linux-kernel - Re: [PATCH v7 10/12] nvmem: s32g2_siul2: add NVMEM driver for SoC information

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Message-ID: <7902bac4-9f52-443c-995f-a15189102478@kernel.org>
Date: Sat, 2 Aug 2025 10:32:31 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Andrei Stefanescu <andrei.stefanescu@....nxp.com>,
 Arnd Bergmann <arnd@...db.de>, Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
 krzk+dt@...nel.org, Conor Dooley <conor+dt@...nel.org>,
 Chester Lin <chester62515@...il.com>, Matthias Brugger <mbrugger@...e.com>,
 Ghennadi Procopciuc <Ghennadi.Procopciuc@....com>,
 Larisa Grigore <larisa.grigore@....com>, Lee Jones <lee@...nel.org>,
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, aisheng.dong@....com,
 Jacky Bai <ping.bai@....com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, "Rafael J . Wysocki" <rafael@...nel.org>,
 Srinivas Kandagatla <srini@...nel.org>
Cc: "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, NXP S32 Linux Team <s32@....com>,
 Christophe Lizzi <clizzi@...hat.com>, Alberto Ruiz <aruizrui@...hat.com>,
 Enric Balletbo <eballetb@...hat.com>, echanude@...hat.com,
 Pengutronix Kernel Team <kernel@...gutronix.de>, imx@...ts.linux.dev,
 Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH v7 10/12] nvmem: s32g2_siul2: add NVMEM driver for SoC
 information

On 02/08/2025 10:28, Krzysztof Kozlowski wrote:
> On 01/08/2025 16:36, Andrei Stefanescu wrote:
>> Apart from the proposed NVMEM driver, there is also an option of exporting
>> a syscon regmap for the registers which provide information about the SoC.
>>
>> I have seen that typically NVMEM drivers export information read from fuses
>> but I think having a NVMEM driver is nicer way to access the information
>> instead of using a syscon regmap and manually extracting the needed bits. 
> 
> 
> nvmem is not a syscon. Mixing these two means device is something
> completely else.

... and yes, I am aware that three FSL/NXP bindings use nvmem as syscon
already. People are mixing hardware description (nvmem) with some
purpose for drivers (syscon) forgetting that syscon are miscellaneous
SoC internal registers, not non-volatile memory.

Best regards,
Krzysztof