From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Manikandan Muralidharan <manikandan.m@microchip.com>
Cc: <pratyush@kernel.org>, <mwalle@kernel.org>,
<takahiro.kuwano@infineon.com>, <richard@nod.at>,
<vigneshr@ti.com>, <robh@kernel.org>, <krzk+dt@kernel.org>,
<conor+dt@kernel.org>, <srini@kernel.org>,
<nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<claudiu.beznea@tuxon.dev>, <linux@armlinux.org.uk>,
<richardcochran@gmail.com>, <linusw@kernel.org>,
<arnd@arndb.de>, <aaro.koskinen@iki.fi>,
<gregkh@linuxfoundation.org>,
<mathieu.dubois-briand@bootlin.com>, <michael@walle.cc>,
<linux-mtd@lists.infradead.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <netdev@vger.kernel.org>
Subject: Re: [PATCH v8 4/8] mtd: spi-nor: sfdp: expose the SFDP as a read-only NVMEM device
Date: Wed, 14 Oct 2026 10:38:42 +0200 [thread overview]
Message-ID: <87ld80znfx.fsf@bootlin.com> (raw)
In-Reply-To: <093672d183a06dc2f37366b2f9ff144316850863.1790847519.git.manikandan.m@microchip.com> (Manikandan Muralidharan's message of "Wed, 14 Oct 2026 12:10:08 +0530")
On 14/10/2026 at 12:10:08 +0530, Manikandan Muralidharan <manikandan.m@microchip.com> wrote:
> The SPI NOR core already reads the SFDP tables during enumeration and
> caches them in nor->sfdp->dwords (see spi_nor_parse_sfdp()). Re-expose
> that cached data as a read-only NVMEM device, in on-flash byte order,
> rooted at the flash's SFDP child node (compatible "jedec,sfdp").
>
> This lets NVMEM cells reference any SFDP data: a fixed-layout for
> parameters at a known offset, or an nvmem-layout parser for vendor data
> whose location must be discovered at runtime. The device is only registered
> when an "sfdp" node is present in the device tree.
>
> Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
next prev parent reply other threads:[~2026-10-14 8:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-14 6:40 [PATCH v8 0/8] Read MAC address from SST vendor specific SFDP region Manikandan Muralidharan
2026-10-14 6:40 ` [PATCH v8 1/8] dt-bindings: mtd: jedec,spi-nor: allow the SFDP to be exposed via NVMEM Manikandan Muralidharan
2026-10-14 6:40 ` [PATCH v8 2/8] dt-bindings: nvmem: layouts: add Microchip/SST SFDP EUI layout Manikandan Muralidharan
2026-10-14 6:40 ` [PATCH v8 3/8] nvmem: core: take a reference on dev.of_node in nvmem_register() Manikandan Muralidharan
2026-10-14 8:36 ` Miquel Raynal
2026-10-14 6:40 ` [PATCH v8 4/8] mtd: spi-nor: sfdp: expose the SFDP as a read-only NVMEM device Manikandan Muralidharan
2026-10-14 8:38 ` Miquel Raynal [this message]
2026-10-14 6:40 ` [PATCH v8 5/8] nvmem: layouts: add Microchip/SST SFDP EUI layout driver Manikandan Muralidharan
2026-10-14 8:52 ` Miquel Raynal
2026-10-14 6:40 ` [PATCH v8 6/8] ARM: dts: microchip: sama5d27_wlsom1: use fixed-partitions for QSPI flash Manikandan Muralidharan
2026-10-14 6:40 ` [PATCH v8 7/8] ARM: dts: microchip: sama5d27_wlsom1: read MAC address from QSPI SFDP Manikandan Muralidharan
2026-10-14 6:40 ` [PATCH v8 8/8] ARM: configs: sama5: enable Microchip/SST SFDP EUI NVMEM layout Manikandan Muralidharan
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