From: "Rob Herring (Arm)" <robh@kernel.org>
To: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com>
Cc: linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org,
git@amd.com, devicetree@vger.kernel.org, conor+dt@kernel.org,
miquel.raynal@bootlin.com, krzk+dt@kernel.org, richard@nod.at,
amitrkcian2002@gmail.com, vigneshr@ti.com
Subject: Re: [PATCH v14 1/3] dt-bindings: mtd: Describe MTD partitions concatenation
Date: Thu, 26 Jun 2025 21:41:35 -0500 [thread overview]
Message-ID: <175099209513.1650937.6817719319563715561.robh@kernel.org> (raw)
In-Reply-To: <20250623105445.2394825-2-amit.kumar-mahapatra@amd.com>
On Mon, 23 Jun 2025 16:24:43 +0530, Amit Kumar Mahapatra wrote:
> The AMD QSPI controller supports an advanced connection modes called
> Stacked mode which allow the controller to treat two different flashes
> as one storage.
>
> In Stacked connection mode flashes share the same SPI bus, but different CS
> line, controller driver asserts the CS of the flash to which it needs to
> communicate. Stacked mode is a software abstraction rather than a
> controller feature or capability. At any given time, the controller
> communicates with one of the two connected flash devices, as determined by
> the requested address and data length. If an operation starts on one flash
> and ends on the other, the mtd layer needs to split it into two separate
> operations and adjust the data length accordingly. For more information on
> the modes please feel free to go through the controller flash interface
> below [1].
>
> To support stacked mode, the existing MTD concat driver has been extended
> to be more generic, enabling multiple sets of MTD partitions to be
> virtually concatenated, with each set forming a distinct logical MTD
> device.
>
> A new Device Tree property is introduced to facilitate this, containing
> phandles of the partitions to be concatenated with the one where the
> property is defined. This approach supports multiple sets of concatenated
> partitions.
>
> [1] https://docs.amd.com/r/en-US/am011-versal-acap-trm/QSPI-Flash-Device-Interface
>
> Suggested-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com>
> ---
> .../bindings/mtd/partitions/partition.yaml | 20 +++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
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next prev parent reply other threads:[~2025-06-27 2:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-23 10:54 [PATCH v14 0/3] mtd: Add support for stacked memories Amit Kumar Mahapatra
2025-06-23 10:54 ` [PATCH v14 1/3] dt-bindings: mtd: Describe MTD partitions concatenation Amit Kumar Mahapatra
2025-06-27 2:41 ` Rob Herring (Arm) [this message]
2025-06-23 10:54 ` [PATCH v14 2/3] mtd: Move struct mtd_concat definition to header file Amit Kumar Mahapatra
2025-06-23 10:54 ` [PATCH v14 3/3] mtd: Add driver for concatenating devices Amit Kumar Mahapatra
2025-09-01 12:29 ` [PATCH v14 0/3] mtd: Add support for stacked memories Miquel Raynal
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