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Wed, 18 Feb 2026 02:56:53 -0800 (PST) Date: Wed, 18 Feb 2026 11:56:52 +0100 From: Maxime Ripard To: Thierry Reding Cc: David Airlie , Simona Vetter , Sumit Semwal , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Benjamin Gaignard , Brian Starkey , John Stultz , "T . J . Mercier" , Andrew Morton , David Hildenbrand , Mike Rapoport , Sumit Garg , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org Subject: Re: [PATCH v2 07/10] arm64: tegra: Add VPR placeholder node on Tegra234 Message-ID: <20260218-magnificent-flying-coucal-a4f1c0@houat> References: <20260122161009.3865888-1-thierry.reding@kernel.org> <20260122161009.3865888-8-thierry.reding@kernel.org> <20260123-slim-seal-of-luxury-bdb58b@houat> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha384; protocol="application/pgp-signature"; boundary="3lkrnqpcfmpi4l5q" Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Stat-Signature: rdtwunntsw15f7guhywuyha845qcfj4c X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 3A48A180003 X-HE-Tag: 1771412220-10864 X-HE-Meta: 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 hbbtzsTK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --3lkrnqpcfmpi4l5q Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v2 07/10] arm64: tegra: Add VPR placeholder node on Tegra234 MIME-Version: 1.0 On Thu, Feb 12, 2026 at 03:51:29PM +0100, Thierry Reding wrote: > On Fri, Jan 23, 2026 at 02:28:50PM +0100, Maxime Ripard wrote: > > On Thu, Jan 22, 2026 at 05:10:06PM +0100, Thierry Reding wrote: > > > From: Thierry Reding > > >=20 > > > This node contains two sets of properties, one for the case where the > > > VPR is resizable (in which case the VPR region will be dynamically > > > allocated at boot time) and another case where the VPR is fixed in si= ze > > > and initialized by early firmware. > > >=20 > > > The firmware running on the device is responsible for updating the no= de > > > with the real physical address for the fixed VPR case and remove the > > > properties needed only for resizable VPR. Similarly, if the VPR is > > > resizable, the firmware should remove the "reg" property since it is = no > > > longer needed. > > >=20 > > > Signed-off-by: Thierry Reding > > > --- > > > arch/arm64/boot/dts/nvidia/tegra234.dtsi | 34 ++++++++++++++++++++++= ++ > > > 1 file changed, 34 insertions(+) > > >=20 > > > diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/bo= ot/dts/nvidia/tegra234.dtsi > > > index 850c473235e3..62a5dfde9e38 100644 > > > --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi > > > +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi > > > @@ -29,6 +29,40 @@ aliases { > > > i2c8 =3D &dp_aux_ch3_i2c; > > > }; > > > =20 > > > + reserved-memory { > > > + #address-cells =3D <2>; > > > + #size-cells =3D <2>; > > > + ranges; > > > + > > > + vpr: video-protection-region@0 { > > > + compatible =3D "nvidia,tegra-video-protection-region"; > >=20 > > The heap name doesn't follow the documented convention, see > > https://docs.kernel.org/userspace-api/dma-buf-heaps.html#naming-convent= ion >=20 > I could change this to protected@0, which would make the name of the > exported heap "protected". protected-video would work too, but yeah, as long as it's unique, this works. Maxime --3lkrnqpcfmpi4l5q Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJUEABMJAB0WIQTkHFbLp4ejekA/qfgnX84Zoj2+dgUCaZWa7wAKCRAnX84Zoj2+ dvUhAYCm3FfvWk95XHH2FpeLOwuwKc6yGIbEd2DSsZvfEyoEj29SyLApBrBuUbbF 1e/ifR4BgM0QdBWXEmJb3YcqxnY/OdqsBvatOWUWz2hoGC3/GAFLKTRWhVfS1lbP wk++E+B39w== =Z//1 -----END PGP SIGNATURE----- --3lkrnqpcfmpi4l5q--