From patchwork Wed Jan 20 11:21:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 368176 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 9FEC6C433E0 for ; Wed, 20 Jan 2021 12:38:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A69723331 for ; Wed, 20 Jan 2021 12:38:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730276AbhATMiZ (ORCPT ); Wed, 20 Jan 2021 07:38:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389436AbhATLYP (ORCPT ); Wed, 20 Jan 2021 06:24:15 -0500 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D687C0613D6 for ; Wed, 20 Jan 2021 03:22:24 -0800 (PST) Received: by mail-pj1-x102c.google.com with SMTP id g15so2008730pjd.2 for ; Wed, 20 Jan 2021 03:22:24 -0800 (PST) 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=TmlonZALpi0ukqLkvV+ibJmp6x1XiVHOCHKougV5iHs=; b=Gk0upiSZj5X3yQHXLETNCfSNqVkyT5K+F7bKLEuG1FyVW5j7ncBDaBfTJg7uzBKYue IjyrVAmZnLI/nuCeGWj5UJmquU7lI1bGTdTeszIQLQIclnyU/PiHAvt3bkTgi1dtA8gO MoKpCQ3PmA7tRLNJn5JNFzeeEIFEkjUPsQzUs= 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=TmlonZALpi0ukqLkvV+ibJmp6x1XiVHOCHKougV5iHs=; b=OBLuA6S4n8/Qqj/KzteBHoXm28wqFt/XHWg8g4FO9+FEeZBiSpkVCvUXwSZN8cN+WT lCjXAnp2E/soOwXrMb6tMUAWGvrs5bh5YsNvpcW+gJAhAK8jgcdffpqLBEXCuWZHlVa0 E7EwQcTj8f4pcf6iX8vBgQ5zYyioCA2YTUPFZkmsHblb3qga66XQbKfd8/4a77nL3INK RYOaM5P/3X73NF1ThMGvCjv9TBhiG4NUP8HgDfrAjYd6rWtYH7jYrV7FLdR9cNQFwshl ISSqx93maPfG+W7WTDkpQ79Z5hpRkLI/Qc3NxujqIsds68ZiKlI9hk1k+zSlIP7VRMMr J97A== X-Gm-Message-State: AOAM533zT0litpWwLUdGEJJsgegUUpOit783AiNi5+hBVo4PAZrger4j oYzV6F3ECmahCcHjj6+Cz9SCgA== X-Google-Smtp-Source: ABdhPJzOHDzf8//jS/8NkfH7tZUszwfQ9VbIf6lN7+/5/K+BDhbZztU+O1nXlMz3T634H4aJhhWfRg== X-Received: by 2002:a17:90a:e393:: with SMTP id b19mr5173443pjz.236.1611141743605; Wed, 20 Jan 2021 03:22:23 -0800 (PST) Received: from ub-XPS-13-9350.domain.name ([103.105.103.154]) by smtp.gmail.com with ESMTPSA id gk2sm2248341pjb.6.2021.01.20.03.22.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jan 2021 03:22:22 -0800 (PST) From: Jagan Teki To: Rob Herring , Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sam Ravnborg Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-amarula@amarulasolutions.com, Jagan Teki , Matteo Lisi Subject: [PATCH 2/2] drm: bridge: Add SN65DSI84 DSI to LVDS bridge Date: Wed, 20 Jan 2021 16:51:58 +0530 Message-Id: <20210120112158.62109-2-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210120112158.62109-1-jagan@amarulasolutions.com> References: <20210120112158.62109-1-jagan@amarulasolutions.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org SN65DSI84 is a Single Channel DSI to Dual-link LVDS bridge from Texas Instruments. SN65DSI83, SN65DSI85 are variants of the same family of bridge controllers. Right now the bridge driver is supporting a single link, dual-link support requires to initiate I2C Channel B registers. Tested with STM32MP1 MIPI DSI host design configuration. Signed-off-by: Matteo Lisi Signed-off-by: Jagan Teki --- MAINTAINERS | 6 + drivers/gpu/drm/bridge/Kconfig | 19 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/ti-sn65dsi84.c | 488 ++++++++++++++++++++++++++ 4 files changed, 514 insertions(+) create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi84.c diff --git a/MAINTAINERS b/MAINTAINERS index 12dd1fff2a39..44750ff7640c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5984,6 +5984,12 @@ S: Maintained F: