From mboxrd@z Thu Jan 1 00:00:00 1970 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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 42F9EC433F5 for ; Wed, 22 Sep 2021 02:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22736610A0 for ; Wed, 22 Sep 2021 02:18:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229909AbhIVCTp (ORCPT ); Tue, 21 Sep 2021 22:19:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229505AbhIVCTo (ORCPT ); Tue, 21 Sep 2021 22:19:44 -0400 Received: from mail-lf1-x12c.google.com (mail-lf1-x12c.google.com [IPv6:2a00:1450:4864:20::12c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93C40C061574 for ; Tue, 21 Sep 2021 19:18:15 -0700 (PDT) Received: by mail-lf1-x12c.google.com with SMTP id i4so5635438lfv.4 for ; Tue, 21 Sep 2021 19:18:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to:cc; bh=LBOruX2eR+7jKvauM9hlcjfuarnMAn6pU6m++oNSb8U=; b=SsyJ2ECclE6NdhcOjZbcgEnX4q1ukfwBn9f5NinLZnR2aD/srYBY01kObiengWoLUo ICYh7i9nA8AH/NVAoYnZ7Tx8X5tAHVZRGM+VmtyWx+Jqt9ppppKhQxuiqn6EBThPDTlj GzqmOv1XJ4lA9jQESPRaH4Lxzh+XEKPsAeYbl82/Ir5A8mN06v69hRmmiY9q/uYC9y+f WzR3N12EN8UXgCb2igOXe7sg9o4zOdQVBMbhXqVPudRGLM/z+TRQ8J7ALthFHyX7iN+Q Wg0jF4YvLphCGMv1gQUlbrhPvRK94RNsG5toyunQp4lmB7E5oG+26MthKN91V2NolYJ7 EeJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=LBOruX2eR+7jKvauM9hlcjfuarnMAn6pU6m++oNSb8U=; b=UZbLEd6uSCWt6Bhgw4LXHtcfvACa1j20gNKFKDFVHyYePoXS1uOK2IEHcS3s/h7VQ2 EAW/ou/k0kDr1v/yevmsKfIEtGdZbxo+KVtKK0C//90RmeuCWGunQ3QTd1fo5j3sOpAF 2PLNRflvr66LGzrCXypeLc7QmgInV16HWR8VrkCEvh6ulmPgNy1gUhLnWJ9i6Ru/iIa4 gl/J5kRsc+T/89j4Uc6RrZ58c7ZjOsQi2kB0f7M8pwbV9BwjH692+4OTQ53bT7UOsic5 P25w6+79EE78dgm9xc3RqiXcIpiMwgZpvPg9NB4IHztDwqvfxhLy4tps4QwRvWX+Qz02 67RQ== X-Gm-Message-State: AOAM533t+4T0eZiBPIJvBQoen2IImZLVR+wLsmQHHIa5m6hq7WBBVdoa 1Fd65D4g/wVmpSgstzzXGGhJJkzFrHHKAv9E5a2AudfLnic= X-Google-Smtp-Source: ABdhPJwUoizOr+m8BB4a5GdXFbPtVS1OadAo1cgoMoozwckSvjDFwlpM8b4gBhVbfKyzotvxk/OlEgo7e5OgQMit3mY= X-Received: by 2002:ac2:4bc1:: with SMTP id o1mr25486027lfq.113.1632277093913; Tue, 21 Sep 2021 19:18:13 -0700 (PDT) MIME-Version: 1.0 From: Fabio Estevam Date: Tue, 21 Sep 2021 23:18:02 -0300 Message-ID: Subject: Reading ADC that comes from a multiplexer To: Peter Rosin Cc: linux-iio@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Hi Peter, I have a SN74LV4051 multiplexer that is controlled by 3 GPIOs and I described like this in DT: adcmux: mux-controller { compatible = "gpio-mux"; #mux-control-cells = <0>; mux-gpios = <&gpio3 31 GPIO_ACTIVE_HIGH>, <&gpio3 30 GPIO_ACTIVE_HIGH>, <&gpio3 26 GPIO_ACTIVE_HIGH>; }; adc-mux { compatible = "io-channel-mux"; io-channels = <&adc 4>; io-channel-names = "parent"; mux-controls = <&adcmux>; channels = "chan0", "chan1", "chan2", "chan3", "chan4", "chan5", "chan6", "chan7"; }; /sys/class/mux/muxchip0/ is created: # ls /sys/class/mux/muxchip0/ device of_node power subsystem uevent Sorry for the trivial question, but I haven't found any examples. What is the userspace command if I want to expose "chan3" to be read by the ADC 4 channel? Thanks, Fabio Estevam