi-nor >> > >> > Doesn't the need for (at least) the CQSPI_NO_INDIRECT_MODE flag mean >> > that this device is not compatible with cdns,qspi-nor, and thus the >> > cdns,qspi-nor fallback must not be used? >>=20 >> I understand the question. It is true that I use driver data to limit >> the number of features the IP can use and this data is associated to the >> Renesas compatible, but I believe all other flavours of this IP would >> also not work without driver data attached to their front >> compatible. None of the SoCs with the Cadence QSPI IP actually would run >> without their own driver data. For me the fallback compatible is >> relevant because it describes the hardware as "this is a derivative of >> the Cadence controller" (and it is clearly the case, and this is also >> mentioned in the reference manual), even though I agree using >> cdns,qspi-nor would definitely not work alone. But again, none of the >> other flavours would anyway. > > Fallbacks should be usable on their own. We've generally moved away from= =20 > having these generic licensed IP compatibles because they always have=20 > per platform changes. Thanks for settling my doubts. I will drop the cdns,qspi-nor then. Miqu=C3=A8l