Documentation/devicetree/bindings/display/ti/ F: drivers/gpu/drm/omapdrm/ +DRM DRIVERS FOR TI SN65DSI84 DSI TO LVDS BRIDGE +M: Jagan Teki +S: Maintained +F: Documentation/devicetree/bindings/display/bridge/ti,sn65dsi84.yaml +F: drivers/gpu/drm/bridge/ti-sn65dsi84.c + DRM DRIVERS FOR V3D M: Eric Anholt S: Supported diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index e4110d6ca7b3..6494881bffb3 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -232,6 +232,25 @@ config DRM_TI_TFP410 help Texas Instruments TFP410 DVI/HDMI Transmitter driver +config DRM_TI_SN65DSI84 + tristate "TI SN65DSI84 DSI to LVDS bridge" + depends on OF + select DRM_KMS_HELPER + select REGMAP_I2C + select DRM_PANEL + select DRM_MIPI_DSI + help + Texas Instruments SN65DSI84 Single Channel DSI to Dual-link LVDS + bridge driver. + + Bridge decodes MIPI DSI 18bpp RGB666 and 240bpp RG888 packets and + converts the formatted video data stream to a FlatLink compatible + LVDS output operating at pixel clocks operating from 25 MHx to + 154 MHz. + + SN65DSI84 offers a Dual-Link LVDS, Single-Link LVDS interface with + four data lanes per link. + config DRM_TI_SN65DSI86 tristate "TI SN65DSI86 DSI to eDP bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 86e7acc76f8d..3906052ef639 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/ +obj-$(CONFIG_DRM_TI_SN65DSI84) += ti-sn65dsi84.o obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi84.c b/drivers/gpu/drm/bridge/ti-sn65dsi84.c new file mode 100644 index 000000000000..3ed1f9a7d898 --- /dev/null +++ b/drivers/gpu/drm/bridge/ti-sn65dsi84.c @@ -0,0 +1,488 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2021 Engicam srl + * Copyright (C) 2021 Amarula Solutions(India) + * Author: Jagan Teki + */ + +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/* sn65dsi84 registers */ +#define SN65DSI_SOFT_RESET 0x09 +#define SN65DSI_LVDS_CLK 0x0a +#define SN65DSI_CLK_DIV 0x0b +#define SN65DSI_CLK_PLL 0x0d +#define SN65DSI_DSI_CFG 0x10 +#define SN65DSI_DSI_CLK_EQ 0x11 +#define SN65DSI_DSI_CLK_RANGE 0x12 +#define SN65DSI_LVDS_MODE 0x18 +#define SN65DSI_CHA_LINE_LO 0x20 +#define SN65DSI_CHA_LINE_HI 0x21 +#define SN65DSI_CHA_VIRT_LO 0x24 +#define SN65DSI_CHA_VIRT_HI 0x25 +#define SN65DSI_CHA_SYNC_DELAY_LO 0x28 +#define SN65DSI_CHA_SYNC_DELAY_HI 0x29 +#define SN65DSI_CHA_HSYNC_WIDTH_LO 0x2c +#define SN65DSI_CHA_HSYNC_WIDTH_HI 0x2d +#define SN65DSI_CHA_VSYNC_WIDTH_LO 0x30 +#define SN65DSI_CHA_VSYNC_WIDTH_HI 0x31 +#define SN65DSI_CHA_HBACK_PORCH 0x34 +#define SN65DSI_CHA_VBACK_PORCH 0x36 +#define SN65DSI_CHA_HFRONT_PORCH 0x38 +#define SN65DSI_CHA_VFRONT_PORCH 0x3a +#define SN65DSI_CHA_ERR 0xe5 + +/* sn65dsi register bits */ +#define SN65DSI_RESET_EN BIT(0) +#define SN65DSI_PLL_EN BIT(0) +#define SN65DSI_LVDS_CLK_MASK GENMASK(3, 1) +#define SN65DSI_LVDS_CLK_SHIFT 1 +#define SN65DSI_LVDS_CLK_SRC_DSI BIT(0) +#define SN65DSI_CLK_DIV_MASK GENMASK(7, 3) +#define SN65DSI_CLK_DIV_SHIFT 3 +#define SN65DSI_DSI_LANE_MASK GENMASK(4, 3) +#define SN65DSI_DSI_LANE_SHIFT 3 +#define SN65DSI_LVDS_LINK_CFG BIT(4) +#define SN65DSI_LVDS_CHA_24BPP BIT(3) +#define SN65DSI_CHA_LOW_SYNC_DELAY 0x20 +#define SN65DSI_CHA_HIGH_SYNC_DELAY 0x00 + +struct sn65dsi { + struct device *dev; + struct drm_bridge bridge; + struct drm_bridge *panel_bridge; + + struct device_node *host_node; + struct mipi_dsi_device *dsi; + u8 dsi_lanes; + + struct regmap *regmap; + struct