drivers/video/rockchip/rk_vop.c - uboot-imx - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2015 Google, Inc
  * Copyright 2014 Rockchip Inc.
  */

 #include <common.h>
 #include <clk.h>
 #include <display.h>
 #include <dm.h>
 #include <edid.h>
 #include <regmap.h>
 #include <syscon.h>
 #include <video.h>
 #include <asm/gpio.h>
 #include <asm/hardware.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/edp_rk3288.h>
 #include <asm/arch/vop_rk3288.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #include <power/regulator.h>
 #include "rk_vop.h"

 DECLARE_GLOBAL_DATA_PTR;

 enum vop_pol {
 	HSYNC_POSITIVE = 0,
 	VSYNC_POSITIVE = 1,
 	DEN_NEGATIVE   = 2,
 	DCLK_INVERT    = 3
 };

 static void rkvop_enable(struct rk3288_vop *regs, ulong fbbase,
 			 int fb_bits_per_pixel,
 			 const struct display_timing *edid)
 {
 	u32 lb_mode;
 	u32 rgb_mode;
 	u32 hactive = edid->hactive.typ;
 	u32 vactive = edid->vactive.typ;

 	writel(V_ACT_WIDTH(hactive - 1) | V_ACT_HEIGHT(vactive - 1),
 	       &regs->win0_act_info);

 	writel(V_DSP_XST(edid->hsync_len.typ + edid->hback_porch.typ) |
 	       V_DSP_YST(edid->vsync_len.typ + edid->vback_porch.typ),
 	       &regs->win0_dsp_st);

 	writel(V_DSP_WIDTH(hactive - 1) |
 		V_DSP_HEIGHT(vactive - 1),
 		&regs->win0_dsp_info);

 	clrsetbits_le32(&regs->win0_color_key, M_WIN0_KEY_EN | M_WIN0_KEY_COLOR,
 			V_WIN0_KEY_EN(0) | V_WIN0_KEY_COLOR(0));

 	switch (fb_bits_per_pixel) {
 	case 16:
 		rgb_mode = RGB565;
 		writel(V_RGB565_VIRWIDTH(hactive), &regs->win0_vir);
 		break;
 	case 24:
 		rgb_mode = RGB888;
 		writel(V_RGB888_VIRWIDTH(hactive), &regs->win0_vir);
 		break;
 	case 32:
 	default:
 		rgb_mode = ARGB8888;
 		writel(V_ARGB888_VIRWIDTH(hactive), &regs->win0_vir);
 		break;
 	}

 	if (hactive > 2560)
 		lb_mode = LB_RGB_3840X2;
 	else if (hactive > 1920)
 		lb_mode = LB_RGB_2560X4;
 	else if (hactive > 1280)
 		lb_mode = LB_RGB_1920X5;
 	else
 		lb_mode = LB_RGB_1280X8;

 	clrsetbits_le32(&regs->win0_ctrl0,
 			M_WIN0_LB_MODE | M_WIN0_DATA_FMT | M_WIN0_EN,
 			V_WIN0_LB_MODE(lb_mode) | V_WIN0_DATA_FMT(rgb_mode) |
 			V_WIN0_EN(1));

 	writel(fbbase, &regs->win0_yrgb_mst);
 	writel(0x01, &regs->reg_cfg_done); /* enable reg config */
 }

 static void rkvop_set_pin_polarity(struct udevice *dev,
 				   enum vop_modes mode, u32 polarity)
 {
 	struct rkvop_driverdata *ops =
 		(struct rkvop_driverdata *)dev_get_driver_data(dev);

 	if (ops->set_pin_polarity)
 		ops->set_pin_polarity(dev, mode, polarity);
 }

 static void rkvop_enable_output(struct udevice *dev, enum vop_modes mode)
 {
 	struct rk_vop_priv *priv = dev_get_priv(dev);
 	struct rk3288_vop *regs = priv->regs;

