linux-kernel - Re: [PATCH] nvmem: add explicit config option to read OF fixed cells

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Message-ID: <CAFBinCDxB=xtz9mtZupBC7J5oxknN1ENHzJ-cFxX4FTDSgZeFQ@mail.gmail.com>
Date:   Tue, 21 Feb 2023 22:38:13 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
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        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
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        Kevin Hilman <khilman@...libre.com>,
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        Claudiu Beznea <claudiu.beznea@...rochip.com>,
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        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH] nvmem: add explicit config option to read OF fixed cells

Hello Rafał,

On Tue, Feb 21, 2023 at 3:50 PM Rafał Miłecki <zajec5@...il.com> wrote:
>
> From: Rafał Miłecki <rafal@...ecki.pl>
>
> NVMEM subsystem looks for fixed NVMEM cells (specified in DT) by
> default. This behaviour made sense in early days before adding support
> for dynamic cells.
>
> With every new supported NVMEM device with dynamic cells current
> behaviour becomes non-optimal. It results in unneeded iterating over DT
> nodes and may result in false discovery of cells (depending on used DT
> properties).
I am not familiar with the recent changes around dynamic cells.
Is there any discussion/summary that I can read to get up to speed?

My main thought is: if there are many "fixed OF cells" implementations
and only a few "dynamic" ones - does it make sense to flip the logic
and introduce a new "use_dynamic_of_cells" flag instead?


Best regards,
Martin