gpio_desc *enable; +}; + +static const struct regmap_config sn65dsi_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = SN65DSI_CHA_ERR, + .name = "sn65dsi", + .cache_type = REGCACHE_RBTREE, +}; + +static inline struct sn65dsi *bridge_to_sn65dsi(struct drm_bridge *bridge) +{ + return container_of(bridge, struct sn65dsi, bridge); +} + +static struct drm_display_mode *bridge_to_mode(struct drm_bridge *bridge) +{ + return &bridge->encoder->crtc->state->mode; +} + +static void sn65dsi_setup_channels(struct sn65dsi *sn, + struct drm_display_mode *mode) +{ + u32 hsync_len, hfront_porch, hback_porch; + u32 vsync_len, vfront_porch, vback_porch; + + hfront_porch = mode->hsync_start - mode->hdisplay; + hsync_len = mode->hsync_end - mode->hsync_start; + hback_porch = mode->htotal - mode->hsync_end; + + vfront_porch = mode->vsync_start - mode->vdisplay; + vsync_len = mode->vsync_end - mode->vsync_start; + vback_porch = mode->vtotal - mode->vsync_end; + + /* cha, lower 8-bits of hdisplay */ + regmap_write(sn->regmap, SN65DSI_CHA_LINE_LO, mode->hdisplay & 0xff); + + msleep(10); + + /* cha, upper 4-bits of hdisplay */ + regmap_write(sn->regmap, SN65DSI_CHA_LINE_HI, (mode->hdisplay >> 8) & 0xff); + + msleep(10); + + /* cha, lower 8-bits of vdisplay */ + regmap_write(sn->regmap, SN65DSI_CHA_VIRT_LO, mode->vdisplay & 0xff); + + msleep(10); + + /* cha, upper 4-bits of vdisplay */ + regmap_write(sn->regmap, SN65DSI_CHA_VIRT_HI, (mode->vdisplay >> 8) & 0xff); + + msleep(10); + + /*cha, lower sync delay */ + regmap_write(sn->regmap, SN65DSI_CHA_SYNC_DELAY_LO, SN65DSI_CHA_LOW_SYNC_DELAY); + + msleep(10); + + /*cha, upper sync delay */ + regmap_write(sn->regmap, SN65DSI_CHA_SYNC_DELAY_HI, SN65DSI_CHA_HIGH_SYNC_DELAY); + + msleep(10); + + /* cha, lower 8-bits of hsync_len */ + regmap_write(sn->regmap, SN65DSI_CHA_HSYNC_WIDTH_LO, hsync_len & 0xff); + + msleep(10); + + /* cha, upper 2-bits of hsync_len */ + regmap_write(sn->regmap, SN65DSI_CHA_HSYNC_WIDTH_HI, (hsync_len >> 8) & 0xff); + + msleep(10); + + /* cha, lower 8-bits of vsync_len */ + regmap_write(sn->regmap, SN65DSI_CHA_VSYNC_WIDTH_LO, vsync_len & 0xff); + + msleep(10); + + /* cha, upper 2-bits of vsync_len */ + regmap_write(sn->regmap, SN65DSI_CHA_VSYNC_WIDTH_HI, (vsync_len >> 8) & 0xff); + + msleep(10); + + /* cha, hback_porch */ + regmap_write(sn->regmap, SN65DSI_CHA_HBACK_PORCH, hback_porch & 0xff); + + msleep(10); + + /* cha, vback_porch */ + regmap_write(sn->regmap, SN65DSI_CHA_VBACK_PORCH, vback_porch & 0xff); + + msleep(10); + + /* cha, hfront_porch */ + regmap_write(sn->regmap, SN65DSI_CHA_HFRONT_PORCH, hfront_porch & 0xff); + + msleep(10); + + /* cha, vfront_porch */ + regmap_write(sn->regmap, SN65DSI_CHA_VFRONT_PORCH, vfront_porch & 0xff); + + msleep(10); +} + +static int sn65dsi_get_clk_range(int min, int max, unsigned long clock, + unsigned long start, unsigned long diff) +{ + unsigned long next; + int i; + + for (i = min; i <= max; i++) { + next = start + diff; + if (start <= clock && clock < next) + return i; + + start += diff; + } + + return -EINVAL; +} + +static void sn65dsi_enable(struct drm_bridge *bridge) +{ + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); + struct drm_display_mode *mode = bridge_to_mode(bridge); + int bpp = mipi_dsi_pixel_format_to_bpp(sn->dsi->format); + unsigned int lanes = sn->dsi->lanes; + unsigned int pixel_clk = mode->clock * 1000; + unsigned