text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   * Author:
   *      Mark Yao <mark.yao@rock-chips.com>
   *      Sandy Huang <hjc@rock-chips.com>
   */
  
  #include <linux/clk.h>
  #include <linux/component.h>
  #include <linux/mfd/syscon.h>
  #include <linux/of_graph.h>
  #include <linux/phy/phy.h>
  #include <linux/pinctrl/devinfo.h>
  #include <linux/platform_device.h>
  #include <linux/pm_runtime.h>
  #include <linux/regmap.h>
  #include <linux/reset.h>
  #include <drm/drm_atomic_helper.h>
  #include <drm/drm_bridge.h>
  
  #include <drm/drm_dp_helper.h>
  #include <drm/drm_of.h>
  #include <drm/drm_panel.h>
  #include <drm/drm_probe_helper.h>
  
  #include "rockchip_drm_drv.h"
  #include "rockchip_drm_vop.h"
  #include "rockchip_lvds.h"
  
  #define DISPLAY_OUTPUT_RGB		0
  #define DISPLAY_OUTPUT_LVDS		1
  #define DISPLAY_OUTPUT_DUAL_LVDS	2
  
  struct rockchip_lvds;
  
  #define connector_to_lvds(c) \
  		container_of(c, struct rockchip_lvds, connector)
  
  #define encoder_to_lvds(c) \
  		container_of(c, struct rockchip_lvds, encoder)
  
  /**
   * rockchip_lvds_soc_data - rockchip lvds Soc private data
   * @probe: LVDS platform probe function
   * @helper_funcs: LVDS connector helper functions
   */
  struct rockchip_lvds_soc_data {
  	int (*probe)(struct platform_device *pdev, struct rockchip_lvds *lvds);
  	const struct drm_encoder_helper_funcs *helper_funcs;
  };
  
  struct rockchip_lvds {
  	struct device *dev;
  	void __iomem *regs;
  	struct regmap *grf;
  	struct clk *pclk;
  	struct phy *dphy;
  	const struct rockchip_lvds_soc_data *soc_data;
  	int output; /* rgb lvds or dual lvds output */
  	int format; /* vesa or jeida format */
  	struct drm_device *drm_dev;
  	struct drm_panel *panel;
  	struct drm_bridge *bridge;
  	struct drm_connector connector;
  	struct drm_encoder encoder;
  	struct dev_pin_info *pins;
  };
  
  static inline void rk3288_writel(struct rockchip_lvds *lvds, u32 offset,
  				 u32 val)
  {
  	writel_relaxed(val, lvds->regs + offset);
  	if (lvds->output == DISPLAY_OUTPUT_LVDS)
  		return;
  	writel_relaxed(val, lvds->regs + offset + RK3288_LVDS_CH1_OFFSET);
  }
  
  static inline int rockchip_lvds_name_to_format(const char *s)
  {
  	if (strncmp(s, "jeida-18", 8) == 0)
  		return LVDS_JEIDA_18;
  	else if (strncmp(s, "jeida-24", 8) == 0)
  		return LVDS_JEIDA_24;
  	else if (strncmp(s, "vesa-24", 7) == 0)
  		return LVDS_VESA_24;
  
  	return -EINVAL;
  }
  
  static inline int rockchip_lvds_name_to_output(const char *s)
  {
  	if (strncmp(s, "rgb", 3) == 0)
  		return DISPLAY_OUTPUT_RGB;
  	else if (strncmp(s, "lvds", 4) == 0)
  		return DISPLAY_OUTPUT_LVDS;
  	else if (strncmp(s, "duallvds", 8) == 0)
  		return DISPLAY_OUTPUT_DUAL_LVDS;
  
  	return -EINVAL;
  }
  
  static const struct drm_connector_funcs rockchip_lvds_connector_funcs = {
  	.fill_modes = drm_helper_probe_single_connector_modes,
  	.destroy = drm_connector_cleanup,
  	.reset = drm_atomic_helper_connector_reset,
  	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  };
  
