From: "Alexey Klimov" <alexey.klimov@linaro.org>
To: "Sam Protsenko" <semen.protsenko@linaro.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>
Cc: <linux-samsung-soc@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Alim Akhtar" <alim.akhtar@samsung.com>
Subject: Re: [PATCH] arm64: dts: exynos850: Add syscon-poweroff node
Date: Mon, 20 Apr 2026 16:04:43 +0100 [thread overview]
Message-ID: <DHY2P02B6E6H.J79TDOADC4BS@linaro.org> (raw)
In-Reply-To: <20260325-exynos850-poweroff-v1-1-34c19c06e74d@linaro.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 <alexey.klimov@linaro.org>
> ---
> arch/arm64/boot/dts/exynos/exynos850.dtsi | 7 +++++++
Any feedback on this?
BR,
Alexey
next prev parent reply other threads:[~2026-04-20 15:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 0:26 [PATCH] arm64: dts: exynos850: Add syscon-poweroff node Alexey Klimov
2026-04-20 15:04 ` Alexey Klimov [this message]
2026-04-20 15:18 ` Krzysztof Kozlowski
2026-04-20 15:20 ` Krzysztof Kozlowski
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