From patchwork Mon Jan 23 15:46:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Morgan X-Patchwork-Id: 646256 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEB2FC54E94 for ; Mon, 23 Jan 2023 15:46:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232714AbjAWPqO (ORCPT ); Mon, 23 Jan 2023 10:46:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52512 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232323AbjAWPqN (ORCPT ); Mon, 23 Jan 2023 10:46:13 -0500 Received: from mail-oi1-x22c.google.com (mail-oi1-x22c.google.com [IPv6:2607:f8b0:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FA235FFD for ; Mon, 23 Jan 2023 07:46:12 -0800 (PST) Received: by mail-oi1-x22c.google.com with SMTP id s66so10701407oib.7 for ; Mon, 23 Jan 2023 07:46:12 -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=KBkAptAOA4H9XjcrGc/btvseom9X4G+qLA3QL8g2pKI=; b=fDnhhB8cv1xJPLetzYQDulSv2MFqG/lR2wj7JKxeqrBsFEITJR3o0xa0KHD84CATy2 j8NuZvIrzHb10BsPkLHa4NdPedviCKorItArzYHXr9BGQkO7jO1KHSbRwBpvKlk1aBsM kP4fUiJYmRCTzyhaouCXkXzThrp1FtHa8psEdP+p5oAMOJ/JfxQGL+paQYF3kf8qpUA2 WnTj+UGgd3HVkejKYYITLuahyKgETGSCZFheegPxjgDqbrOI1EZD896qKpdMjVB25URO 8rRBQqEUyTNjJLKWDeweWSawgKCNQMWLldhcbBEnv63amw0R9umPy5FNTwqbpJnB3dph Fh6w== 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=KBkAptAOA4H9XjcrGc/btvseom9X4G+qLA3QL8g2pKI=; b=QzgUesiQCcrfD6/xLn0CjrWYPsX5W7GHXR0ZMWJQmPgtdEWuqYsW4Jpl6WdKFay8Af N8CKayv0p0gRrWw2QL9RApzAkUSbTHXJrBBXe6OTBHLmUxcc9/C9vyn0m3yYvcoXZzOj pcqlX+H+7Z28NjsOlmSzVce98gK7qFAwU9MCJoHCVHTnnzXIcc9J+8tciTfLejdHj+s/ x8NxeMvGrvZZ99r44J7e8qqwHsVKztKScYOFXHosj3jZrWgoaV3ul2zsarITYKBuZVY5 wtVAd8c1p92kqU9VRUy+VBGKGSXUAIjM6IimkcAsnxLWgKRIFerUQkS1yFs5kIpjdFgS 8rpw== X-Gm-Message-State: AFqh2krIxKz01RuGkrg6Kovke64ndwr9LsnNFRKsir905UvhocGve6zs 6ZGF1xtWQpNdpZmejnJ7/zE= X-Google-Smtp-Source: AMrXdXsBC4Oy9Bs8jiGenaXCp7mThY6PZkscpvG6pBvVAfI/+JZkfZBPLz5nukoV20LWokL1OHMZ+g== X-Received: by 2002:a05:6808:b37:b0:36e:b267:4d16 with SMTP id t23-20020a0568080b3700b0036eb2674d16mr6514849oij.6.1674488771883; Mon, 23 Jan 2023 07:46:11 -0800 (PST) Received: from localhost.localdomain ([76.244.6.13]) by smtp.gmail.com with ESMTPSA id w13-20020a056808140d00b0035e7ed5daa1sm10040132oiv.26.2023.01.23.07.46.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Jan 2023 07:46:11 -0800 (PST) From: Chris Morgan To: dri-devel@lists.freedesktop.org Cc: devicetree@vger.kernel.org, linux-rockchip@lists.infradead.org, tzimmermann@suse.de, mripard@kernel.org, maarten.lankhorst@linux.intel.com, heiko@sntech.de, krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org, daniel@ffwll.ch, airlied@gmail.com, sam@ravnborg.org, thierry.reding@gmail.com, linus.walleij@linaro.org, Chris Morgan , Maya Matuszczyk Subject: [PATCH V12 1/4] drm: of: Add drm_of_get_dsi_bus helper function Date: Mon, 23 Jan 2023 09:46:00 -0600 Message-Id: <20230123154603.1315112-2-macroalpha82@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230123154603.1315112-1-macroalpha82@gmail.com> References: <20230123154603.1315112-1-macroalpha82@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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). Co-developed-by: Maya Matuszczyk Signed-off-by: Maya Matuszczyk Signed-off-by: Chris Morgan Reviewed-by: Maxime Ripard --- 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