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=-16.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_MED,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 91315C04AB5 for ; Tue, 4 Jun 2019 00:32:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 60901252CE for ; Tue, 4 Jun 2019 00:32:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="EqR/6lt+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726686AbfFDAcg (ORCPT ); Mon, 3 Jun 2019 20:32:36 -0400 Received: from mail-pl1-f201.google.com ([209.85.214.201]:44836 "EHLO mail-pl1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726465AbfFDAce (ORCPT ); Mon, 3 Jun 2019 20:32:34 -0400 Received: by mail-pl1-f201.google.com with SMTP id n1so5867392plk.11 for ; Mon, 03 Jun 2019 17:32:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=2KTzGfh7kv2d74sdNHCbcBSbV7diWdzXOMvg7FHNFO4=; b=EqR/6lt+NpIeCzQKsguoNIfebTcbW58o4uF8UjA2VmZtMhVvZq0NCpV2geMVB9IZb8 AqiWkgI+VJ/QGzumXNhOngU3dN4k+xYHwFqyuBFxa2plaPw7Ep/EHRt3KFkOeAbNc1Nd x3j1C6mSwZMLissFCqpR8G8m6f7xPalu8Efd9pe6LUE2zrKOUdltYXQ94aH8x/wKGN1o gQo9ePtghT8W++raYKrkPiX0gpLrC65tiphdmJoeVCpnxr4M8n8SFZK1+LcW+WIMlZEO 3xgANuL+07NGwF/cmTfVuRulDSx+5EjGX5wkkAVUH8bLVnj+9Nhxcs9QMbgNU3Q3AkxM xd1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=2KTzGfh7kv2d74sdNHCbcBSbV7diWdzXOMvg7FHNFO4=; b=QdC62YkyKEayxMpniKswNblEf2N3AY5R99hhpvZ5tzzILsrguIyHk81jeQHR+yI/Af ee6/t1VpiOzkP6/E4la+KfHKBPLkPVnsmbpJ7AOuCzu42tu6RiDTrPkmEwiOmzKJyOoW La66Sk7NLqt6x7XGkhKPIWKR53HB3ksW8oJnAZ4/PyxGRz0WEAyRiGwYPiXvW52AeeTO w3kXYsJl40Tho+lNcvc+xx0XTz0SVJgHjlmlENsI3gUP7MzlNZzPiB0DiGGFvAMQIkXu xbNXDFlWhBm6GqlNAcbQuE6xdxf4Xr/Xi9QQfL04NoR5CweS18KUGvGqf8zgtZHK5rFS FEhw== X-Gm-Message-State: APjAAAXwWXkVAQuhK1xUqJ0ccu02t38wXK8pXK9mgD+MEiXsMvBsqNfC NcjA+D1qc2vqAvis5ZJt7rtmpODlGS86dkI= X-Google-Smtp-Source: APXvYqwmEeWS8ozxJF5RfZj9Gtzd0ufeiTQ52H8arltr4tbYi/DlHHZq9tosKc4KOx47fLR9mK0Rxmw3dZdX6BU= X-Received: by 2002:a63:2d41:: with SMTP id t62mr32132172pgt.113.1559608352800; Mon, 03 Jun 2019 17:32:32 -0700 (PDT) Date: Mon, 3 Jun 2019 17:32:16 -0700 In-Reply-To: <20190604003218.241354-1-saravanak@google.com> Message-Id: <20190604003218.241354-4-saravanak@google.com> Mime-Version: 1.0 References: <20190604003218.241354-1-saravanak@google.com> X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [RESEND PATCH v1 3/5] dt-bindings: Add depends-on property From: Saravana Kannan To: Rob Herring , Mark Rutland , Greg Kroah-Hartman , "Rafael J. Wysocki" , Frank Rowand Cc: Saravana Kannan , David Collins , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The depends-on property is used to list the mandatory functional dependencies of a consumer device on zero or more supplier devices. Signed-off-by: Saravana Kannan --- .../devicetree/bindings/depends-on.txt | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 Documentation/devicetree/bindings/depends-on.txt diff --git a/Documentation/devicetree/bindings/depends-on.txt b/Documentation/devicetree/bindings/depends-on.txt new file mode 100644 index 000000000000..1cbddd11cf17 --- /dev/null +++ b/Documentation/devicetree/bindings/depends-on.txt @@ -0,0 +1,26 @@ +Functional dependency linking +============================= + +Apart from parent-child relationships, devices (consumers) often have +functional dependencies on other devices (suppliers). Common examples of +suppliers are clock, regulators, pinctrl, etc. However not all of them are +dependencies with well defined devicetree bindings. Also, not all functional +dependencies are mandatory as the device might be able to operate in a limited +mode without some of the dependencies. + +The depends-on property allows marking these mandatory functional dependencies +between one or more devices. The depends-on property is used by the consumer +device to point to all its mandatory supplier devices. + +Optional properties: +- depends-on: A list of phandles to mandatory suppliers of the device. + + +Examples: +Here, the device is dependent on only 2 of the 3 clock providers +dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + clocks = <&osc_1 1>, <&osc_2 7> <&osc_3 5>; + depends-on = <&osc_1>, <&osc_3>; +}; -- 2.22.0.rc1.257.g3120a18244-goog