 	/* remove from standby */
 	clrbits_le32(&regs->sys_ctrl, V_STANDBY_EN(1));

 	switch (mode) {
 	case VOP_MODE_HDMI:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
 				V_HDMI_OUT_EN(1));
 		break;

 	case VOP_MODE_EDP:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
 				V_EDP_OUT_EN(1));
 		break;

 	case VOP_MODE_LVDS:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
 				V_RGB_OUT_EN(1));
 		break;

 	case VOP_MODE_MIPI:
 		clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
 				V_MIPI_OUT_EN(1));
 		break;

 	default:
 		debug("%s: unsupported output mode %x\n", __func__, mode);
 	}
 }

 static void rkvop_mode_set(struct udevice *dev,
 			   const struct display_timing *edid,
 			   enum vop_modes mode)
 {
 	struct rk_vop_priv *priv = dev_get_priv(dev);
 	struct rk3288_vop *regs = priv->regs;
 	struct rkvop_driverdata *data =
 		(struct rkvop_driverdata *)dev_get_driver_data(dev);

 	u32 hactive = edid->hactive.typ;
 	u32 vactive = edid->vactive.typ;
 	u32 hsync_len = edid->hsync_len.typ;
 	u32 hback_porch = edid->hback_porch.typ;
 	u32 vsync_len = edid->vsync_len.typ;
 	u32 vback_porch = edid->vback_porch.typ;
 	u32 hfront_porch = edid->hfront_porch.typ;
 	u32 vfront_porch = edid->vfront_porch.typ;
 	int mode_flags;
 	u32 pin_polarity;

 	pin_polarity = BIT(DCLK_INVERT);
 	if (edid->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 		pin_polarity |= BIT(HSYNC_POSITIVE);
 	if (edid->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 		pin_polarity |= BIT(VSYNC_POSITIVE);

 	rkvop_set_pin_polarity(dev, mode, pin_polarity);
 	rkvop_enable_output(dev, mode);

 	mode_flags = 0;  /* RGB888 */
 	if ((data->features & VOP_FEATURE_OUTPUT_10BIT) &&
 	    (mode == VOP_MODE_HDMI || mode == VOP_MODE_EDP))
 		mode_flags = 15;  /* RGBaaa */

 	clrsetbits_le32(&regs->dsp_ctrl0, M_DSP_OUT_MODE,
 			V_DSP_OUT_MODE(mode_flags));

 	writel(V_HSYNC(hsync_len) |
 	       V_HORPRD(hsync_len + hback_porch + hactive + hfront_porch),
 			&regs->dsp_htotal_hs_end);

 	writel(V_HEAP(hsync_len + hback_porch + hactive) |
 	       V_HASP(hsync_len + hback_porch),
 	       &regs->dsp_hact_st_end);

 	writel(V_VSYNC(vsync_len) |
 	       V_VERPRD(vsync_len + vback_porch + vactive + vfront_porch),
 	       &regs->dsp_vtotal_vs_end);

 	writel(V_VAEP(vsync_len + vback_porch + vactive)|
 	       V_VASP(vsync_len + vback_porch),
 	       &regs->dsp_vact_st_end);

 	writel(V_HEAP(hsync_len + hback_porch + hactive) |
 	       V_HASP(hsync_len + hback_porch),
 	       &regs->post_dsp_hact_info);

 	writel(V_VAEP(vsync_len + vback_porch + vactive)|
 	       V_VASP(vsync_len + vback_porch),
 	       &regs->post_dsp_vact_info);

 	writel(0x01, &regs->reg_cfg_done); /* enable reg config */
 }

 /**
  * rk_display_init() - Try to enable the given display device
  *
  * This function performs many steps:
  * - Finds the display device being referenced by @ep_node
  * - Puts the VOP's ID into its uclass platform data
  * - Probes the device to set it up
  * - Reads the EDID timing information
  * - Sets up the VOP clocks, etc. for the selected pixel clock and display mode
  * - Enables the display (the display device handles this and will do different
  *     things depending on the display type)
  * - Tells the uclass about the display resolution so that the console will
  *     appear correctly
  *
  * @dev:	VOP device that we want to connect to the display
  * @fbbase:	Frame buffer address
  * @ep_node:	Device tree node to process - this is the offset of an endpoint
  *		node within the VOP's 'port' list.
  * @return 0 if OK, -ve if something went wrong
  */
 static int rk_display_init(struct udevice *dev, ulong fbbase, ofnode ep_node)
 {
 	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct rk_vop_priv *priv = dev_get_priv(dev);
 	int vop_id, remote_vop_id;
 	struct rk3288_vop *regs = priv->regs;
 	struct display_timing timing;
 	struct udevice *disp;
 	int ret;
 	u32 remote_phandle;
 	struct display_plat *disp_uc_plat;
 	struct clk clk;
 	enum video_log2_bpp l2bpp;
 	ofnode remote;

