From patchwork Wed Jul 20 15:52:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 12924247 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 4EB07C433EF for ; Wed, 20 Jul 2022 15:52:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6F2D98B6FA; Wed, 20 Jul 2022 15:52:53 +0000 (UTC) Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0DFBF18B715 for ; Wed, 20 Jul 2022 15:52:52 +0000 (UTC) Received: by mail-pf1-x435.google.com with SMTP id o12so16844242pfp.5 for ; Wed, 20 Jul 2022 08:52:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=iLxDXrnWztCpLdw3kYeARw1Pm9i++dE2YdXdMibsoFo=; b=PaszaOkYJY2VE8wDTHuC41WxzfuIzViy7vxpymrOxX5qs1oOeg2km5vr1LjAsFMZhQ uUX9mz9de27WM/nmkjTVMCSKAoQtHBIplBraPHazO3+WrZYhkO7+DF4LoGqWR4XyXVnU QqQBr2ocwiKcKR7L6kEptahnzJucpF6cYoHOM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=iLxDXrnWztCpLdw3kYeARw1Pm9i++dE2YdXdMibsoFo=; b=F9lpzlYZFItRQjz8oCq5STY8g6vix8WDm3J8whXBbr+4tbPqPJiduuNGlz2Rh/yH12 IUbb1l8wdRIoQJ+6SBoQfcdyxF6OkJAqcxT06aL8c1c+cV+f7AgGe7aULayjQFux11H7 Y0F+ozyHznDi313fJgDONRiOoUPSNrLl5PCVqakQsF72B4QLgeX6gT1bi4pgWtRqzOjN OgkMOHhjSqtwiO1/yUf5dw5hWKJK4O2GSrdla6YB1+MLYH+SGJRnS30XSBkRsKJDxvTW s4Pu/YvyAo1YFcON42LYKadaryNUHT5nsRyvc4EwYvcPELBdRQqhC27E3//qG9N/Z4q5 Gd3Q== X-Gm-Message-State: AJIora8V18RE8ol+awo2IfXakrGVT5a/3Nt08958YB46ICPrsnF2sTfu Ij0jnYxjCAjHnvWEsPpF5wyhpw== X-Google-Smtp-Source: AGRyM1uNAIpZRc81rmpXpMq/eT86B354GywhhPmppJYXQAqiCpFr4SAfCAr2HROsR5Et4FZ52w7r5A== X-Received: by 2002:a63:8841:0:b0:412:b40b:cfb5 with SMTP id l62-20020a638841000000b00412b40bcfb5mr35384538pgd.197.1658332371457; Wed, 20 Jul 2022 08:52:51 -0700 (PDT) Received: from localhost.localdomain ([2405:201:c00a:a073:d177:d5:aee:4f03]) by smtp.gmail.com with ESMTPSA id a8-20020a170902710800b0015e8d4eb1d7sm13919198pll.33.2022.07.20.08.52.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jul 2022 08:52:51 -0700 (PDT) From: Jagan Teki To: Andrzej Hajda , Inki Dae , Marek Szyprowski , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Frieder Schrempf , Fancy Fang , Tim Harvey , Michael Nazzareno Trimarchi , Adam Ford , Neil Armstrong , Robert Foss , Laurent Pinchart , Tommaso Merciai , Marek Vasut Subject: [PATCH v3 03/13] drm: bridge: samsung-dsim: Lookup OF-graph or Child node devices Date: Wed, 20 Jul 2022 21:22:00 +0530 Message-Id: <20220720155210.365977-4-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220720155210.365977-1-jagan@amarulasolutions.com> References: <20220720155210.365977-1-jagan@amarulasolutions.com> MIME-Version: 1.0 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: linux-samsung-soc@vger.kernel.org, Matteo Lisi , dri-devel@lists.freedesktop.org, NXP Linux Team , linux-amarula , linux-arm-kernel@lists.infradead.org, Jagan Teki Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The child devices in MIPI DSI can be binding with OF-graph and also via child nodes. The OF-graph interface represents the child devices via remote and associated endpoint numbers like dsi { compatible = "fsl,imx8mm-mipi-dsim"; ports { port@0 { reg = <0>; dsi_in_lcdif: endpoint@0 { reg = <0>; remote-endpoint = <&lcdif_out_dsi>; }; }; port@1 { reg = <1>; dsi_out_bridge: endpoint { remote-endpoint = <&bridge_in_dsi>; }; }; }; The child node interface represents the child devices via conventional child nodes on given DSI parent like dsi { compatible = "samsung,exynos5433-mipi-dsi"; ports { port@0 { reg = <0>; dsi_to_mic: endpoint { remote-endpoint = <&mic_to_dsi>; }; }; }; panel@0 { reg = <0>; }; }; As Samsung DSIM bridge is common DSI IP across all Exynos DSI and NXP i.MX8M host controllers, this patch adds support to lookup the child devices whether its bindings on the associated host represent OF-graph or child node interfaces. v3: * none v2: * new patch Signed-off-by: Jagan Teki --- drivers/gpu/drm/bridge/samsung-dsim.c | 38 +++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index 21975ed513bd..20db345abf8b 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -1357,18 +1357,52 @@ static int samsung_dsim_host_attach(struct mipi_dsi_host *host, struct samsung_dsim *dsi = host_to_dsi(host); const struct samsung_dsim_plat_data *pdata = dsi->plat_data; struct device *dev = dsi->dev; + struct device_node *np = dev->of_node; + struct device_node *remote; struct drm_panel *panel; int ret; - panel = of_drm_find_panel(device->dev.of_node); + /** + * Devices can also be child nodes when we also control that device + * through the upstream device (ie, MIPI-DCS for a MIPI-DSI device). + * + * Lookup for a child node of the given parent that isn't either port + * or ports. + */ + for_each_available_child_of_node(np, remote) { + if (of_node_name_eq(remote, "port") || + of_node_name_eq(remote, "ports")) + continue; + + goto of_find_panel_or_bridge; + } + + /* + * of_graph_get_remote_node() produces a noisy error message if port + * node isn't found and the absence of the port is a legit case here, + * so at first we silently check whether graph presents in the + * device-tree node. + */ + if (!of_graph_is_present(np)) + return -ENODEV; + + remote = of_graph_get_remote_node(np, 1, 0); + +of_find_panel_or_bridge: + if (!remote) + return -ENODEV; + + panel = of_drm_find_panel(remote); if (!IS_ERR(panel)) { dsi->out_bridge = devm_drm_panel_bridge_add(dev, panel); } else { - dsi->out_bridge = of_drm_find_bridge(device->dev.of_node); + dsi->out_bridge = of_drm_find_bridge(remote); if (!dsi->out_bridge) dsi->out_bridge = ERR_PTR(-EINVAL); } + of_node_put(remote); + if (IS_ERR(dsi->out_bridge)) { ret = PTR_ERR(dsi->out_bridge); DRM_DEV_ERROR(dev, "failed to find the bridge: %d\n", ret);