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Fri, 30 Apr 2021 05:02:09 -0400 (EDT) Date: Fri, 30 Apr 2021 11:02:06 +0200 From: Maxime Ripard To: Samuel Holland Cc: Alessandro Zummo , Alexandre Belloni , Chen-Yu Tsai , Jernej Skrabec , linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] rtc: sun6i: Add NVMEM provider Message-ID: <20210430090206.lybmygrt636nysoc@gilmour> References: <20210419014549.26900-1-samuel@sholland.org> MIME-Version: 1.0 In-Reply-To: <20210419014549.26900-1-samuel@sholland.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210430_020223_053667_EAD4CCC5 X-CRM114-Status: GOOD ( 15.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============2698184388292183835==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============2698184388292183835== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="fagotahmttw7paj5" Content-Disposition: inline --fagotahmttw7paj5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. >=20 > Expose the region as a NVMEM provider so it can be used by userspace and > other drivers. >=20 > Signed-off-by: Samuel Holland 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 --fagotahmttw7paj5 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCYIvHjgAKCRDj7w1vZxhR xTOBAP0Rfdrjnm4BacZf9DU1EbJC54KUDmMAzK50SbcJXtbhHAD/eNcNK0T9vFFg I7pP8ZUb2A08JyqHhtYcV4WAI+g8mQw= =2kGL -----END PGP SIGNATURE----- --fagotahmttw7paj5-- --===============2698184388292183835== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============2698184388292183835==--