 	debug("%s(%s, %lu, %s)\n", __func__,
 	      dev_read_name(dev), fbbase, ofnode_get_name(ep_node));

 	vop_id = ofnode_read_s32_default(ep_node, "reg", -1);
 	debug("vop_id=%d\n", vop_id);
 	ret = ofnode_read_u32(ep_node, "remote-endpoint", &remote_phandle);
 	if (ret)
 		return ret;

 	remote = ofnode_get_by_phandle(remote_phandle);
 	if (!ofnode_valid(remote))
 		return -EINVAL;
 	remote_vop_id = ofnode_read_u32_default(remote, "reg", -1);
 	debug("remote vop_id=%d\n", remote_vop_id);

 	/*
 	 * The remote-endpoint references into a subnode of the encoder
 	 * (i.e. HDMI, MIPI, etc.) with the DTS looking something like
 	 * the following (assume 'hdmi_in_vopl' to be referenced):
 	 *
 	 * hdmi: hdmi@ff940000 {
 	 *   ports {
 	 *     hdmi_in: port {
 	 *       hdmi_in_vopb: endpoint@0 { ... };
 	 *       hdmi_in_vopl: endpoint@1 { ... };
 	 *     }
 	 *   }
 	 * }
 	 *
 	 * The original code had 3 steps of "walking the parent", but
 	 * a much better (as in: less likely to break if the DTS
 	 * changes) way of doing this is to "find the enclosing device
 	 * of UCLASS_DISPLAY".
 	 */
 	while (ofnode_valid(remote)) {
 		remote = ofnode_get_parent(remote);
 		if (!ofnode_valid(remote)) {
 			debug("%s(%s): no UCLASS_DISPLAY for remote-endpoint\n",
 			      __func__, dev_read_name(dev));
 			return -EINVAL;
 		}

 		uclass_find_device_by_ofnode(UCLASS_DISPLAY, remote, &disp);
 		if (disp)
 			break;
 	};

 	disp_uc_plat = dev_get_uclass_platdata(disp);
 	debug("Found device '%s', disp_uc_priv=%p\n", disp->name, disp_uc_plat);
 	if (display_in_use(disp)) {
 		debug("   - device in use\n");
 		return -EBUSY;
 	}

 	disp_uc_plat->source_id = remote_vop_id;
 	disp_uc_plat->src_dev = dev;

 	ret = device_probe(disp);
 	if (ret) {
 		debug("%s: device '%s' display won't probe (ret=%d)\n",
 		      __func__, dev->name, ret);
 		return ret;
 	}

 	ret = display_read_timing(disp, &timing);
 	if (ret) {
 		debug("%s: Failed to read timings\n", __func__);
 		return ret;
 	}

 	ret = clk_get_by_index(dev, 1, &clk);
 	if (!ret)
 		ret = clk_set_rate(&clk, timing.pixelclock.typ);
 	if (IS_ERR_VALUE(ret)) {
 		debug("%s: Failed to set pixel clock: ret=%d\n", __func__, ret);
 		return ret;
 	}

 	/* Set bitwidth for vop display according to vop mode */
 	switch (vop_id) {
 	case VOP_MODE_EDP:
 	case VOP_MODE_LVDS:
 		l2bpp = VIDEO_BPP16;
 		break;
 	case VOP_MODE_HDMI:
 	case VOP_MODE_MIPI:
 		l2bpp = VIDEO_BPP32;
 		break;
 	default:
 		l2bpp = VIDEO_BPP16;
 	}

 	rkvop_mode_set(dev, &timing, vop_id);
 	rkvop_enable(regs, fbbase, 1 << l2bpp, &timing);

 	ret = display_enable(disp, 1 << l2bpp, &timing);
 	if (ret)
 		return ret;