  static int rockchip_lvds_connector_get_modes(struct drm_connector *connector)
  {
  	struct rockchip_lvds *lvds = connector_to_lvds(connector);
  	struct drm_panel *panel = lvds->panel;
  
  	return drm_panel_get_modes(panel, connector);
  }
  
  static const
  struct drm_connector_helper_funcs rockchip_lvds_connector_helper_funcs = {
  	.get_modes = rockchip_lvds_connector_get_modes,
  };
  
  static int
  rockchip_lvds_encoder_atomic_check(struct drm_encoder *encoder,
  				   struct drm_crtc_state *crtc_state,
  				   struct drm_connector_state *conn_state)
  {
  	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
  
  	s->output_mode = ROCKCHIP_OUT_MODE_P888;
  	s->output_type = DRM_MODE_CONNECTOR_LVDS;
  
  	return 0;
  }
  
  static int rk3288_lvds_poweron(struct rockchip_lvds *lvds)
  {
  	int ret;
  	u32 val;
  
  	ret = clk_enable(lvds->pclk);
  	if (ret < 0) {
  		DRM_DEV_ERROR(lvds->dev, "failed to enable lvds pclk %d\n", ret);
  		return ret;
  	}
  	ret = pm_runtime_get_sync(lvds->dev);
  	if (ret < 0) {
  		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
  		clk_disable(lvds->pclk);
  		return ret;
  	}
  	val = RK3288_LVDS_CH0_REG0_LANE4_EN | RK3288_LVDS_CH0_REG0_LANE3_EN |
  		RK3288_LVDS_CH0_REG0_LANE2_EN | RK3288_LVDS_CH0_REG0_LANE1_EN |
  		RK3288_LVDS_CH0_REG0_LANE0_EN;
  	if (lvds->output == DISPLAY_OUTPUT_RGB) {
  		val |= RK3288_LVDS_CH0_REG0_TTL_EN |
  			RK3288_LVDS_CH0_REG0_LANECK_EN;
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG0, val);
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG2,
  			      RK3288_LVDS_PLL_FBDIV_REG2(0x46));
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG4,
  			      RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE |
  			      RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE |
  			      RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE |
  			      RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE |
  			      RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE |
  			      RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE);
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG5,
  			      RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA |
  			      RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA |
  			      RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA |
  			      RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA |
  			      RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA |
  			      RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA);
  	} else {
  		val |= RK3288_LVDS_CH0_REG0_LVDS_EN |
  			    RK3288_LVDS_CH0_REG0_LANECK_EN;
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG0, val);
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG1,
  			      RK3288_LVDS_CH0_REG1_LANECK_BIAS |
  			      RK3288_LVDS_CH0_REG1_LANE4_BIAS |
  			      RK3288_LVDS_CH0_REG1_LANE3_BIAS |
  			      RK3288_LVDS_CH0_REG1_LANE2_BIAS |
  			      RK3288_LVDS_CH0_REG1_LANE1_BIAS |
  			      RK3288_LVDS_CH0_REG1_LANE0_BIAS);
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG2,
  			      RK3288_LVDS_CH0_REG2_RESERVE_ON |
  			      RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE |
  			      RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE |
  			      RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE |
  			      RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE |
  			      RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE |
  			      RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE |
  			      RK3288_LVDS_PLL_FBDIV_REG2(0x46));
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG4, 0x00);
  		rk3288_writel(lvds, RK3288_LVDS_CH0_REG5, 0x00);
  	}
  	rk3288_writel(lvds, RK3288_LVDS_CH0_REG3,
  		      RK3288_LVDS_PLL_FBDIV_REG3(0x46));
  	rk3288_writel(lvds, RK3288_LVDS_CH0_REGD,
  		      RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
  	rk3288_writel(lvds, RK3288_LVDS_CH0_REG20,
  		      RK3288_LVDS_CH0_REG20_LSB);
  
