From patchwork Wed Oct 5 15:13:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 12999373 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 D496DC433FE for ; Wed, 5 Oct 2022 15:14:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 92B5A10E451; Wed, 5 Oct 2022 15:13:38 +0000 (UTC) Received: from mail-io1-xd2f.google.com (mail-io1-xd2f.google.com [IPv6:2607:f8b0:4864:20::d2f]) by gabe.freedesktop.org (Postfix) with ESMTPS id 225F710E118 for ; Wed, 5 Oct 2022 15:13:24 +0000 (UTC) Received: by mail-io1-xd2f.google.com with SMTP id e205so13054855iof.1 for ; Wed, 05 Oct 2022 08:13:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=oZKBZ/Poq4qIDgukJ06pdFkyQHbBE5/VJ3pRiELlmgY=; b=CycY5tvqQX7XlhnNAyQclQ9wN9sBRLKSHjUaZ+2ZIdR47bIf/4sh6oAm0Boem+mxED NwOLrgJEPJ40HVe7uRW5mKdquNOOzm6RBT8u/zYY475ZvWdtNgCp9qIcl0pRk9AJCSEd ZPNC8GOeWscs9RfZyYlOKWnYRfkd4iN779dKU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=oZKBZ/Poq4qIDgukJ06pdFkyQHbBE5/VJ3pRiELlmgY=; b=c/rJRGOIr1OsHRR1Qb+zsigTFTBouw3+zyXvQOqSvXmUhzNTyXVoPIxbHlfbCke/cp ZQqOgK66AgA+lgLNgY1gSvkjtNWyOj6DLJ/NRkUCh5huLpMBhvX74pxG/KWNgnc9rqAZ Ohb0TeMo0W2rqFq2Lky83bSiFD1qBGXKEcks4eHsZMXjHtpMLgsy2rynT5vb8yqsUUCE dhCEQ1nTR8toIhaxegez2ub28A2bcgpuc8jhqVZZlEIdwCAwl3kdCgpZ608UpVE8fFiA wDH7LOz7M2aCdle6eyCEqXeoDveATdLGdzpS3gauyxNSZBKQmlgSv//jmmapE1O99TCl PiZg== X-Gm-Message-State: ACrzQf0bCZdhXNM40Xvb7nwjXvEaJmtqWhzk1N7FnfAC4EUSOg/9Km+x Hg/pmUkLRLgHMK+UGxKV49ki9w== X-Google-Smtp-Source: AMsMyM7+6E9CcbOMePBdcd4NW1DHDNKXHeuu0sWSYmYK93I3b4G0DhEsd2CVNuB3ZL4DZZuGofKtpg== X-Received: by 2002:a02:9f88:0:b0:362:74f6:6215 with SMTP id a8-20020a029f88000000b0036274f66215mr67503jam.2.1664982803307; Wed, 05 Oct 2022 08:13:23 -0700 (PDT) Received: from j-ThinkPad-E14-Gen-2.stthomas.edu ([140.209.96.21]) by smtp.gmail.com with ESMTPSA id w15-20020a056602034f00b0068a235db030sm7089276iou.27.2022.10.05.08.13.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Oct 2022 08:13:22 -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 v7 02/10] drm: bridge: samsung-dsim: Lookup OF-graph or Child node devices Date: Wed, 5 Oct 2022 20:43:01 +0530 Message-Id: <20221005151309.7278-3-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221005151309.7278-1-jagan@amarulasolutions.com> References: <20221005151309.7278-1-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. v7, v6, v5, v4, 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 07563d00a420..c34c6abac815 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -1356,18 +1356,52 @@ 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);