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Wed, 24 Sep 2025 09:37:31 +0000 Date: Wed, 24 Sep 2025 10:37:30 +0100 Message-ID: <86a52k199h.wl-maz@kernel.org> From: Marc Zyngier To: Kuninori Morimoto Cc: Geert Uytterhoeven , "Liang, Kan" , Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Catalin Marinas , Conor Dooley , Douglas Anderson , Geert Uytterhoeven , Ian Rogers , Ingo Molnar , James Clark , Jiri Olsa , John Garry , Krzysztof Kozlowski , Leo Yan , Lorenzo Pieralisi , Mark Rutland , Mike Leach , Namhyung Kim , Oliver Upton , Peter Zijlstra , Rob Herring , Will Deacon , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH v5 6/7] arm64: dts: renesas: Add R8A78000 X5H DTs In-Reply-To: <87plbgafkj.wl-kuninori.morimoto.gx@renesas.com> References: <87ms6snut0.wl-kuninori.morimoto.gx@renesas.com> <87ecs4nult.wl-kuninori.morimoto.gx@renesas.com> <86ikhg13m1.wl-maz@kernel.org> <877bxuzvs6.wl-maz@kernel.org> <87plbgafkj.wl-kuninori.morimoto.gx@renesas.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kuninori.morimoto.gx@renesas.com, geert@linux-m68k.org, kan.liang@linux.intel.com, adrian.hunter@intel.com, alexander.shishkin@linux.intel.com, acme@kernel.org, catalin.marinas@arm.com, conor+dt@kernel.org, dianders@chromium.org, geert+renesas@glider.be, irogers@google.com, mingo@redhat.com, james.clark@linaro.org, jolsa@kernel.org, john.g.garry@oracle.com, krzk+dt@kernel.org, leo.yan@linux.dev, lpieralisi@kernel.org, mark.rutland@arm.com, mike.leach@linaro.org, namhyung@kernel.org, oliver.upton@linux.dev, peterz@infradead.org, robh@kernel.org, will@kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-renesas-soc@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250924_023735_227223_DF28F560 X-CRM114-Status: GOOD ( 23.32 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 24 Sep 2025 00:56:28 +0100, Kuninori Morimoto wrote: > > > Hi Marc > > # sorry for late response. I had took day-off > > > > > > + /* > > > > > + * The ARM GIC-720AE - View 1 > > > > > + * > > > > > + * see > > > > > + * r19uh0244ej0052-r-carx5h.pdf > > > > > + * - attachments: 002_R-CarX5H_Address_Map_r0p51.xlsx > > > > > + * - sheet [RT] > > > > > + * - line 619 > > > > > + */ > (snip) > > Something like: > > > > /* Application Processors manage View-1 of a GIC-720AE */ > > > > and the mention of the TRM and other spreadsheets dropped. > > OK, will do > > > the ITS to be described. The HW has it, it has no dependency on > > anything else, so there is no reason to omit it. > > I had asked HW team and PCI team, and there is a valid reason > why we would like to skip it. Because we had issues with using ITS on > previous SoCs. Hence we are reluctant to describe it until we can > actually test it. Posting patches for partially HW doesn't feel like a great approach. > So far, we never submitted a complete .dtsi in one go, but always enabled > more functionality in incremental steps, after verifying that it actually > works. Well, the GIC (and specially ARM's implementation) is a whole entity, not something you can cut and dice. Just like you wouldn't describe the CPUs without their timers. M. -- Without deviation from the norm, progress is not possible.