  	rk3288_writel(lvds, RK3288_LVDS_CFG_REGC,
  		      RK3288_LVDS_CFG_REGC_PLL_ENABLE);
  	rk3288_writel(lvds, RK3288_LVDS_CFG_REG21,
  		      RK3288_LVDS_CFG_REG21_TX_ENABLE);
  
  	return 0;
  }
  
  static void rk3288_lvds_poweroff(struct rockchip_lvds *lvds)
  {
  	int ret;
  	u32 val;
  
  	rk3288_writel(lvds, RK3288_LVDS_CFG_REG21,
  		      RK3288_LVDS_CFG_REG21_TX_ENABLE);
  	rk3288_writel(lvds, RK3288_LVDS_CFG_REGC,
  		      RK3288_LVDS_CFG_REGC_PLL_ENABLE);
  	val = LVDS_DUAL | LVDS_TTL_EN | LVDS_CH0_EN | LVDS_CH1_EN | LVDS_PWRDN;
  	val |= val << 16;
  	ret = regmap_write(lvds->grf, RK3288_LVDS_GRF_SOC_CON7, val);
  	if (ret != 0)
  		DRM_DEV_ERROR(lvds->dev, "Could not write to GRF: %d\n", ret);
  
  	pm_runtime_put(lvds->dev);
  	clk_disable(lvds->pclk);
  }
  
  static int rk3288_lvds_grf_config(struct drm_encoder *encoder,
  				  struct drm_display_mode *mode)
  {
  	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
  	u8 pin_hsync = (mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
  	u8 pin_dclk = (mode->flags & DRM_MODE_FLAG_PCSYNC) ? 1 : 0;
  	u32 val;
  	int ret;
  
  	/* iomux to LCD data/sync mode */
  	if (lvds->output == DISPLAY_OUTPUT_RGB)
  		if (lvds->pins && !IS_ERR(lvds->pins->default_state))
  			pinctrl_select_state(lvds->pins->p,
  					     lvds->pins->default_state);
  	val = lvds->format | LVDS_CH0_EN;
  	if (lvds->output == DISPLAY_OUTPUT_RGB)
  		val |= LVDS_TTL_EN | LVDS_CH1_EN;
  	else if (lvds->output == DISPLAY_OUTPUT_DUAL_LVDS)
  		val |= LVDS_DUAL | LVDS_CH1_EN;
  
  	if ((mode->htotal - mode->hsync_start) & 0x01)
  		val |= LVDS_START_PHASE_RST_1;
  
  	val |= (pin_dclk << 8) | (pin_hsync << 9);
  	val |= (0xffff << 16);
  	ret = regmap_write(lvds->grf, RK3288_LVDS_GRF_SOC_CON7, val);
  	if (ret)
  		DRM_DEV_ERROR(lvds->dev, "Could not write to GRF: %d\n", ret);
  
  	return ret;
  }
  
  static int rk3288_lvds_set_vop_source(struct rockchip_lvds *lvds,
  				      struct drm_encoder *encoder)
  {
  	u32 val;
  	int ret;
  
  	ret = drm_of_encoder_active_endpoint_id(lvds->dev->of_node, encoder);
  	if (ret < 0)
  		return ret;
  
  	val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
  	if (ret)
  		val |= RK3288_LVDS_SOC_CON6_SEL_VOP_LIT;
  
  	ret = regmap_write(lvds->grf, RK3288_LVDS_GRF_SOC_CON6, val);
  	if (ret < 0)
  		return ret;
  
  	return 0;
  }
  
  static void rk3288_lvds_encoder_enable(struct drm_encoder *encoder)
  {
  	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
  	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
  	int ret;
  
  	drm_panel_prepare(lvds->panel);
  
  	ret = rk3288_lvds_poweron(lvds);
  	if (ret < 0) {
  		DRM_DEV_ERROR(lvds->dev, "failed to power on LVDS: %d\n", ret);
  		drm_panel_unprepare(lvds->panel);
  		return;
  	}
  
  	ret = rk3288_lvds_grf_config(encoder, mode);
  	if (ret) {
  		DRM_DEV_ERROR(lvds->dev, "failed to configure LVDS: %d\n", ret);
  		drm_panel_unprepare(lvds->panel);
  		return;
  	}
  
