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boundary="------------LsFhzgt27erm8t4oeO0VNb4e"; protected-headers="v1" From: Matt Coster To: Marek Vasut , Marek Vasut Cc: Adam Ford , Conor Dooley , David Airlie , Frank Binns , Alessio Belle , Alexandru Dadu , Geert Uytterhoeven , Krzysztof Kozlowski , Kuninori Morimoto , Maarten Lankhorst , Magnus Damm , Maxime Ripard , Rob Herring , Simona Vetter , Thomas Zimmermann , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org Message-ID: Subject: Re: [PATCH 2/3] arm64: dts: renesas: r8a77960: Add GX6250 GPU node References: <20251013190210.142436-1-marek.vasut+renesas@mailbox.org> <20251013190210.142436-2-marek.vasut+renesas@mailbox.org> In-Reply-To: --------------LsFhzgt27erm8t4oeO0VNb4e Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Marek, On 14/10/2025 23:59, Marek Vasut wrote: > On 10/14/25 1:52 PM, Matt Coster wrote: >=20 > Hello Matt, >=20 >>> +++ b/arch/arm64/boot/dts/renesas/r8a77960.dtsi >>> @@ -2565,6 +2565,18 @@ gic: interrupt-controller@f1010000 { >>> resets =3D <&cpg 408>; >>> }; >>> + gpu: gpu@fd000000 { >>> + compatible =3D "renesas,r8a77960-gpu", >>> + "img,img-gx6250", >>> + "img,img-rogue"; >>> + reg =3D <0 0xfd000000 0 0x40000>; >>> + interrupts =3D ; >>> + clocks =3D <&cpg CPG_MOD 112>; >>> + clock-names =3D "core"; >>> + power-domains =3D <&sysc R8A7796_PD_3DG_B>; >> >> My comments here apply to the other dts patch (P3/3) as well since the= >> integration appears to be identical between the two SoCs. >> >> There are two power domains on this GPU and the SoC exposes both of >> them; no reason to fall back to the single-domain scheme here. >> >> I know the sysc driver declares the dependency of _B on _A, but the dt= s >> shouldn't rely on that, so can we have: >> >> power-domains =3D <&sysc R8A7796_PD_3DG_A>, <&sysc R8A7796_PD_3DG_= B>; >> power-domain-names =3D "a", "b"; >=20 > Both SoCs fixed in V2 , which I will post in a few days , thanks ! >=20 >>> + resets =3D <&cpg 112>; >> >> Is this a reset line? Is it a clock? >=20 > This is a reset line. The MSTP controls both clocks and resets, but > this particular phandle describes reset control. Ack >=20 >> I see this pattern used throughout >> the Renesas dts, but I'm just thinking how this will interact with the= >> powervr driver. The reset line is optional since some hardware >> integrations manage it for us during the power-up/down sequences, whic= h >> appears to be the case here with the MSTP control (from my brief dig >> through the Renesas TRM). >=20 > As far as I can tell, the pvr_power.c toggles the IP reset after the > IP clock were already enabled, so the IP should be correctly reset. > What kind of problem do you expect ? I think I'm just being paranoid about the weirdness (to me at least) of having one device be treated as both clock and reset line. Assuming this is tested as working, I'm okay with it, especially as it seems to be the norm for Renesas. >=20 >> Related, see my comments on the bindings patch (P1/3) about how clocks= >> are wired up in this SoC. > I tried to reply to that one, hopefully it makes some sense. Looks like we've figured it out there, thanks for your comments! Cheers, Matt --=20 Matt Coster E: matt.coster@imgtec.com --------------LsFhzgt27erm8t4oeO0VNb4e-- --------------xmucXCUYOvwFKqaqae5qtp9d Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wnsEABYIACMWIQS4qDmoJvwmKhjY+nN5vBnz2d5qsAUCaO99qwUDAAAAAAAKCRB5vBnz2d5qsFjl AQDeHGZAYgKly8XP0AiV5JH22pXqCnCP3v/UStcssZnEJwD9FIQa0cPtmLkJbJh2KcekilTFSdYc W7YMqbEuW0m4CQY= =uN1l -----END PGP SIGNATURE----- --------------xmucXCUYOvwFKqaqae5qtp9d--