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Mon, 20 Apr 2026 08:04:44 -0700 (PDT) Received: from localhost ([94.4.195.193]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ba4550468d6sm358274166b.52.2026.04.20.08.04.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Apr 2026 08:04:44 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 20 Apr 2026 16:04:43 +0100 Message-Id: Cc: , , , , "Rob Herring" , "Conor Dooley" , "Alim Akhtar" Subject: Re: [PATCH] arm64: dts: exynos850: Add syscon-poweroff node From: "Alexey Klimov" To: "Sam Protsenko" , "Krzysztof Kozlowski" X-Mailer: aerc 0.21.0 References: <20260325-exynos850-poweroff-v1-1-34c19c06e74d@linaro.org> In-Reply-To: <20260325-exynos850-poweroff-v1-1-34c19c06e74d@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260420_080447_701936_A3C7211F X-CRM114-Status: GOOD ( 11.77 ) 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 Mar 25, 2026 at 12:26 AM GMT, Alexey Klimov wrote: > Without poweroff node Exynos850-based board continue to draw current > (around ~60 mA with my test setup) after poweroff. Kernel also reports > different lockup problems and RCU stalls warnings continuosly after > last kernel messages about hardware being switched off. > Turns out we missed a write to PMU's PS_HOLD_CONTROL (PMU + 0x30c) > register that actually switches the SoC off. > > Add poweroff node that implements this. > > With this change the current draw after power off is in range of few > milliampers and lockup messages are no more. > > Signed-off-by: Alexey Klimov > --- > arch/arm64/boot/dts/exynos/exynos850.dtsi | 7 +++++++ Any feedback on this? BR, Alexey