linux-kernel - Re: [PATCH 0/6] Expose RPi4'd bootloader configuration

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Message-ID: <1e0ad098ca7b1c13dbc6602285b77790b9cd54a1.camel@suse.de>
Date:   Tue, 15 Dec 2020 20:01:54 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     srinivas.kandagatla@...aro.org, devicetree@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux@...linux.org.uk, will@...nel.org, robh+dt@...nel.org,
        tim.gover@...pberrypi.com, phil@...pberrypi.com
Subject: Re: [PATCH 0/6] Expose RPi4'd bootloader configuration

Hi Catalin,

On Tue, 2020-12-15 at 18:44 +0000, Catalin Marinas wrote:
> On Tue, Dec 15, 2020 at 04:56:20PM +0100, Nicolas Saenz Julienne wrote:
> > Soon to be released versions of RPi4's firmware will take of care
> > passing their bootloader's configuration to the OS by copying it into
> > memory and creating a reserved memory node in the board's DT. In order
> > to make use of this information, this series introduces a new generic
> > nvmem driver that maps reserved-memory nodes into nvmem devices.
> > 
> > An alternative approach, less nice IMO, would be to create a
> > platform-specific 'soc' driver.
> 
> What kind of information is this and how would the kernel use it?

Sorry, I wasn't clear enough, the ultimate goal is to use this information from
user-space, through nvmem's sysfs interface. The kernel itself has no use for
it.

Regards,
Nicolas


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