 	uc_priv->xsize = timing.hactive.typ;
 	uc_priv->ysize = timing.vactive.typ;
 	uc_priv->bpix = l2bpp;
 	debug("fb=%lx, size=%d %d\n", fbbase, uc_priv->xsize, uc_priv->ysize);

 	return 0;
 }

 void rk_vop_probe_regulators(struct udevice *dev,
 			     const char * const *names, int cnt)
 {
 	int i, ret;
 	const char *name;
 	struct udevice *reg;

 	for (i = 0; i < cnt; ++i) {
 		name = names[i];
 		debug("%s: probing regulator '%s'\n", dev->name, name);

 		ret = regulator_autoset_by_name(name, &reg);
 		if (!ret)
 			ret = regulator_set_enable(reg, true);
 	}
 }

 int rk_vop_probe(struct udevice *dev)
 {
 	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
 	struct rk_vop_priv *priv = dev_get_priv(dev);
 	int ret = 0;
 	ofnode port, node;

 	/* Before relocation we don't need to do anything */
 	if (!(gd->flags & GD_FLG_RELOC))
 		return 0;

 	priv->regs = (struct rk3288_vop *)dev_read_addr(dev);

 	/*
 	 * Try all the ports until we find one that works. In practice this
 	 * tries EDP first if available, then HDMI.
 	 *
 	 * Note that rockchip_vop_set_clk() always uses NPLL as the source
 	 * clock so it is currently not possible to use more than one display
 	 * device simultaneously.
 	 */
 	port = dev_read_subnode(dev, "port");
 	if (!ofnode_valid(port)) {
 		debug("%s(%s): 'port' subnode not found\n",
 		      __func__, dev_read_name(dev));
 		return -EINVAL;
 	}

 	for (node = ofnode_first_subnode(port);
 	     ofnode_valid(node);
 	     node = dev_read_next_subnode(node)) {
 		ret = rk_display_init(dev, plat->base, node);
 		if (ret)
 			debug("Device failed: ret=%d\n", ret);
 		if (!ret)
 			break;
 	}
 	video_set_flush_dcache(dev, 1);

 	return ret;
 }

 int rk_vop_bind(struct udevice *dev)
 {
 	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);

 	plat->size = 4 * (CONFIG_VIDEO_ROCKCHIP_MAX_XRES *
 			  CONFIG_VIDEO_ROCKCHIP_MAX_YRES);

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2015 Google, Inc
	* Copyright 2014 Rockchip Inc.
	*/

	#include <common.h>
	#include <clk.h>
	#include <display.h>
	#include <dm.h>
	#include <edid.h>
	#include <regmap.h>
	#include <syscon.h>
	#include <video.h>
	#include <asm/gpio.h>
	#include <asm/hardware.h>
	#include <asm/io.h>
	#include <asm/arch/clock.h>
	#include <asm/arch/edp_rk3288.h>
	#include <asm/arch/vop_rk3288.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>
	#include <power/regulator.h>
	#include "rk_vop.h"

	DECLARE_GLOBAL_DATA_PTR;

	enum vop_pol {
	HSYNC_POSITIVE = 0,
	VSYNC_POSITIVE = 1,
	DEN_NEGATIVE = 2,
	DCLK_INVERT = 3
	};

	static void rkvop_enable(struct rk3288_vop *regs, ulong fbbase,
	int fb_bits_per_pixel,
	const struct display_timing *edid)
	{
	u32 lb_mode;
	u32 rgb_mode;
	u32 hactive = edid->hactive.typ;
	u32 vactive = edid->vactive.typ;

	writel(V_ACT_WIDTH(hactive - 1) \| V_ACT_HEIGHT(vactive - 1),
	&regs->win0_act_info);

	writel(V_DSP_XST(edid->hsync_len.typ + edid->hback_porch.typ) \|
	V_DSP_YST(edid->vsync_len.typ + edid->vback_porch.typ),
	&regs->win0_dsp_st);

	writel(V_DSP_WIDTH(hactive - 1) \|
	V_DSP_HEIGHT(vactive - 1),
	&regs->win0_dsp_info);

	clrsetbits_le32(&regs->win0_color_key, M_WIN0_KEY_EN \| M_WIN0_KEY_COLOR,
	V_WIN0_KEY_EN(0) \| V_WIN0_KEY_COLOR(0));

