linux-kernel - Re: [PATCH] rtc: sun6i: Add NVMEM provider

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Message-ID: <20210430090206.lybmygrt636nysoc@gilmour>
Date:   Fri, 30 Apr 2021 11:02:06 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: sun6i: Add NVMEM provider

Hi,

On Sun, Apr 18, 2021 at 08:45:49PM -0500, Samuel Holland wrote:
> The sun6i RTC provides 32 bytes of general-purpose data registers.
> They can be used to save data in the always-on RTC power domain.
> The registers are writable via 32-bit MMIO accesses only.
> 
> Expose the region as a NVMEM provider so it can be used by userspace and
> other drivers.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

As far as I understood, you want to use those registers to implement
super-standby? If so, while it makes sense for the kernel to be able to
be able to write to those registers, I guess it would be a bit unwise to
allow the userspace to access it?

Maxime

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