  	ret = rk3288_lvds_set_vop_source(lvds, encoder);
  	if (ret) {
  		DRM_DEV_ERROR(lvds->dev, "failed to set VOP source: %d\n", ret);
  		drm_panel_unprepare(lvds->panel);
  		return;
  	}
  
  	drm_panel_enable(lvds->panel);
  }
  
  static void rk3288_lvds_encoder_disable(struct drm_encoder *encoder)
  {
  	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
  
  	drm_panel_disable(lvds->panel);
  	rk3288_lvds_poweroff(lvds);
  	drm_panel_unprepare(lvds->panel);
  }
  
  static int px30_lvds_poweron(struct rockchip_lvds *lvds)
  {
  	int ret;
  
  	ret = pm_runtime_get_sync(lvds->dev);
  	if (ret < 0) {
  		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
  		return ret;
  	}
  
  	/* Enable LVDS mode */
  	return regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
  				  PX30_LVDS_MODE_EN(1) | PX30_LVDS_P2S_EN(1),
  				  PX30_LVDS_MODE_EN(1) | PX30_LVDS_P2S_EN(1));
  }
  
  static void px30_lvds_poweroff(struct rockchip_lvds *lvds)
  {
  	regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
  			   PX30_LVDS_MODE_EN(1) | PX30_LVDS_P2S_EN(1),
  			   PX30_LVDS_MODE_EN(0) | PX30_LVDS_P2S_EN(0));
  
  	pm_runtime_put(lvds->dev);
  }
  
  static int px30_lvds_grf_config(struct drm_encoder *encoder,
  				struct drm_display_mode *mode)
  {
  	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
  
  	if (lvds->output != DISPLAY_OUTPUT_LVDS) {
  		DRM_DEV_ERROR(lvds->dev, "Unsupported display output %d\n",
  			      lvds->output);
  		return -EINVAL;
  	}
  
  	/* Set format */
  	return regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
  				  PX30_LVDS_FORMAT(lvds->format),
  				  PX30_LVDS_FORMAT(lvds->format));
  }
  
  static int px30_lvds_set_vop_source(struct rockchip_lvds *lvds,
  				    struct drm_encoder *encoder)
  {
  	int vop;
  
  	vop = drm_of_encoder_active_endpoint_id(lvds->dev->of_node, encoder);
  	if (vop < 0)
  		return vop;
  
  	return regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
  				  PX30_LVDS_VOP_SEL(1),
  				  PX30_LVDS_VOP_SEL(vop));
  }
  
  static void px30_lvds_encoder_enable(struct drm_encoder *encoder)
  {
  	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
  	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
  	int ret;
  
  	drm_panel_prepare(lvds->panel);
  
  	ret = px30_lvds_poweron(lvds);
  	if (ret) {
  		DRM_DEV_ERROR(lvds->dev, "failed to power on LVDS: %d\n", ret);
  		drm_panel_unprepare(lvds->panel);
  		return;
  	}
  
  	ret = px30_lvds_grf_config(encoder, mode);
  	if (ret) {
  		DRM_DEV_ERROR(lvds->dev, "failed to configure LVDS: %d\n", ret);
  		drm_panel_unprepare(lvds->panel);
  		return;
  	}
  
  	ret = px30_lvds_set_vop_source(lvds, encoder);
  	if (ret) {
  		DRM_DEV_ERROR(lvds->dev, "failed to set VOP source: %d\n", ret);
  		drm_panel_unprepare(lvds->panel);
  		return;
  	}
  
  	drm_panel_enable(lvds->panel);
  }
  
  static void px30_lvds_encoder_disable(struct drm_encoder *encoder)
  {
  	struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
  
  	drm_panel_disable(lvds->panel);
  	px30_lvds_poweroff(lvds);
  	drm_panel_unprepare(lvds->panel);
  }
  
