Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Sun, 3 Jan 2021 09:16:32 -0700
From:   Rob Herring <robh@kernel.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc:     linux-kernel@vger.kernel.org, phil@raspberrypi.com,
        tim.gover@raspberrypi.com, catalin.marinas@arm.com,
        srinivas.kandagatla@linaro.org, devicetree@vger.kernel.org,
        linux-rpi-kernel@lists.infradead.org,
        Frank Rowand <frowand.list@gmail.com>, linux@armlinux.org.uk,
        bcm-kernel-feedback-list@broadcom.com,
        linux-arm-kernel@lists.infradead.org,
        Rob Herring <robh+dt@kernel.org>, will@kernel.org
Subject: Re: [PATCH v2 2/5] nvmem: Add driver to expose reserved memory as
 nvmem
Message-ID: <20210103161632.GA3960550@robh.at.kernel.org>
References: <20201218154320.28368-1-nsaenzjulienne@suse.de>
 <20201218154320.28368-3-nsaenzjulienne@suse.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20201218154320.28368-3-nsaenzjulienne@suse.de>
Precedence: bulk

On Fri, 18 Dec 2020 16:43:17 +0100, Nicolas Saenz Julienne wrote:
> Firmware/co-processors might use reserved memory areas in order to pass
> data stemming from an nvmem device otherwise non accessible to Linux.
> For example an EEPROM memory only physically accessible to firmware, or
> data only accessible early at boot time.
> 
> In order to expose this data to other drivers and user-space, the driver
> models the reserved memory area as an nvmem device.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> 
> ---
> 
> Changes since v1:
>  - Remove reserved memory phandle indirection by directly creating a
>    platform device from the reserved memory DT node
>  - Only map memory upon reading it to avoid corruption
>  - Small cosmetic cleanups
> 
>  drivers/nvmem/Kconfig  |  8 ++++
>  drivers/nvmem/Makefile |  2 +
>  drivers/nvmem/rmem.c   | 97 ++++++++++++++++++++++++++++++++++++++++++
>  drivers/of/platform.c  |  1 +
>  4 files changed, 108 insertions(+)
>  create mode 100644 drivers/nvmem/rmem.c
> 

Reviewed-by: Rob Herring <robh@kernel.org>