From nobody Tue Feb 10 04:13:41 2026 Received: from layka.disroot.org (layka.disroot.org [178.21.23.139]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 69ED92F1FF4; Sun, 25 Jan 2026 19:08:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.21.23.139 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769368130; cv=none; b=SyRQXX5mrI41zlDsq//GVneXyMcqgvEu0rZWG6UDK7p2j4P/CfHn1NCn23QkX7fofk+eACDrKqhq/UHNIgjriDgn3lA+/r4KoG2Jv4+IGIVjKHq2vUswzaNTpizVCF36l2i8CWpm+/qPVFYqnhvpvJ6LrRbS4NrXW+tPmj19BCU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769368130; c=relaxed/simple; bh=9yWBI+gYov2ELwPEW/EaRpgooS+fd0CmNyD5hHzzb0w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=aSzht5sur0+jAVmgT/QH/b+mqSJ+nXao+e2SV7OJLVrQfXfDCsydgnGiUnFYZwImm70jy11NcYm5qE/IAaFZLZd1roIy7ayZmoWSXZtm0B3tfsqwtq27aGvA5PC4PiZutuXuanrPkAhbdRqPMVOtoTEfJLSpWqPIsoq5Xx2u3wY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=disroot.org; spf=pass smtp.mailfrom=disroot.org; dkim=pass (2048-bit key) header.d=disroot.org header.i=@disroot.org header.b=O4EZu5wz; arc=none smtp.client-ip=178.21.23.139 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=disroot.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=disroot.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=disroot.org header.i=@disroot.org header.b="O4EZu5wz" Received: from [127.0.0.1] (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id 1302B2808A; Sun, 25 Jan 2026 20:08:48 +0100 (CET) X-Virus-Scanned: SPAM Filter at disroot.org Received: from layka.disroot.org ([127.0.0.1]) by localhost (disroot.org [127.0.0.1]) (amavis, port 10024) with ESMTP id XrrZa3dgvy94; Sun, 25 Jan 2026 20:08:47 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1769368127; bh=9yWBI+gYov2ELwPEW/EaRpgooS+fd0CmNyD5hHzzb0w=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=O4EZu5wz2wFjdZB/Z49AB3movTpgseYvABkQ4Te9oOAKs+ea61sqWtBFtGmInMstx H/gMKfi3gtqiZyGEmYtvXGmW0LWcgoV1xKu6HcKM2/ciPF2nzTw6h10SFmkTTWkbiG +9E96QA43KbzPBRx6vT/g5UxtH5XON0KHTGlfJXXQsO/1DAaHZAC8fnaSkgfszJsw6 xt0tUqDZSPfaj116zNl8pay7BzT+x2Tn+K5GiuFL0NGkJKIlhQU4dFNcNtq3fZ3Unv rhBdq/8Q2+OcuaoXajHs1KqKBFFqU2UuRuQkhjbaPgXXAmr1I46Lu4YDpBohZgKjw7 O8Fp2UknCJbdw== From: Kaustabh Chakraborty Date: Mon, 26 Jan 2026 00:37:17 +0530 Subject: [PATCH v2 10/12] Documentation: leds: document pattern behavior of Samsung S2M series PMIC RGB LEDs 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: <20260126-s2mu005-pmic-v2-10-78f1a75f547a@disroot.org> References: <20260126-s2mu005-pmic-v2-0-78f1a75f547a@disroot.org> In-Reply-To: <20260126-s2mu005-pmic-v2-0-78f1a75f547a@disroot.org> To: Lee Jones , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , MyungJoo Ham , Chanwoo Choi , Sebastian Reichel , Krzysztof Kozlowski , =?utf-8?q?Andr=C3=A9_Draszik?= , Alexandre Belloni , Jonathan Corbet , Shuah Khan Cc: linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-rtc@vger.kernel.org, linux-doc@vger.kernel.org, Kaustabh Chakraborty Add documentation to describe how hardware patterns (as defined by the documentation of led-class-multicolor) are parsed and implemented by the Samsung S2M series PMIC RGB LED driver. Signed-off-by: Kaustabh Chakraborty --- Documentation/leds/index.rst | 1 + Documentation/leds/leds-s2m-rgb.rst | 60 +++++++++++++++++++++++++++++++++= ++++ 2 files changed, 61 insertions(+) diff --git a/Documentation/leds/index.rst b/Documentation/leds/index.rst index 76fae171039c6..05d8e8517a807 100644 --- a/Documentation/leds/index.rst +++ b/Documentation/leds/index.rst @@ -27,6 +27,7 @@ LEDs leds-lp55xx leds-mlxcpld leds-mt6370-rgb + leds-s2m-rgb leds-sc27xx leds-st1202 leds-qcom-lpg diff --git a/Documentation/leds/leds-s2m-rgb.rst b/Documentation/leds/leds-= s2m-rgb.rst new file mode 100644 index 0000000000000..4f89a8c89ea86 --- /dev/null +++ b/Documentation/leds/leds-s2m-rgb.rst @@ -0,0 +1,60 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Samsung S2M Series PMIC RGB LED Driver +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Description +----------- + +The RGB LED on the S2M series PMIC hardware features a three-channel LED t= hat +is grouped together as a single device. Furthermore, it supports 8-bit +brightness control for each channel. This LED is typically used as a status +indicator in mobile devices. It also supports various parameters for hardw= are +patterns. + +The hardware pattern can be programmed using the "pattern" trigger, using = the +hw_pattern attribute. + +/sys/class/leds//repeat +---------------------------- + +The hardware supports only indefinitely repeating patterns. The repeat +attribute must be set to -1 for hardware patterns to function. + +/sys/class/leds//hw_pattern +-------------------------------- + +Specify a hardware pattern for the RGB LEDs. + +The pattern is a series of brightness levels and durations in milliseconds. +There should be only one non-zero brightness level. Unlike the results +described in leds-trigger-pattern, the transitions between on and off stat= es +are smoothed out by the hardware. + +Simple pattern:: + + "255 3000 0 1000" + + 255 -+ ''''''-. .-'''''''-. + | '. .' '. + | \ / \ + | '. .' '. + | '-.......-' '- + 0 -+-------+-------+-------+-------+-------+-------+--> time (s) + 0 1 2 3 4 5 6 + +As described in leds-trigger-pattern, it is also possible to use zero-leng= th +entries to disable the ramping mechanism. + +On-Off pattern:: + + "255 1000 255 0 0 1000 0 0" + + 255 -+ ------+ +-------+ +-------+ + | | | | | | + | | | | | | + | | | | | | + | +-------+ +-------+ +------- + 0 -+-------+-------+-------+-------+-------+-------+--> time (s) + 0 1 2 3 4 5 6 --=20 2.52.0