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Date: Sun, 3 Jan 2021 09:16:32 -0700 From: Rob Herring <robh@...nel.org> To: Nicolas Saenz Julienne <nsaenzjulienne@...e.de> Cc: linux-kernel@...r.kernel.org, phil@...pberrypi.com, tim.gover@...pberrypi.com, catalin.marinas@....com, srinivas.kandagatla@...aro.org, devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org, Frank Rowand <frowand.list@...il.com>, linux@...linux.org.uk, bcm-kernel-feedback-list@...adcom.com, linux-arm-kernel@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>, will@...nel.org Subject: Re: [PATCH v2 2/5] nvmem: Add driver to expose reserved memory as nvmem 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@...e.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@...nel.org>
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