  static const
  struct drm_encoder_helper_funcs rk3288_lvds_encoder_helper_funcs = {
  	.enable = rk3288_lvds_encoder_enable,
  	.disable = rk3288_lvds_encoder_disable,
  	.atomic_check = rockchip_lvds_encoder_atomic_check,
  };
  
  static const
  struct drm_encoder_helper_funcs px30_lvds_encoder_helper_funcs = {
  	.enable = px30_lvds_encoder_enable,
  	.disable = px30_lvds_encoder_disable,
  	.atomic_check = rockchip_lvds_encoder_atomic_check,
  };
  
  static const struct drm_encoder_funcs rockchip_lvds_encoder_funcs = {
  	.destroy = drm_encoder_cleanup,
  };
  
  static int rk3288_lvds_probe(struct platform_device *pdev,
  			     struct rockchip_lvds *lvds)
  {
  	struct resource *res;
  	int ret;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	lvds->regs = devm_ioremap_resource(lvds->dev, res);
  	if (IS_ERR(lvds->regs))
  		return PTR_ERR(lvds->regs);
  
  	lvds->pclk = devm_clk_get(lvds->dev, "pclk_lvds");
  	if (IS_ERR(lvds->pclk)) {
  		DRM_DEV_ERROR(lvds->dev, "could not get pclk_lvds\n");
  		return PTR_ERR(lvds->pclk);
  	}
  
  	lvds->pins = devm_kzalloc(lvds->dev, sizeof(*lvds->pins),
  				  GFP_KERNEL);
  	if (!lvds->pins)
  		return -ENOMEM;
  
  	lvds->pins->p = devm_pinctrl_get(lvds->dev);
  	if (IS_ERR(lvds->pins->p)) {
  		DRM_DEV_ERROR(lvds->dev, "no pinctrl handle\n");
  		devm_kfree(lvds->dev, lvds->pins);
  		lvds->pins = NULL;
  	} else {
  		lvds->pins->default_state =
  			pinctrl_lookup_state(lvds->pins->p, "lcdc");
  		if (IS_ERR(lvds->pins->default_state)) {
  			DRM_DEV_ERROR(lvds->dev, "no default pinctrl state\n");
  			devm_kfree(lvds->dev, lvds->pins);
  			lvds->pins = NULL;
  		}
  	}
  
  	ret = clk_prepare(lvds->pclk);
  	if (ret < 0) {
  		DRM_DEV_ERROR(lvds->dev, "failed to prepare pclk_lvds\n");
  		return ret;
  	}
  
  	return 0;
  }
  
  static int px30_lvds_probe(struct platform_device *pdev,
  			   struct rockchip_lvds *lvds)
  {
  	int ret;
  
  	/* MSB */
  	ret =  regmap_update_bits(lvds->grf, PX30_LVDS_GRF_PD_VO_CON1,
  				  PX30_LVDS_MSBSEL(1),
  				  PX30_LVDS_MSBSEL(1));
  	if (ret)
  		return ret;
  
  	/* PHY */
  	lvds->dphy = devm_phy_get(&pdev->dev, "dphy");
  	if (IS_ERR(lvds->dphy))
  		return PTR_ERR(lvds->dphy);
  
  	phy_init(lvds->dphy);
  	if (ret)
  		return ret;
  
  	phy_set_mode(lvds->dphy, PHY_MODE_LVDS);
  	if (ret)
  		return ret;
  
  	return phy_power_on(lvds->dphy);
  }
  
  static const struct rockchip_lvds_soc_data rk3288_lvds_data = {
  	.probe = rk3288_lvds_probe,
  	.helper_funcs = &rk3288_lvds_encoder_helper_funcs,
  };
  
  static const struct rockchip_lvds_soc_data px30_lvds_data = {
  	.probe = px30_lvds_probe,
  	.helper_funcs = &px30_lvds_encoder_helper_funcs,
  };
  
