From patchwork Mon May 17 16:58:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauri Sandberg X-Patchwork-Id: 440341 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34939C433ED for ; Mon, 17 May 2021 16:59:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D76C61185 for ; Mon, 17 May 2021 16:59:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236000AbhEQRAj (ORCPT ); Mon, 17 May 2021 13:00:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236776AbhEQRAi (ORCPT ); Mon, 17 May 2021 13:00:38 -0400 Received: from mail.kapsi.fi (mail.kapsi.fi [IPv6:2001:67c:1be8::25]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 224C0C061756 for ; Mon, 17 May 2021 09:59:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=kapsi.fi; s=20161220; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=FNchyohTk64OPI3ZQ9BXTbaOFALE2D5YS8PQlfIT8Q4=; b=X4U46V3SddCapP1G/LJEqHZPcf oHPzbd+BJWrmyu2bsUcRYa/9tk5iBIEzkBDOAVkeUNRXvbK2uFmUK+PDClGDCM7Ofpdk4EaPRlYSq OOYVKwYFMFAjpL64tMQo1m6olEGNYOOCoPASAMPPfdmaCVFapTfXKgaJRgGCQ/QJdYONh/aG10c7C bkj7gGMvgQNjXsO1d1lTkYvQXz194uKhVekru6ZzEbTeVwf+0bwELBzp4r+5csfiHb/SyUldrxphI X9ULL6dk2zB+L+xtpaS9qO6LlzN/yBbLivu2I9Ox0S3E+1QxVbfZOWXLXvCHvl/ThGCJTwY0ts7Ed 7udJAE6A==; Received: from 164-105-191-90.dyn.estpak.ee ([90.191.105.164] helo=ubuntu) by mail.kapsi.fi with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1ligaL-0003AM-4G; Mon, 17 May 2021 19:59:18 +0300 Received: by ubuntu (sSMTP sendmail emulation); Mon, 17 May 2021 19:59:16 +0300 From: Mauri Sandberg To: sandberg@mailfence.com Cc: andy.shevchenko@gmail.com, bgolaszewski@baylibre.com, geert+renesas@glider.be, linus.walleij@linaro.org, linux-gpio@vger.kernel.org, drew@beagleboard.org Subject: [PATCH v3 1/2] dt-bindings: gpio-mux-input: add documentation Date: Mon, 17 May 2021 19:58:46 +0300 Message-Id: <20210517165847.206316-2-sandberg@mailfence.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210517165847.206316-1-sandberg@mailfence.com> References: <20210325122832.119147-1-sandberg@mailfence.com> <20210517165847.206316-1-sandberg@mailfence.com> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 90.191.105.164 X-SA-Exim-Mail-From: sandberg@mailfence.com X-SA-Exim-Scanned: No (on mail.kapsi.fi); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add documentation for a general GPIO multiplexer. Signed-off-by: Mauri Sandberg --- v2 -> v3: added a complete example on dual 4-way multiplexer v1 -> v2: added a little bit more text in the binding documenation --- .../bindings/gpio/gpio-mux-input.yaml | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-mux-input.yaml diff --git a/Documentation/devicetree/bindings/gpio/gpio-mux-input.yaml b/Documentation/devicetree/bindings/gpio/gpio-mux-input.yaml new file mode 100644 index 000000000000..a7ff5d1fd6f3 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-mux-input.yaml @@ -0,0 +1,75 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/gpio/gpio-mux-input.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic GPIO input multiplexer + +maintainers: + - Mauri Sandberg + +description: | + A generic GPIO based input multiplexer + + This driver uses a mux-controller to drive the multiplexer and has a single + output pin for reading the inputs to the mux. + + For GPIO consumer documentation see gpio.txt. + +properties: + compatible: + enum: + - gpio-mux-input + + gpio-controller: true + + '#gpio-cells': + const: 2 + + pin-gpios: + description: | + The GPIO pin used as the output from the multiplexer + +required: + - compatible + - gpio-controller + - "#gpio-cells" + - pin-gpios + +additionalProperties: false + +examples: + - | + #include + mux: mux-controller { + compatible = "gpio-mux"; + #mux-control-cells = <0>; + + mux-gpios = <&gpio 9 GPIO_ACTIVE_HIGH>, + <&gpio 11 GPIO_ACTIVE_HIGH>; + }; + + gpio2: key-mux1 { + compatible = "gpio-mux-input"; + mux-controls = <&mux>; + + gpio-controller; + #gpio-cells = <2>; + + // GPIOs used by this node, mux pin + pin-gpios = <&gpio 12 GPIO_ACTIVE_HIGH>; + }; + + gpio3: key-mux2 { + compatible = "gpio-mux-input"; + mux-controls = <&mux>; + + gpio-controller; + #gpio-cells = <2>; + + // GPIOs used by this node, mux pin + pin-gpios = <&gpio 14 GPIO_ACTIVE_HIGH>; + }; + +...