From patchwork Wed Jan 18 23:31:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Morgan X-Patchwork-Id: 13107196 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 C452EC38147 for ; Wed, 18 Jan 2023 23:31:48 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A2B0C10E0AD; Wed, 18 Jan 2023 23:31:47 +0000 (UTC) Received: from mail-oi1-x231.google.com (mail-oi1-x231.google.com [IPv6:2607:f8b0:4864:20::231]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0773010E050 for ; Wed, 18 Jan 2023 23:31:45 +0000 (UTC) Received: by mail-oi1-x231.google.com with SMTP id r9so333027oig.12 for ; Wed, 18 Jan 2023 15:31:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; 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=KGfMBl5GE9RGTrpmBtD/eMSnjaklBe1tQxMzM5Zv8cA=; b=HSk34DXM4HMlNtZ4cKEFnLONgd6o1tnbvpeWpngc+WKvXXHULcssTDyH4mBJ5wJ2yk BaunsCO5zhjmM/VXL4VtUcgFdsR7FeUI8e42HjzEiIzmaZN+oUfOs96KcrZCEUk+GI9Y 7TMV9wZxLhsmba43NMR2pQxOeedC8fH6S+lO0LCIOV6VUyYks04UtwIscMY0wdtK87gG +WgWsx9Bjp6in5dWsHcj8T4niuhd4ciyHgpJ+pW2EBhWP2w+pE1yJriEa+wJFcv2d9E5 FOCXM9o6wZ2l+8gZ9gvyDOCdrUTO99auXBd/tUkv7Ai5jj8ihtt8pRpd25GZZaLypRja ie+Q== 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=KGfMBl5GE9RGTrpmBtD/eMSnjaklBe1tQxMzM5Zv8cA=; b=ykAMBut8ibY8SL4OegQTeoj+846qKtHfjvSMubg5Vzu+331OeNdPuOzFhoAtZeyE6r BSzm6qns7Oa4izUhOmgHVFhxGqrsbxBXFMAN98ect/lXYcs2B/ZEttPuyO8krvVul26s kCYOZWault3wz+jE2dmz55mLXAoYhowonJiMx0V8YkVShay5V/TWQSORtclh31iVzpvA TNPbGvNubw1J4g90ieUzNr4khNKMc8W5Uad5aKhtt8EiHN92mpZrXw1nBEjIHXeAPSf/ c+1DkP/YeM0t7No/fCRdnfc6Y2Oe8ELjOh119CzuG5+B1K00VVPJ9UvPRRKdXFVJSe/v LnTg== X-Gm-Message-State: AFqh2krix5vdPjGDrMA7BW16UDD47o/ZZNjTWLb9cWo0r8QaTWLORuIq MDndezTqDqMqCxh17gzFDZhiNTkiJYc= X-Google-Smtp-Source: AMrXdXuf+ZKJEN7IqAh9Nyrm4t+Fq5/ButzdfVgQGQv3cQdSZmzUA9FC1v82rMQXw0Qtq6/mpmSspg== X-Received: by 2002:a54:4789:0:b0:364:5ea0:c3f6 with SMTP id o9-20020a544789000000b003645ea0c3f6mr4123271oic.20.1674084705022; Wed, 18 Jan 2023 15:31:45 -0800 (PST) Received: from localhost.localdomain ([76.244.6.13]) by smtp.gmail.com with ESMTPSA id q10-20020acad90a000000b00354932bae03sm16966933oig.10.2023.01.18.15.31.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jan 2023 15:31:44 -0800 (PST) From: Chris Morgan To: dri-devel@lists.freedesktop.org Subject: [PATCH V11 1/4] drm: of: Add drm_of_get_dsi_bus helper function Date: Wed, 18 Jan 2023 17:31:32 -0600 Message-Id: <20230118233135.1174859-2-macroalpha82@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230118233135.1174859-1-macroalpha82@gmail.com> References: <20230118233135.1174859-1-macroalpha82@gmail.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: devicetree@vger.kernel.org, Chris Morgan , krzysztof.kozlowski+dt@linaro.org, sam@ravnborg.org, linux-rockchip@lists.infradead.org, robh+dt@kernel.org, thierry.reding@gmail.com, tzimmermann@suse.de, Maya Matuszczyk Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Chris Morgan Add helper function to find DSI host for devices where DSI panel is not a minor of a DSI bus (such as the Samsung AMS495QA01 panel or the official Raspberry Pi touchscreen display). Signed-off-by: Chris Morgan Signed-off-by: Maya Matuszczyk --- drivers/gpu/drm/drm_of.c | 51 ++++++++++++++++++++++++++++++++++++++++ include/drm/drm_of.h | 12 ++++++++++ 2 files changed, 63 insertions(+) diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 7bbcb999bb75..177b600895d3 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -493,3 +494,53 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port, return ret; } EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep); + +#if IS_ENABLED(CONFIG_DRM_MIPI_DSI) + +/** + * drm_of_get_dsi_bus - find the DSI bus for a given device + * @dev: parent device of display (SPI, I2C) + * + * Gets parent DSI bus for a DSI device controlled through a bus other + * than MIPI-DCS (SPI, I2C, etc.) using the Device Tree. + * + * Returns pointer to mipi_dsi_host if successful, -EINVAL if the + * request is unsupported, -EPROBE_DEFER if the DSI host is found but + * not available, or -ENODEV otherwise. + */ +struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev) +{ + struct mipi_dsi_host *dsi_host; + struct device_node *endpoint, *dsi_host_node; + + /* + * Get first endpoint child from device. + */ + endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); + if (!endpoint) + return ERR_PTR(-ENODEV); + + /* + * Follow the first endpoint to get the DSI host node and then + * release the endpoint since we no longer need it. + */ + dsi_host_node = of_graph_get_remote_port_parent(endpoint); + of_node_put(endpoint); + if (!dsi_host_node) + return ERR_PTR(-ENODEV); + + /* + * Get the DSI host from the DSI host node. If we get an error + * or the return is null assume we're not ready to probe just + * yet. Release the DSI host node since we're done with it. + */ + dsi_host = of_find_mipi_dsi_host_by_node(dsi_host_node); + of_node_put(dsi_host_node); + if (IS_ERR_OR_NULL(dsi_host)) + return ERR_PTR(-EPROBE_DEFER); + + return dsi_host; +} +EXPORT_SYMBOL_GPL(drm_of_get_dsi_bus); + +#endif /* CONFIG_DRM_MIPI_DSI */ diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index 10ab58c40746..082a6e980d01 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -15,6 +15,8 @@ struct drm_encoder; struct drm_panel; struct drm_bridge; struct device_node; +struct mipi_dsi_device_info; +struct mipi_dsi_host; /** * enum drm_lvds_dual_link_pixels - Pixel order of an LVDS dual-link connection @@ -129,6 +131,16 @@ drm_of_get_data_lanes_count_ep(const struct device_node *port, } #endif +#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_MIPI_DSI) +struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev); +#else +static inline struct +mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev) +{ + return ERR_PTR(-EINVAL); +} +#endif /* CONFIG_OF && CONFIG_DRM_MIPI_DSI */ + /* * drm_of_panel_bridge_remove - remove panel bridge * @np: device tree node containing panel bridge output ports