  static const struct of_device_id rockchip_lvds_dt_ids[] = {
  	{
  		.compatible = "rockchip,rk3288-lvds",
  		.data = &rk3288_lvds_data
  	},
  	{
  		.compatible = "rockchip,px30-lvds",
  		.data = &px30_lvds_data
  	},
  	{}
  };
  MODULE_DEVICE_TABLE(of, rockchip_lvds_dt_ids);
  
  static int rockchip_lvds_bind(struct device *dev, struct device *master,
  			      void *data)
  {
  	struct rockchip_lvds *lvds = dev_get_drvdata(dev);
  	struct drm_device *drm_dev = data;
  	struct drm_encoder *encoder;
  	struct drm_connector *connector;
  	struct device_node *remote = NULL;
  	struct device_node  *port, *endpoint;
  	int ret = 0, child_count = 0;
  	const char *name;
  	u32 endpoint_id;
  
  	lvds->drm_dev = drm_dev;
  	port = of_graph_get_port_by_id(dev->of_node, 1);
  	if (!port) {
  		DRM_DEV_ERROR(dev,
  			      "can't found port point, please init lvds panel port!\n");
  		return -EINVAL;
  	}
  	for_each_child_of_node(port, endpoint) {
  		child_count++;
  		of_property_read_u32(endpoint, "reg", &endpoint_id);
  		ret = drm_of_find_panel_or_bridge(dev->of_node, 1, endpoint_id,
  						  &lvds->panel, &lvds->bridge);
  		if (!ret) {
  			of_node_put(endpoint);
  			break;
  		}
  	}
  	if (!child_count) {
  		DRM_DEV_ERROR(dev, "lvds port does not have any children\n");
  		ret = -EINVAL;
  		goto err_put_port;
  	} else if (ret) {
  		DRM_DEV_ERROR(dev, "failed to find panel and bridge node\n");
  		ret = -EPROBE_DEFER;
  		goto err_put_port;
  	}
  	if (lvds->panel)
  		remote = lvds->panel->dev->of_node;
  	else
  		remote = lvds->bridge->of_node;
  	if (of_property_read_string(dev->of_node, "rockchip,output", &name))
  		/* default set it as output rgb */
  		lvds->output = DISPLAY_OUTPUT_RGB;
  	else
  		lvds->output = rockchip_lvds_name_to_output(name);
  
  	if (lvds->output < 0) {
  		DRM_DEV_ERROR(dev, "invalid output type [%s]\n", name);
  		ret = lvds->output;
  		goto err_put_remote;
  	}
  
  	if (of_property_read_string(remote, "data-mapping", &name))
  		/* default set it as format vesa 18 */
  		lvds->format = LVDS_VESA_18;
  	else
  		lvds->format = rockchip_lvds_name_to_format(name);
  
  	if (lvds->format < 0) {
  		DRM_DEV_ERROR(dev, "invalid data-mapping format [%s]\n", name);
  		ret = lvds->format;
  		goto err_put_remote;
  	}
  
  	encoder = &lvds->encoder;
  	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
  							     dev->of_node);
  
  	ret = drm_encoder_init(drm_dev, encoder, &rockchip_lvds_encoder_funcs,
  			       DRM_MODE_ENCODER_LVDS, NULL);
  	if (ret < 0) {
  		DRM_DEV_ERROR(drm_dev->dev,
  			      "failed to initialize encoder: %d\n", ret);
  		goto err_put_remote;
  	}
  
  	drm_encoder_helper_add(encoder, lvds->soc_data->helper_funcs);
  
  	if (lvds->panel) {
  		connector = &lvds->connector;
  		connector->dpms = DRM_MODE_DPMS_OFF;
  		ret = drm_connector_init(drm_dev, connector,
  					 &rockchip_lvds_connector_funcs,
  					 DRM_MODE_CONNECTOR_LVDS);
  		if (ret < 0) {
  			DRM_DEV_ERROR(drm_dev->dev,
  				      "failed to initialize connector: %d\n", ret);
  			goto err_free_encoder;
  		}
  
  		drm_connector_helper_add(connector,
  					 &rockchip_lvds_connector_helper_funcs);
  