int dsi_clk = pixel_clk * bpp / (lanes * 2); + unsigned int val; + + /* set SOFT_RESET bit */ + regmap_write(sn->regmap, SN65DSI_SOFT_RESET, SN65DSI_RESET_EN); + + msleep(10); + + /* set PLL_EN bit */ + regmap_write(sn->regmap, SN65DSI_CLK_PLL, 0x0); + + msleep(10); + + /* setup lvds clock */ + val = sn65dsi_get_clk_range(0, 5, pixel_clk, 25000000, 25000000); + if (val < 0) { + DRM_DEV_ERROR(sn->dev, "invalid LVDS clock range %d\n", val); + return; + } + + regmap_update_bits(sn->regmap, SN65DSI_LVDS_CLK, + SN65DSI_LVDS_CLK_MASK, + val << SN65DSI_LVDS_CLK_SHIFT); + + regmap_update_bits(sn->regmap, SN65DSI_LVDS_CLK, + SN65DSI_LVDS_CLK_SRC_DSI, + SN65DSI_LVDS_CLK_SRC_DSI); + + msleep(10); + + /* setup bridge clock divider */ + val = (dsi_clk / pixel_clk) - 1; + regmap_update_bits(sn->regmap, SN65DSI_CLK_DIV, + SN65DSI_CLK_DIV_MASK, + val << SN65DSI_CLK_DIV_SHIFT); + msleep(10); + + /* configure dsi */ + regmap_update_bits(sn->regmap, SN65DSI_DSI_CFG, + SN65DSI_DSI_LANE_MASK, + lanes << SN65DSI_DSI_LANE_SHIFT); + msleep(10); + + /* dsi clock range */ + val = sn65dsi_get_clk_range(8, 100, dsi_clk, 40000000, 5000000); + if (val < 0) { + DRM_DEV_ERROR(sn->dev, "invalid DSI clock range %d\n", val); + return; + } + + regmap_write(sn->regmap, SN65DSI_DSI_CLK_RANGE, val); + + msleep(10); + + /* setup lvds channels */ + regmap_read(sn->regmap, SN65DSI_LVDS_MODE, &val); + if (bpp == 24) + val |= SN65DSI_LVDS_CHA_24BPP; + regmap_write(sn->regmap, SN65DSI_LVDS_MODE, val); + + msleep(10); + + /* TODO Channel B required to set up for dual-link LVDS */ + sn65dsi_setup_channels(sn, mode); + + /* set PLL_EN bit */ + regmap_write(sn->regmap, SN65DSI_CLK_PLL, SN65DSI_PLL_EN); + + msleep(10); +} + +static void sn65dsi_disable(struct drm_bridge *bridge) +{ + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); + + /* set PLL_EN bit */ + regmap_write(sn->regmap, SN65DSI_CLK_PLL, 0x0); + + msleep(10); + + /* set SOFT_RESET bit */ + regmap_write(sn->regmap, SN65DSI_SOFT_RESET, 0x0); + + msleep(10); +} + +static void sn65dsi_post_disable(struct drm_bridge *bridge) +{ + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); + + gpiod_set_value_cansleep(sn->enable, 1); + + msleep(10); + + gpiod_set_value_cansleep(sn->enable, 0); + + msleep(10); +} + +static void sn65dsi_pre_enable(struct drm_bridge *bridge) +{ + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); + + gpiod_set_value_cansleep(sn->enable, 0); + + msleep(10); + + gpiod_set_value_cansleep(sn->enable, 1); + + msleep(10); +} + +static int sn65dsi_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) +{ + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); + struct mipi_dsi_host *host; + struct mipi_dsi_device *dsi; + const struct mipi_dsi_device_info info = { .type = "sn65dsi", + .channel = 0, + .node = NULL, + }; + int ret; + + host = of_find_mipi_dsi_host_by_node(sn->host_node); + if (!host) { + DRM_DEV_ERROR(sn->dev, "failed to find dsi host\n"); + return -EPROBE_DEFER; + } + + dsi = mipi_dsi_device_register_full(host, &info); + if (IS_ERR(dsi)) { + DRM_DEV_ERROR(sn->dev, "failed to create dsi device\n"); + return PTR_ERR(sn->dsi); + } + + sn->dsi = dsi; + dsi->lanes = sn->dsi_lanes; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = MIPI_DSI_MODE_VIDEO; + + ret = mipi_dsi_attach(dsi); + if (ret) { + DRM_DEV_ERROR(sn->dev, "failed to attach dsi host\n"); + goto err_dsi_attach; + } + + return