	switch (fb_bits_per_pixel) {
	case 16:
	rgb_mode = RGB565;
	writel(V_RGB565_VIRWIDTH(hactive), &regs->win0_vir);
	break;
	case 24:
	rgb_mode = RGB888;
	writel(V_RGB888_VIRWIDTH(hactive), &regs->win0_vir);
	break;
	case 32:
	default:
	rgb_mode = ARGB8888;
	writel(V_ARGB888_VIRWIDTH(hactive), &regs->win0_vir);
	break;
	}

	if (hactive > 2560)
	lb_mode = LB_RGB_3840X2;
	else if (hactive > 1920)
	lb_mode = LB_RGB_2560X4;
	else if (hactive > 1280)
	lb_mode = LB_RGB_1920X5;
	else
	lb_mode = LB_RGB_1280X8;

	clrsetbits_le32(&regs->win0_ctrl0,
	M_WIN0_LB_MODE \| M_WIN0_DATA_FMT \| M_WIN0_EN,
	V_WIN0_LB_MODE(lb_mode) \| V_WIN0_DATA_FMT(rgb_mode) \|
	V_WIN0_EN(1));

	writel(fbbase, &regs->win0_yrgb_mst);
	writel(0x01, &regs->reg_cfg_done); /* enable reg config */
	}

	static void rkvop_set_pin_polarity(struct udevice *dev,
	enum vop_modes mode, u32 polarity)
	{
	struct rkvop_driverdata *ops =
	(struct rkvop_driverdata *)dev_get_driver_data(dev);

	if (ops->set_pin_polarity)
	ops->set_pin_polarity(dev, mode, polarity);
	}

	static void rkvop_enable_output(struct udevice *dev, enum vop_modes mode)
	{
	struct rk_vop_priv *priv = dev_get_priv(dev);
	struct rk3288_vop *regs = priv->regs;

	/* remove from standby */
	clrbits_le32(&regs->sys_ctrl, V_STANDBY_EN(1));

	switch (mode) {
	case VOP_MODE_HDMI:
	clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
	V_HDMI_OUT_EN(1));
	break;

	case VOP_MODE_EDP:
	clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
	V_EDP_OUT_EN(1));
	break;

	case VOP_MODE_LVDS:
	clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
	V_RGB_OUT_EN(1));
	break;

	case VOP_MODE_MIPI:
	clrsetbits_le32(&regs->sys_ctrl, M_ALL_OUT_EN,
	V_MIPI_OUT_EN(1));
	break;

	default:
	debug("%s: unsupported output mode %x\n", __func__, mode);
	}
	}

	static void rkvop_mode_set(struct udevice *dev,
	const struct display_timing *edid,
	enum vop_modes mode)
	{
	struct rk_vop_priv *priv = dev_get_priv(dev);
	struct rk3288_vop *regs = priv->regs;
	struct rkvop_driverdata *data =
	(struct rkvop_driverdata *)dev_get_driver_data(dev);

	u32 hactive = edid->hactive.typ;
	u32 vactive = edid->vactive.typ;
	u32 hsync_len = edid->hsync_len.typ;
	u32 hback_porch = edid->hback_porch.typ;
	u32 vsync_len = edid->vsync_len.typ;
	u32 vback_porch = edid->vback_porch.typ;
	u32 hfront_porch = edid->hfront_porch.typ;
	u32 vfront_porch = edid->vfront_porch.typ;
	int mode_flags;
	u32 pin_polarity;

	pin_polarity = BIT(DCLK_INVERT);
	if (edid->flags & DISPLAY_FLAGS_HSYNC_HIGH)
	pin_polarity \|= BIT(HSYNC_POSITIVE);
	if (edid->flags & DISPLAY_FLAGS_VSYNC_HIGH)
	pin_polarity \|= BIT(VSYNC_POSITIVE);

	rkvop_set_pin_polarity(dev, mode, pin_polarity);
	rkvop_enable_output(dev, mode);

	mode_flags = 0; /* RGB888 */
	if ((data->features & VOP_FEATURE_OUTPUT_10BIT) &&
	(mode == VOP_MODE_HDMI \|\| mode == VOP_MODE_EDP))
	mode_flags = 15; /* RGBaaa */