  		ret = drm_connector_attach_encoder(connector, encoder);
  		if (ret < 0) {
  			DRM_DEV_ERROR(drm_dev->dev,
  				      "failed to attach encoder: %d\n", ret);
  			goto err_free_connector;
  		}
  
  		ret = drm_panel_attach(lvds->panel, connector);
  		if (ret < 0) {
  			DRM_DEV_ERROR(drm_dev->dev,
  				      "failed to attach panel: %d\n", ret);
  			goto err_free_connector;
  		}
  	} else {
  		ret = drm_bridge_attach(encoder, lvds->bridge, NULL, 0);
  		if (ret) {
  			DRM_DEV_ERROR(drm_dev->dev,
  				      "failed to attach bridge: %d\n", ret);
  			goto err_free_encoder;
  		}
  	}
  
  	pm_runtime_enable(dev);
  	of_node_put(remote);
  	of_node_put(port);
  
  	return 0;
  
  err_free_connector:
  	drm_connector_cleanup(connector);
  err_free_encoder:
  	drm_encoder_cleanup(encoder);
  err_put_remote:
  	of_node_put(remote);
  err_put_port:
  	of_node_put(port);
  
  	return ret;
  }
  
  static void rockchip_lvds_unbind(struct device *dev, struct device *master,
  				void *data)
  {
  	struct rockchip_lvds *lvds = dev_get_drvdata(dev);
  	const struct drm_encoder_helper_funcs *encoder_funcs;
  
  	encoder_funcs = lvds->soc_data->helper_funcs;
  	encoder_funcs->disable(&lvds->encoder);
  	if (lvds->panel)
  		drm_panel_detach(lvds->panel);
  	pm_runtime_disable(dev);
  	drm_connector_cleanup(&lvds->connector);
  	drm_encoder_cleanup(&lvds->encoder);
  }
  
  static const struct component_ops rockchip_lvds_component_ops = {
  	.bind = rockchip_lvds_bind,
  	.unbind = rockchip_lvds_unbind,
  };
  
  static int rockchip_lvds_probe(struct platform_device *pdev)
  {
  	struct device *dev = &pdev->dev;
  	struct rockchip_lvds *lvds;
  	const struct of_device_id *match;
  	int ret;
  
  	if (!dev->of_node)
  		return -ENODEV;
  
  	lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
  	if (!lvds)
  		return -ENOMEM;
  
  	lvds->dev = dev;
  	match = of_match_node(rockchip_lvds_dt_ids, dev->of_node);
  	if (!match)
  		return -ENODEV;
  	lvds->soc_data = match->data;
  
  	lvds->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
  						    "rockchip,grf");
  	if (IS_ERR(lvds->grf)) {
  		DRM_DEV_ERROR(dev, "missing rockchip,grf property\n");
  		return PTR_ERR(lvds->grf);
  	}
  
  	ret = lvds->soc_data->probe(pdev, lvds);
  	if (ret) {
  		DRM_DEV_ERROR(dev, "Platform initialization failed\n");
  		return ret;
  	}
  
  	dev_set_drvdata(dev, lvds);
  
  	ret = component_add(&pdev->dev, &rockchip_lvds_component_ops);
  	if (ret < 0) {
  		DRM_DEV_ERROR(dev, "failed to add component\n");
  		clk_unprepare(lvds->pclk);
  	}
  
  	return ret;
  }
  
  static int rockchip_lvds_remove(struct platform_device *pdev)
  {
  	struct rockchip_lvds *lvds = dev_get_drvdata(&pdev->dev);
  
  	component_del(&pdev->dev, &rockchip_lvds_component_ops);
  	clk_unprepare(lvds->pclk);
  
  	return 0;
  }
  
  struct platform_driver rockchip_lvds_driver = {
  	.probe = rockchip_lvds_probe,
  	.remove = rockchip_lvds_remove,
  	.driver = {
  		   .name = "rockchip-lvds",
  		   .of_match_table = of_match_ptr(rockchip_lvds_dt_ids),
  	},
  };
  