From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A7013546CC; Wed, 30 Sep 2026 11:50:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790769059; cv=none; b=kuTLwIny7xBqEJ6GRHdVavEFMHZ7RM4tMlBeftUDJvLFXw7nXkgPvW//NlDgti2RyvIFuTt5ofbIn8ujn86Zx66lqp9k23o9W2occtaVKA/h/T8o6ZjrO8g0RRbfD8jRdPg2V4Ji4L8g7gZKftXtc52yKu7tpuEUyMs9sDQw/TI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790769059; c=relaxed/simple; bh=cYn7Ze/P7oEkD1Z+uBj09CPrLrnPKQFy4Z7HMToNqQ8=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=WWcrnOLwYIWcAqwf/CcVcHqlvDJEOLAh7X4ySs0e4esnFJfjtZL2YSewa6ynQ40L+8cLjTgdc/E/m15QiDASEwf536hBc7zRjnXPSifd48N1syjxZcnWBH9GsDkSexQoR79mgfqfd2MbXTf8mTkjQZFpVzhKryAHdXU2Wiv8U1E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dtUhLBbl; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dtUhLBbl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AB5C1F00893; Wed, 30 Sep 2026 11:50:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790769057; bh=8XCU4MQS8FddGxbqTGB/oQsbxL2Xtt6aCSHUXFWTIFQ=; h=Date:Subject:From:To:Cc:References:In-Reply-To; b=dtUhLBblbqcZi62VlxZoeUQn0kLmO4+x8QiLE+InV0zooxBoxH5ewP8EVJ1q7EbzC +Cbxa8u+cF5x8tqhmsErHIPSro+5Ye/8h2bp+GWRtGXj+EGFy9WIbBki5wPTGWRYkN tNYEvICgG9Psr2eMPVXcrYLkz3xP78TbP9JoHqkf8ZjlcONlVdcvAyLgsxf+HmNhrL 1CYkKxCd3le6N6vT8L19NVW8GOe3bJw+bpiAWDAnaVCSyH/oesTq8E93oIdn3ydG++ TCATm/JrOwn8fDk2iokxhMtBScjgPBy4+OFcsYKubf6QB/Waz2XgdTewsWPh1LtBar lCkjUsbHrxgTw== Message-ID: Date: Wed, 30 Sep 2026 13:50:50 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/5] dt-bindings: power: reset: syscon-reboot-mode: allow supplies From: Krzysztof Kozlowski To: Alexey Charkov Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner , Sebastian Reichel , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Shawn Lin References: <20260929-b4-rk3576-reboot-mode-v2-0-5a34ca72065a@flipper.net> <20260929-b4-rk3576-reboot-mode-v2-2-5a34ca72065a@flipper.net> <20260930-fascinating-cheetah-of-speed-7cccd0@quoll> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 30/09/2026 13:47, Krzysztof Kozlowski wrote: > On Tue, Sep 29, 2026 at 02:28:19PM +0400, Alexey Charkov wrote: >> Whatever program that acts on a reboot mode runs before a full OS, so it >> may lack the capability to enable the regulators it depends on, and a >> reset that preserves the mode register generally leaves the regulators as >> the previously running system left them. >> >> Allow a reboot mode node to name such supplies, so that they can be >> turned on while the mode is being requested. >> >> Tested-by: Shawn Lin > > Again fake tag. > >> Signed-off-by: Alexey Charkov >> --- >> .../devicetree/bindings/power/reset/syscon-reboot-mode.yaml | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml >> index 79ffc78b23ea..5ed70c87269e 100644 >> --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml >> +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml >> @@ -36,6 +36,14 @@ patternProperties: >> "^mode-.*$": >> maxItems: 1 >> >> + "^[a-z0-9]+(-[a-z0-9]+)*-supply$": >> + description: >> + Supply that has to be powered for whatever program acts on the mode. >> + That could be a boot ROM with no access to regulators, and a warm reset >> + leaves them as the previously running system left them and not necessarily >> + what their expected out-of-reboot state is. Any supply described here is >> + enabled when a mode is requested, and stays enabled. > > This looks like workaround for missing supply handling in actual > consumers. Fix your devices instead. Heh, I misread - you need to power this on? Then how does your board powers itself in the first place? And how do you even solve the incorrect - e.g. too low - voltage on these regulators? Best regards, Krzysztof