From nobody Fri Feb 13 01:40:14 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 AD18E140399; Tue, 4 Jun 2024 07:42:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717486963; cv=none; b=KHLvziMs2EnEU8yD1reYSuA/CCCFhLK2TVe7TveVqs13f9pjth5uCd5Eak9nuO6KiCnleIGXcy1HVYOzS1GhfXA3/1PciYcso05E7K7LEYPBE1n7n/O4HO7mIf9YxqnRhFR1kmJPwFaB0F1H/svGXwCxQt9Tyxj5v3pUqP5PSm4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717486963; c=relaxed/simple; bh=SN5J7RI6JSHiLzdRYcIH1OJvtJI+2IfG/BlH4wBvC/A=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=gVyPXHFxIyQ+ytTvichNRDXue1smPUKfaUfcNxoJug4xM7V7PeDMQ9VMNyYhuN5JAvcX6URJwevyqHeL0j4E95Lo0w5DJCRtzt1cyqwT4OUW9zkviN5mASNVsi4YP22h8T1HUirk6NaKZacYzHZWpQht1KWxBp2UccxcIRIcrHU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YkpsAyIm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YkpsAyIm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 990D2C32782; Tue, 4 Jun 2024 07:42:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717486963; bh=SN5J7RI6JSHiLzdRYcIH1OJvtJI+2IfG/BlH4wBvC/A=; h=From:To:Cc:Subject:Date:From; b=YkpsAyIm/8xj6wyJAerwgfsp6uB58wAiiiT8NaZhiv9RDKz8VXNXynIvY5lFjy1bB WY8W/C+CpCvv9gEuOIlo+d8t6UvotWwk3sfnkZI5v0RX/lsiPkEwRW8JXstdyXmi2k QZPpEZDqnmFivbuC7VV+Vu7nvIbNUQNBzF0Gvsw9822a4IRvAbOL9S0SVX5akr+QLl QD5yi/IxD7HlFsPHez6oRuDHiARY+cafvsOfX+M9aIe0JEBQdhMxXYNKF8OeocjywJ 8Btpe6CzHj8cRwv6hmvPF9mmO6X73+RfLDfy4qff3S+MQKs36IClQNyCvsDqo85pvY feoJcmFQfawCw== From: Michael Walle To: Tudor Ambarus , Pratyush Yadav , Michael Walle , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Thorsten Scherer , Marek Vasut , Imre Kaloz , Andrew Lunn , Flavio Suligoi Subject: [PATCH] dt-bindings: mtd: spi-nor: deprecate Everspin MRAM devices Date: Tue, 4 Jun 2024 09:42:31 +0200 Message-Id: <20240604074231.1874972-1-mwalle@kernel.org> X-Mailer: git-send-email 2.39.2 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 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. 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 Acked-by: Tudor Ambarus Reviewed-by: Miquel Raynal --- 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. 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. 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(-) diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Doc= umentation/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|25635e)= |\ (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/eeprom= /at25.yaml. + deprecated: true description: SPI NOR flashes compatible with the JEDEC SFDP standard or which may= be identified with the READ ID opcode (0x9F) do not deserve a specific --=20 2.39.2