drm_bridge_attach(bridge->encoder, sn->panel_bridge, + &sn->bridge, flags); + +err_dsi_attach: + mipi_dsi_device_unregister(dsi); + return ret; +} + +static const struct drm_bridge_funcs sn65dsi_bridge_funcs = { + .attach = sn65dsi_attach, + .pre_enable = sn65dsi_pre_enable, + .enable = sn65dsi_enable, + .disable = sn65dsi_disable, + .post_disable = sn65dsi_post_disable, +}; + +static int sn65dsi_parse_dt(struct sn65dsi *sn) +{ + struct device *dev = sn->dev; + struct device_node *endpoint, *parent; + struct property *prop; + struct drm_panel *panel; + int len = 0; + int ret; + + sn->enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(sn->enable)) { + DRM_DEV_ERROR(dev, "failed to get enable gpio\n"); + return PTR_ERR(sn->enable); + } + + ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); + if (ret < 0) + return ret; + if (!panel) + return -ENODEV; + + sn->panel_bridge = devm_drm_panel_bridge_add(dev, panel); + if (IS_ERR(sn->panel_bridge)) + return PTR_ERR(sn->panel_bridge); + + /* + * To get the data-lanes of dsi, we need to access the port1 of dsi_out + * from the port0 of bridge. + */ + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); + if (endpoint) { + /* dsi_out node */ + parent = of_graph_get_remote_port_parent(endpoint); + of_node_put(endpoint); + if (parent) { + /* dsi port 1 */ + endpoint = of_graph_get_endpoint_by_regs(parent, 1, -1); + of_node_put(parent); + if (endpoint) { + prop = of_find_property(endpoint, "data-lanes", &len); + of_node_put(endpoint); + if (!prop) { + DRM_DEV_ERROR(dev, "failed to find data lane\n"); + return -EPROBE_DEFER; + } + } + } + } + + sn->dsi_lanes = len / sizeof(u32); + if (sn->dsi_lanes < 1 || sn->dsi_lanes > 4) + return -EINVAL; + + sn->host_node = of_graph_get_remote_node(dev->of_node, 0, 0); + if (!sn->host_node) + return -ENODEV; + + of_node_put(sn->host_node); + + return 0; +} + +static int sn65dsi_probe(struct i2c_client *client) +{ + struct sn65dsi *sn; + int ret; + + sn = devm_kzalloc(&client->dev, sizeof(*sn), GFP_KERNEL); + if (!sn) + return -ENOMEM; + + i2c_set_clientdata(client, sn); + sn->dev = &client->dev; + + sn->regmap = devm_regmap_init_i2c(client, &sn65dsi_regmap_config); + if (IS_ERR(sn->regmap)) { + DRM_DEV_ERROR(&client->dev, + "regmap allocation failed (ret = %d)\n", ret); + return PTR_ERR(sn->regmap); + } + + ret = sn65dsi_parse_dt(sn); + if (ret) + return ret; + + sn->bridge.funcs = &sn65dsi_bridge_funcs; + sn->bridge.of_node = client->dev.of_node; + + drm_bridge_add(&sn->bridge); + + return 0; +} + +static int sn65dsi_remove(struct i2c_client *client) +{ + struct sn65dsi *sn = i2c_get_clientdata(client); + + drm_bridge_remove(&sn->bridge); + + return 0; +} + +static struct i2c_device_id sn65dsi_i2c_id[] = { + { "sn65dsi84", 0}, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, sn65dsi_i2c_id); + +static const struct of_device_id sn65dsi_match_table[] = { + {.compatible = "ti,sn65dsi84"}, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sn65dsi_match_table); + +static struct i2c_driver sn65dsi_driver = { + .driver = { + .name = "ti-sn65dsi84", + .of_match_table = sn65dsi_match_table, + }, + .probe_new = sn65dsi_probe, + .remove = sn65dsi_remove, + .id_table = sn65dsi_i2c_id, +}; +module_i2c_driver(sn65dsi_driver); + +MODULE_AUTHOR("Jagan Teki "); +MODULE_DESCRIPTION("SN65DSI84 DSI to LVDS bridge"); +MODULE_LICENSE("GPL v2");