	clrsetbits_le32(&regs->dsp_ctrl0, M_DSP_OUT_MODE,
	V_DSP_OUT_MODE(mode_flags));

	writel(V_HSYNC(hsync_len) \|
	V_HORPRD(hsync_len + hback_porch + hactive + hfront_porch),
	&regs->dsp_htotal_hs_end);

	writel(V_HEAP(hsync_len + hback_porch + hactive) \|
	V_HASP(hsync_len + hback_porch),
	&regs->dsp_hact_st_end);

	writel(V_VSYNC(vsync_len) \|
	V_VERPRD(vsync_len + vback_porch + vactive + vfront_porch),
	&regs->dsp_vtotal_vs_end);

	writel(V_VAEP(vsync_len + vback_porch + vactive)\|
	V_VASP(vsync_len + vback_porch),
	&regs->dsp_vact_st_end);

	writel(V_HEAP(hsync_len + hback_porch + hactive) \|
	V_HASP(hsync_len + hback_porch),
	&regs->post_dsp_hact_info);

	writel(V_VAEP(vsync_len + vback_porch + vactive)\|
	V_VASP(vsync_len + vback_porch),
	&regs->post_dsp_vact_info);

	writel(0x01, &regs->reg_cfg_done); /* enable reg config */
	}

	/**
	* rk_display_init() - Try to enable the given display device
	*
	* This function performs many steps:
	* - Finds the display device being referenced by @ep_node
	* - Puts the VOP's ID into its uclass platform data
	* - Probes the device to set it up
	* - Reads the EDID timing information
	* - Sets up the VOP clocks, etc. for the selected pixel clock and display mode
	* - Enables the display (the display device handles this and will do different
	* things depending on the display type)
	* - Tells the uclass about the display resolution so that the console will
	* appear correctly
	*
	* @dev: VOP device that we want to connect to the display
	* @fbbase: Frame buffer address
	* @ep_node: Device tree node to process - this is the offset of an endpoint
	* node within the VOP's 'port' list.
	* @return 0 if OK, -ve if something went wrong
	*/
	static int rk_display_init(struct udevice *dev, ulong fbbase, ofnode ep_node)
	{
	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
	struct rk_vop_priv *priv = dev_get_priv(dev);
	int vop_id, remote_vop_id;
	struct rk3288_vop *regs = priv->regs;
	struct display_timing timing;
	struct udevice *disp;
	int ret;
	u32 remote_phandle;
	struct display_plat *disp_uc_plat;
	struct clk clk;
	enum video_log2_bpp l2bpp;
	ofnode remote;

	debug("%s(%s, %lu, %s)\n", __func__,
	dev_read_name(dev), fbbase, ofnode_get_name(ep_node));

	vop_id = ofnode_read_s32_default(ep_node, "reg", -1);
	debug("vop_id=%d\n", vop_id);
	ret = ofnode_read_u32(ep_node, "remote-endpoint", &remote_phandle);
	if (ret)
	return ret;

	remote = ofnode_get_by_phandle(remote_phandle);
	if (!ofnode_valid(remote))
	return -EINVAL;
	remote_vop_id = ofnode_read_u32_default(remote, "reg", -1);
	debug("remote vop_id=%d\n", remote_vop_id);

	/*
	* The remote-endpoint references into a subnode of the encoder
	* (i.e. HDMI, MIPI, etc.) with the DTS looking something like
	* the following (assume 'hdmi_in_vopl' to be referenced):
	*
	* hdmi: hdmi@ff940000 {
	* ports {
	* hdmi_in: port {
	* hdmi_in_vopb: endpoint@0 { ... };
	* hdmi_in_vopl: endpoint@1 { ... };
	* }
	* }
	* }
	*
	* The original code had 3 steps of "walking the parent", but
	* a much better (as in: less likely to break if the DTS
	* changes) way of doing this is to "find the enclosing device
	* of UCLASS_DISPLAY".
	*/
	while (ofnode_valid(remote)) {
	remote = ofnode_get_parent(remote);
	if (!ofnode_valid(remote)) {
	debug("%s(%s): no UCLASS_DISPLAY for remote-endpoint\n",
	__func__, dev_read_name(dev));
	return -EINVAL;
	}

