From nobody Mon Feb 9 16:45:41 2026 Received: from mail.hugovil.com (mail.hugovil.com [162.243.120.170]) (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 469B8190462; Tue, 3 Feb 2026 16:06:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=162.243.120.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770134766; cv=none; b=TZMWXzAxL/So3FpScoEDuN6jbltRZKa/vfUq7ZJu+jQ0zDJMrGdNwRoQefA5Lc4lxfFagsEHiYz+342+QMnOCDLHFExiuK00NwRitjKdpgcnzVFlhZoRG31dr89IOTJw0R1bZ1YwkWFA8MxGWUR0mqmUtTnf3W4Ua87lNhOtsg8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770134766; c=relaxed/simple; bh=jCJiyRHuuKJBPzYahAXx7huO18KrkcOqRN3zYjFMfq0=; h=From:To:Cc:Date:Message-ID:In-Reply-To:References:MIME-Version: Subject; b=AFIk3dABVEWwdynZyCLnkHcOTNoh0ihjMGKUfMt/2Q6R/QQHBGed8i1KVbQNuI+Ue20vdjnXmOWf0D3NN9j9j4ZpG1iJNeq2rl5Hk2a8RqVSD8vvSUCBRj2g2vZNo4trmsV/z5iLZ04By34/7kE9TBZX/irxw9Y4TdzRBU1dSPg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hugovil.com; spf=pass smtp.mailfrom=hugovil.com; dkim=pass (1024-bit key) header.d=hugovil.com header.i=@hugovil.com header.b=OF78wZqX; arc=none smtp.client-ip=162.243.120.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hugovil.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hugovil.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hugovil.com header.i=@hugovil.com header.b="OF78wZqX" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hugovil.com ; s=x; h=Subject:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Cc:To :From:subject:date:message-id:reply-to; bh=eTJbAHAyZW9VsvHuKNy01JGBVwJyYv46g0ikfNP6MV0=; b=OF78wZqXHJFb/SnY3uC3f2CteR s1L6l9XfAMErL+uqJ/RQBQ56aCw+em6U2HF8FquTmT0T4Ku/fgCY6rWH7qaO6UwHmk0Z0+O9eI8h0 5dHAnf3WAZBeqOKTVaKSHNklIZu+XBlzHRjNpfu7bPk6WmjzHIZvDhFRbPaALizYp48A=; Received: from modemcable168.174-80-70.mc.videotron.ca ([70.80.174.168]:53840 helo=pettiford.lan) by mail.hugovil.com with esmtpa (Exim 4.92) (envelope-from ) id 1vnIfc-0000uz-Pp; Tue, 03 Feb 2026 10:50:29 -0500 From: Hugo Villeneuve To: hvilleneuve@dimonoff.com, dmitry.torokhov@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, hugo@hugovil.com Date: Tue, 3 Feb 2026 10:49:47 -0500 Message-ID: <20260203155023.536103-2-hugo@hugovil.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260203155023.536103-1-hugo@hugovil.com> References: <20260203155023.536103-1-hugo@hugovil.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 70.80.174.168 X-SA-Exim-Mail-From: hugo@hugovil.com X-Spam-Level: X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP Subject: [PATCH 1/2] dt-bindings: input: add GPIO charlieplex keypad X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.hugovil.com) Content-Type: text/plain; charset="utf-8" From: Hugo Villeneuve Add DT bindings for GPIO charlieplex keypad. Signed-off-by: Hugo Villeneuve --- .../input/gpio-charlieplex-keypad.yaml | 88 +++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/gpio-charlieple= x-keypad.yaml diff --git a/Documentation/devicetree/bindings/input/gpio-charlieplex-keypa= d.yaml b/Documentation/devicetree/bindings/input/gpio-charlieplex-keypad.ya= ml new file mode 100644 index 0000000000000..b382c8caa096d --- /dev/null +++ b/Documentation/devicetree/bindings/input/gpio-charlieplex-keypad.yaml @@ -0,0 +1,88 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- + +$id: http://devicetree.org/schemas/input/gpio-charlieplex-keypad.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: GPIO charlieplex keypad + +maintainers: + - Hugo Villeneuve + +description: + The charlieplex keypad supports N^2)-N different key combinations (where= N is + the number of lines). Key presses and releases are detected by configuri= ng + only one line as output at a time, and reading other line states. This p= rocess + is repeated for each line. + This mechanism doesn't allow to detect simultaneous key presses. + +allOf: + - $ref: input.yaml# + - $ref: /schemas/input/matrix-keymap.yaml# + +properties: + compatible: + const: gpio-charlieplex-keypad + + line-scan-delay-us: + description: + Delay, measured in microseconds, that is needed + before we can scan keypad after activating one line. + default: 0 + + line-gpios: + description: + List of GPIOs used as lines. The gpio specifier for this property + depends on the gpio controller to which these lines are connected. + + linux,keymap: true + + linux,no-autorepeat: + type: boolean + description: Do not enable autorepeat feature. + + gpio-activelow: + type: boolean + description: + Force GPIO polarity to active low. + In the absence of this property GPIOs are treated as active high. + + debounce-delay-ms: + description: Debounce interval in milliseconds. + default: 5 + + poll-interval: true + + wakeup-source: true + +required: + - compatible + - line-gpios + - linux,keymap + - poll-interval + +additionalProperties: false + +examples: + - | + charlieplex-keypad { + compatible =3D "gpio-charlieplex-keypad"; + debounce-delay-ms =3D <20>; + poll-interval =3D <5>; + line-scan-delay-us =3D <2>; + + line-gpios =3D <&gpio2 25 0 + &gpio2 26 0 + &gpio2 27 0>; + + /* MATRIX_KEY(output, input, key-code) */ + linux,keymap =3D < + MATRIX_KEY(0, 1, KEY_F1) + MATRIX_KEY(0, 2, KEY_F2) + MATRIX_KEY(1, 0, KEY_F3) + MATRIX_KEY(1, 2, KEY_F4) + MATRIX_KEY(2, 0, KEY_F5) + MATRIX_KEY(2, 1, KEY_F6) + >; + }; --=20 2.47.3