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=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 1B0F7C47084 for ; Tue, 25 May 2021 00:02:44 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D7A706141F for ; Tue, 25 May 2021 00:02:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D7A706141F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1FE706E44E; Tue, 25 May 2021 00:02:41 +0000 (UTC) Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by gabe.freedesktop.org (Postfix) with ESMTPS id 374916E44E for ; Tue, 25 May 2021 00:02:38 +0000 (UTC) Received: by mail-pf1-x434.google.com with SMTP id q25so4126985pfn.1 for ; Mon, 24 May 2021 17:02:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=W6ypAeNUyTw13+ot10ZJQCb7zwm92rirhMuMnGlmdIU=; b=FFPgxCLKPIvWnLs03iIgcyr6GE8zQUZQ8sRvcNzu/YD7cj4TPN4zWLQ3tH6so65zkb vJQaqSDWEWJD9nuU1vz0F+NdT65YWQM54V+JBtu3Ft2hIkfFeseFYai001oLOoRBfQ1F yreunhpuNrtcArkMUGoQaiZc8CD5Gi/QCl/ko= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=W6ypAeNUyTw13+ot10ZJQCb7zwm92rirhMuMnGlmdIU=; b=EsC/sc/wLdXbNjQfhDO2FXYn3woKWKAwtB66N6Mg/yI+1tgNWBU9kljc4e7Y5rfqUr oX8l96IeVlrF3+tMxiPRYWEWfB/RWOSxftgvTZVv5esYhFTfQca7cNgxJCpZAzMntBly Hkjc0Mi0VkbP3xLn8RIYtBTAtvcT9xssOFTS/ob+6ZY5KQB8WlNNTFGIK/t/69V/i6+L 4sun0JMKmfRuXauikcdGoJB6vTXOQGAF0fwSxWN4Z3YCUKissSoE0cE8a6ObLxlz0axM L+0es57v9lophiCCxuQpWyyMUR84qjy9fZc9Pj2977OJICG9LrAzPesonFqE7rDEj30N HRrQ== X-Gm-Message-State: AOAM533CJmLsDex3oopDE5754z47h7NbwgHVEGlIQfs3vRBPMe0tkDHs qaK3inrhl/zMAV1wwTCcwAfJCQ== X-Google-Smtp-Source: ABdhPJz+LC13pDsPvIBJY/vfn0G6QTA8D2JN1gmx11Mo7iFbBxGuzCfte4L/NJ0jWk9GQJjvTVI8vw== X-Received: by 2002:aa7:8556:0:b029:2e2:45aa:d01e with SMTP id y22-20020aa785560000b02902e245aad01emr25395634pfn.14.1621900957855; Mon, 24 May 2021 17:02:37 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:26d1:4df0:7cdf:ce13]) by smtp.gmail.com with ESMTPSA id f18sm10696741pjh.55.2021.05.24.17.02.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 May 2021 17:02:37 -0700 (PDT) From: Douglas Anderson To: Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Sam Ravnborg Subject: [PATCH v8 01/11] dt-bindings: display: simple: List hpd properties in panel-simple Date: Mon, 24 May 2021 17:01:49 -0700 Message-Id: <20210524165920.v8.1.Ieb731d23680db4700cc41fe51ccc73ba0b785fb7@changeid> X-Mailer: git-send-email 2.31.1.818.g46aad6cb9e-goog In-Reply-To: <20210525000159.3384921-1-dianders@chromium.org> References: <20210525000159.3384921-1-dianders@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robdclark@chromium.org, devicetree@vger.kernel.org, David Airlie , linux-arm-msm@vger.kernel.org, Douglas Anderson , Steev Klimaszewski , Bjorn Andersson , Stanislav Lisovskiy , Rob Herring , Thierry Reding , dri-devel@lists.freedesktop.org, Stephen Boyd , Thierry Reding , linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The HPD (Hot Plug Detect) signal is present in many (probably even "most") eDP panels. For eDP, this signal isn't actually used for detecting hot-plugs of the panel but is more akin to a "panel ready" signal. After you provide power to the panel, panel timing diagrams typically say that you should wait for HPD to be asserted (or wait a fixed amount of time) before talking to the panel. The panel-simple bindings describes many eDP panels and many of these panels provide the HPD signal. We should add the HPD-related properties to the panel-simple bindings. The HPD properties are actually defined in panel-common.yaml, so adding them here just documents that they are OK for panels handled by the panel-simple bindings. NOTE: whether or not we'd include HPD properties in the panel node is more a property of the board design than the panel itself. For most boards using these eDP panels everything "magically" works without specifying any HPD properties and that's been why we haven't needed to allow the HPD properties earlier. On these boards the HPD signal goes directly to a dedicated "HPD" input to the eDP controller and this connection doesn't need to be described in the device tree. The only time the HPD properties are needed in the device tree are if HPD is hooked up to a GPIO or if HPD is normally on the panel but isn't used on a given board. That means that if we don't allow the HPD properties in panel-simple then one could argue that we've got to boot all eDP panels (or at least all those that someone could conceivably put on a system where HPD goes to a GPIO or isn't hooked up) from panel-simple. Signed-off-by: Douglas Anderson --- Changes in v8: - Explain better why HPD needs to be in panel-simple in commit msg. Changes in v7: - List hpd properties bindings patch new for v7. .../devicetree/bindings/display/panel/panel-simple.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml index b3797ba2698b..4a0a5e1ee252 100644 --- a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml +++ b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml @@ -298,6 +298,8 @@ properties: enable-gpios: true port: true power-supply: true + no-hpd: true + hpd-gpios: true additionalProperties: false -- 2.31.1.818.g46aad6cb9e-goog