linux-kernel - Re: [PATCH v5 2/2] nvmem: add new NXP QorIQ eFuse driver

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Date: Tue, 12 Mar 2024 18:09:03 -0400
From: Sean Anderson <sean.anderson@...o.com>
To: Richard Alpe <richard@...42.se>, srinivas.kandagatla@...aro.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 niklas.soderlund+renesas@...natech.se, Michael Walle <michael@...le.cc>
Subject: Re: [PATCH v5 2/2] nvmem: add new NXP QorIQ eFuse driver

On 4/10/23 04:20, Richard Alpe wrote:
> Add SFP (Security Fuse Processor) read support for NXP (Freescale)
> QorIQ series SOC's.
>
> This patch adds support for the T1023 SOC using the SFP offset from
> the existing T1023 device tree. In theory this should also work for
> T1024, T1014 and T1013 which uses the same SFP base offset.
>
> Signed-off-by: Richard Alpe <richard@...42.se>

This seems like a duplicate of layerscape-sfp.c. The hardware is
(presumably) quite similar, with the T1024RM referencing the QorIQ Trust
Architecture User Guide version 2.0, and the L1046 (e.g.) referencing
version 2.1.

I think this driver should be removed in favor of the older driver.
There are some problematic bits: most notably no offset is applied by
this driver, so all fuses have an offset of 0x200. So we will need to
implement/document this only for the "fsl,t1023-sfp" compatible, which
has already made its way into the T1023 devicetree...

This really should have been caught during review; a quick grep for
"SFP" would have revealed the duplication.

--Sean

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