	uclass_find_device_by_ofnode(UCLASS_DISPLAY, remote, &disp);
	if (disp)
	break;
	};

	disp_uc_plat = dev_get_uclass_platdata(disp);
	debug("Found device '%s', disp_uc_priv=%p\n", disp->name, disp_uc_plat);
	if (display_in_use(disp)) {
	debug(" - device in use\n");
	return -EBUSY;
	}

	disp_uc_plat->source_id = remote_vop_id;
	disp_uc_plat->src_dev = dev;

	ret = device_probe(disp);
	if (ret) {
	debug("%s: device '%s' display won't probe (ret=%d)\n",
	__func__, dev->name, ret);
	return ret;
	}

	ret = display_read_timing(disp, &timing);
	if (ret) {
	debug("%s: Failed to read timings\n", __func__);
	return ret;
	}

	ret = clk_get_by_index(dev, 1, &clk);
	if (!ret)
	ret = clk_set_rate(&clk, timing.pixelclock.typ);
	if (IS_ERR_VALUE(ret)) {
	debug("%s: Failed to set pixel clock: ret=%d\n", __func__, ret);
	return ret;
	}

	/* Set bitwidth for vop display according to vop mode */
	switch (vop_id) {
	case VOP_MODE_EDP:
	case VOP_MODE_LVDS:
	l2bpp = VIDEO_BPP16;
	break;
	case VOP_MODE_HDMI:
	case VOP_MODE_MIPI:
	l2bpp = VIDEO_BPP32;
	break;
	default:
	l2bpp = VIDEO_BPP16;
	}

	rkvop_mode_set(dev, &timing, vop_id);
	rkvop_enable(regs, fbbase, 1 << l2bpp, &timing);

	ret = display_enable(disp, 1 << l2bpp, &timing);
	if (ret)
	return ret;

	uc_priv->xsize = timing.hactive.typ;
	uc_priv->ysize = timing.vactive.typ;
	uc_priv->bpix = l2bpp;
	debug("fb=%lx, size=%d %d\n", fbbase, uc_priv->xsize, uc_priv->ysize);

	return 0;
	}

	void rk_vop_probe_regulators(struct udevice *dev,
	const char * const *names, int cnt)
	{
	int i, ret;
	const char *name;
	struct udevice *reg;

	for (i = 0; i < cnt; ++i) {
	name = names[i];
	debug("%s: probing regulator '%s'\n", dev->name, name);

	ret = regulator_autoset_by_name(name, &reg);
	if (!ret)
	ret = regulator_set_enable(reg, true);
	}
	}

	int rk_vop_probe(struct udevice *dev)
	{
	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
	struct rk_vop_priv *priv = dev_get_priv(dev);
	int ret = 0;
	ofnode port, node;

	/* Before relocation we don't need to do anything */
	if (!(gd->flags & GD_FLG_RELOC))
	return 0;

	priv->regs = (struct rk3288_vop *)dev_read_addr(dev);

	/*
	* Try all the ports until we find one that works. In practice this
	* tries EDP first if available, then HDMI.
	*
	* Note that rockchip_vop_set_clk() always uses NPLL as the source
	* clock so it is currently not possible to use more than one display
	* device simultaneously.
	*/
	port = dev_read_subnode(dev, "port");
	if (!ofnode_valid(port)) {
	debug("%s(%s): 'port' subnode not found\n",
	__func__, dev_read_name(dev));
	return -EINVAL;
	}

	for (node = ofnode_first_subnode(port);
	ofnode_valid(node);
	node = dev_read_next_subnode(node)) {
	ret = rk_display_init(dev, plat->base, node);
	if (ret)
	debug("Device failed: ret=%d\n", ret);
	if (!ret)
	break;
	}
	video_set_flush_dcache(dev, 1);

	return ret;
	}

	int rk_vop_bind(struct udevice *dev)
	{
	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);

	plat->size = 4 * (CONFIG_VIDEO_ROCKCHIP_MAX_XRES *
	CONFIG_VIDEO_ROCKCHIP_MAX_YRES);

	return 0;
	}