linux-kernel - Re: [PATCH 4/9] mtd: devices: add AT24 eeprom support

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Message-ID: <07b701a9-7b52-45b7-8dba-1c25d77cbf15@linaro.org>
Date: Mon, 1 Jul 2024 17:14:14 +0100
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Marco Felsch <m.felsch@...gutronix.de>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
 Arnd Bergmann <arnd@...db.de>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Bartosz Golaszewski <brgl@...ev.pl>, Russell King <linux@...linux.org.uk>,
 Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...econstruct.com.au>,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Vladimir Zapolskiy <vz@...ia.com>,
 Andrew Lunn <andrew@...n.ch>, Gregory Clement <gregory.clement@...tlin.com>,
 Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
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 Geert Uytterhoeven <geert+renesas@...der.be>,
 Magnus Damm <magnus.damm@...il.com>, Dinh Nguyen <dinguyen@...nel.org>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Jonathan Neuschäfer <j.neuschaefer@....net>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-aspeed@...ts.ozlabs.org, imx@...ts.linux.dev,
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 loongarch@...ts.linux.dev
Subject: Re: [PATCH 4/9] mtd: devices: add AT24 eeprom support

On 7/1/24 2:53 PM, Marco Felsch wrote:
> EEPROMs can become quite large nowadays (>=64K). Exposing such devices
> as single device isn't always sufficient. There may be partitions which
> require different access permissions. Also write access always need to
> to verify the offset.
> 
> Port the current misc/eeprom/at24.c driver to the MTD framework since
> EEPROMs are memory-technology devices and the framework already supports

I was under the impression that MTD devices are tightly coupled by erase
blocks. But then we see MTD_NO_ERASE, so what are MTD devices after all?

> partitioning. This allow using of-paritions like we do for SPI-NOR
> devices already: