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Fri, 14 Nov 2025 04:00:37 -0800 (PST) From: Peter Griffin Date: Fri, 14 Nov 2025 12:00:17 +0000 Subject: [PATCH v2 2/2] arm64: dts: exynos: gs101: remove syscon compatible from pmu node Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251114-remove-pmu-syscon-compat-v2-2-9496e8c496c7@linaro.org> References: <20251114-remove-pmu-syscon-compat-v2-0-9496e8c496c7@linaro.org> In-Reply-To: <20251114-remove-pmu-syscon-compat-v2-0-9496e8c496c7@linaro.org> To: =?utf-8?q?Andr=C3=A9_Draszik?= , Tudor Ambarus , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar Cc: linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com, willmcvicker@google.com, dan.carpenter@linaro.org, arnd@arndb.de, robh@kernel.org, Peter Griffin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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a=openpgp; fpr=0EFC8E6F5578750D56B549FCCEE8B8D6023472BA Since commit ba5095ebbc7a ("mfd: syscon: Allow syscon nodes without a "syscon" compatible") it is possible to register a regmap without the syscon compatible in the node. As mentioned in that commit, it's not correct to claim we are compatible with syscon, as a MMIO regmap created by syscon won't work. Removing the syscon compatible means syscon driver won't ever create a mmio regmap. Note this isn't usually an issue today as exynos-pmu runs at an early initcall so the custom regmap will have been registered first. However changes proposed in [1] will bring -EPROBE_DEFER support to syscon allowing this mechanism to be more robust, especially in highly modularized systems. Technically this is a ABI break but no other platforms are affected. Additionally (with the benefit of hindsight) a MMIO syscon has never worked for PMU register writes, thus the ABI break is justified. Link: https://lore.kernel.org/lkml/aQdHmrchkmOr34r3@stanley.mountain/ [1] Signed-off-by: Peter Griffin --- Changes in v2: - Update commit message (Krzysztof) --- arch/arm64/boot/dts/exynos/google/gs101.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot= /dts/exynos/google/gs101.dtsi index d06d1d05f36408137a8acd98e43d48ea7d4f4292..e1a7d33fd4a369f7b352b81d207= 0beb62a0ced16 100644 --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi @@ -1705,7 +1705,7 @@ sysreg_apm: syscon@17420000 { }; =20 pmu_system_controller: system-controller@17460000 { - compatible =3D "google,gs101-pmu", "syscon"; + compatible =3D "google,gs101-pmu"; reg =3D <0x17460000 0x10000>; google,pmu-intr-gen-syscon =3D <&pmu_intr_gen>; =20 --=20 2.52.0.rc1.455.g30608eb744-goog