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, Imre Kaloz , Andrew Lunn , Flavio Suligoi Subject: Re: [PATCH] dt-bindings: mtd: spi-nor: deprecate Everspin MRAM devices Message-ID: <20240604100942.3e663d60@xps-13> In-Reply-To: <20240604074231.1874972-1-mwalle@kernel.org> References: <20240604074231.1874972-1-mwalle@kernel.org> Organization: Bootlin X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; 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-20240604_010952_172499_20522BA1 X-CRM114-Status: GOOD ( 26.73 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org 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header.b=XK+QEUpC; arc=none smtp.client-ip=217.70.183.200 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="XK+QEUpC" Received: by mail.gandi.net (Postfix) with ESMTPSA id AC7FA20008; Tue, 4 Jun 2024 08:09:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1717488588; 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=0vmUIZ3RHApQ8liyK5HZsUjHttqDUp4gSBPYlUPRHpE=; b=XK+QEUpCNM4bUkE+3p8pLAotZEBwCZxnpuPMbgICJo7MVH6kkbG9TEk89TIn75OWFZhczz ppxSR5/WDhJ21ab1qyrUg7vGKMKtw7n2CzrCWsessyX7scaR2vaSptcgwYb6ncbljM2ack E6GZnsbHCKJbeo4zlWPsSWFcaGsBs34VMQr1w4t6teyB+kIthDibNGWB2SraHYNhyUcKRM r+WkjJuw0XCt8L2CykWUNg9gaz7SE73g1etahqOnXRvf3tm4qTPlejjWf/QQWVC3b49Ury mSrIofKPQa0/yno1IL1Mm4uM2i15Pwy+sohj/e3i+o8k2M49zpUk5MLxck0rxw== Date: Tue, 4 Jun 2024 10:09:42 +0200 From: Miquel Raynal To: Michael Walle Cc: Tudor Ambarus , Pratyush Yadav , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Uwe =?UTF-8?B?S2xlaW5lLUvDtm5pZw==?= , Thorsten Scherer , Marek Vasut , Imre Kaloz , Andrew Lunn , Flavio Suligoi Subject: Re: [PATCH] dt-bindings: mtd: spi-nor: deprecate Everspin MRAM devices Message-ID: <20240604100942.3e663d60@xps-13> In-Reply-To: <20240604074231.1874972-1-mwalle@kernel.org> References: <20240604074231.1874972-1-mwalle@kernel.org> Organization: Bootlin X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: devicetree@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-GND-Sasl: miquel.raynal@bootlin.com Hi Michael, mwalle@kernel.org wrote on Tue, 4 Jun 2024 09:42:31 +0200: > These devices are more like an AT25 compatible EEPROM instead of > flashes. Like an EEPROM the user doesn't need to explicitly erase the > memory, nor are there sectors or pages. Thus, instead of the SPI-NOR > (flash) driver, one should instead use the at25 EEPROM driver. >=20 > Signed-off-by: Michael Walle > Cc: Uwe Kleine-K=C3=B6nig > Cc: Thorsten Scherer > Cc: Marek Vasut > Cc: Imre Kaloz > Cc: Andrew Lunn > Cc: Flavio Suligoi > --- > The referenced binding only supports the true AT25 compatible EEPROMs > where you have to specify additional properties like size and page size > or cypress FRAM devices where all the properties are discovered by the > driver. I don't have the actual hardware, therefore I can't work on a > proper driver and binding. But I really want to deprecate the use of > these EEPROM like devices in SPI-NOR. So as a first step, mark the > devices in the DT bindings as deprecated. >=20 > There are three in-tree users of this. I hope I've CCed all the relevant > people. With the switch to the at25 driver also comes a user-space > facing change: there is no more MTD device. Instead there is an "eeprom" > file in /sys now, just like for every other EEPROM. >=20 > Marek already expressed, that the sps1 dts can likely be removed > altogether. I'd like to hear from the other board DTS maintainers if > they seem some problems moving to the EEPROM interface - or maybe that > device isn't used at all anyway. So in the end, we can hopefully move > all the users over to the at25 driver. > --- > Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) >=20 > diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/D= ocumentation/devicetree/bindings/mtd/jedec,spi-nor.yaml > index 6e3afb42926e..2dccb6b049ea 100644 > --- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml > +++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml > @@ -21,7 +21,6 @@ properties: > (m25p(40|80|16|32|64|128)|\ > n25q(32b|064|128a11|128a13|256a|512a|164k)))|\ > atmel,at25df(321a|641|081a)|\ > - everspin,mr25h(10|40|128|256)|\ > (mxicy|macronix),mx25l(4005a|1606e|6405d|8005|12805d|25635= e)|\ > (mxicy|macronix),mx25u(4033|4035)|\ > (spansion,)?s25fl(128s|256s1|512s|008k|064k|164k)|\ > @@ -42,6 +41,14 @@ properties: > - spansion,s25fs512s > - const: jedec,spi-nor > - const: jedec,spi-nor > + > + # Deprecated bindings > + - items: > + - pattern: "^everspin,mr25h(10|40|128|256)$" > + - const: jedec,spi-nor > + description: > + Deprecated binding, use Documentation/devicetree/bindings/eepr= om/at25.yaml. > + deprecated: true > description: > SPI NOR flashes compatible with the JEDEC SFDP standard or which m= ay be > identified with the READ ID opcode (0x9F) do not deserve a specific Makes sense. Reviewed-by: Miquel Raynal Thanks, Miqu=C3=A8l