linux-kernel - Re: [PATCH v4 0/5] nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP

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Date:   Tue, 10 Aug 2021 11:57:19 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>,
        Rob Herring <robh+dt@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org
Cc:     Ash Logan <ash@...quark.com>,
        Jonathan Neuschäfer <j.ne@...teo.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/5] nvmem: nintendo-otp: Add new driver for the Wii
 and Wii U OTP



On 01/08/2021 08:38, Emmanuel Gil Peyrot wrote:
> The OTP is a read-only memory area which contains various keys and
> signatures used to decrypt, encrypt or verify various pieces of storage.
> 
> Its size depends on the console, it is 128 bytes on the Wii and
> 1024 bytes on the Wii U (split into eight 128 bytes banks).
> 
> It can be used directly by writing into one register and reading from
> the other one, without any additional synchronisation.
> 
> This series has been tested on both the Wii U (using my downstream
> master-wiiu branch[1]), as well as on the Wii on mainline.
> 
> [1] https://gitlab.com/linkmauve/linux-wiiu/-/commits/master-wiiu
> 
> Changes since v1:
> - Fixed the commit messages so they can be accepted by other email
>    servers, sorry about that.
> 
> Changes since v2:
> - Switched the dt binding documentation to YAML.
> - Used more obvious register arithmetic, and tested that gcc (at -O1 and
>    above) outputs the exact same rlwinm instructions for them.
> - Use more #defines to make the code easier to read.
> - Include some links to the reversed documentation.
> - Avoid overlapping dt regions by changing the existing control@...0100
>    node to end before the OTP registers, with some bigger dt refactoring
>    left for a future series.
> 
> Changes since v3:
> - Relicense the dt-binding documentation under GPLv2-only or
>    BSD-2-clauses.
> 
> Emmanuel Gil Peyrot (5):
>    nvmem: nintendo-otp: Add new driver for the Wii and Wii U OTP
>    dt-bindings: nintendo-otp: Document the Wii and Wii U OTP support


Applied 1/5 and 2/5 to nvmem next,
rest of the patches should go via powerpc dts tree.

thanks,
--srini
>    powerpc: wii.dts: Reduce the size of the control area
>    powerpc: wii.dts: Expose the OTP on this platform
>    powerpc: wii_defconfig: Enable OTP by default
> 
>   .../bindings/nvmem/nintendo-otp.yaml          |  44 +++++++
>   arch/powerpc/boot/dts/wii.dts                 |  13 +-
>   arch/powerpc/configs/wii_defconfig            |   1 +
>   drivers/nvmem/Kconfig                         |  11 ++
>   drivers/nvmem/Makefile                        |   2 +
>   drivers/nvmem/nintendo-otp.c                  | 124 ++++++++++++++++++
>   6 files changed, 194 insertions(+), 1 deletion(-)
>   create mode 100644 Documentation/devicetree/bindings/nvmem/nintendo-otp.yaml
>   create mode 100644 drivers/nvmem/nintendo-otp.c
>