video: ti: am335x: restore driver-model code

The commit 82f7b869f5 ("video: Drop CONFIG_AM335X_LCD") removed not
only the LCD legacy implementation but also the code with driver model
support. The patch restores the code with driver model support.

Fixes: 82f7b869f5 ("video: Drop CONFIG_AM335X_LCD")
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/video/Kconfig

@@ -576,6 +576,8 @@ config ATMEL_HLCD
 	help
 	   HLCDC supports video output to an attached LCD panel.
 
+source "drivers/video/ti/Kconfig"
+
 source "drivers/video/exynos/Kconfig"
 
 config LOGICORE_DP_TX

drivers/video/Makefile

@@ -26,6 +26,7 @@ obj-${CONFIG_EXYNOS_FB} += exynos/
 obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/
 obj-${CONFIG_VIDEO_STM32} += stm32/
 obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
+obj-y += ti/
 
 obj-$(CONFIG_ATMEL_HLCD) += atmel_hlcdfb.o
 obj-$(CONFIG_ATMEL_LCD) += atmel_lcdfb.o

drivers/video/ti/Kconfig

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+#
+config AM335X_LCD
+	bool "Enable AM335x video support"
+	help
+	   Supports video output to an attached LCD panel.

drivers/video/ti/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+#
+
+obj-$(CONFIG_AM335X_LCD) += tilcdc.o tilcdc-panel.o

drivers/video/ti/tilcdc-panel.c

@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * OMAP panel support
+ *
+ * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+ */
+
+#include <common.h>
+#include <backlight.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <log.h>
+#include <panel.h>
+#include <asm/gpio.h>
+#include <linux/err.h>
+#include "tilcdc.h"
+
+struct tilcdc_panel_priv {
+	struct tilcdc_panel_info info;
+	struct display_timing timing;
+	struct udevice *backlight;
+	struct gpio_desc enable;
+};
+
+static int tilcdc_panel_enable_backlight(struct udevice *dev)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+
+	if (dm_gpio_is_valid(&priv->enable))
+		dm_gpio_set_value(&priv->enable, 1);
+
+	if (priv->backlight)
+		return backlight_enable(priv->backlight);
+
+	return 0;
+}
+
+static int tilcdc_panel_set_backlight(struct udevice *dev, int percent)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+
+	if (dm_gpio_is_valid(&priv->enable))
+		dm_gpio_set_value(&priv->enable, 1);
+
+	if (priv->backlight)
+		return backlight_set_brightness(priv->backlight, percent);
+
+	return 0;
+}
+
+int tilcdc_panel_get_display_info(struct udevice *dev,
+				  struct tilcdc_panel_info *info)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+
+	memcpy(info, &priv->info, sizeof(*info));
+	return 0;
+}
+
+static int tilcdc_panel_get_display_timing(struct udevice *dev,
+					   struct display_timing *timing)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+
+	memcpy(timing, &priv->timing, sizeof(*timing));
+	return 0;
+}
+
+static int tilcdc_panel_remove(struct udevice *dev)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+
+	if (dm_gpio_is_valid(&priv->enable))
+		dm_gpio_free(dev, &priv->enable);
+
+	return 0;
+}
+
+static int tilcdc_panel_probe(struct udevice *dev)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+	int err;
+
+	err = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
+					   "backlight", &priv->backlight);
+	if (err)
+		dev_warn(dev, "failed to get backlight\n");
+
+	err = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
+				   GPIOD_IS_OUT);
+	if (err) {
+		dev_warn(dev, "failed to get enable GPIO\n");
+		if (err != -ENOENT)
+			return err;
+	}
+
+	return 0;
+}
+
+static int tilcdc_panel_of_to_plat(struct udevice *dev)
+{
+	struct tilcdc_panel_priv *priv = dev_get_priv(dev);
+	ofnode node;
+	int err;
+
+	err = ofnode_decode_display_timing(dev_ofnode(dev), 0, &priv->timing);
+	if (err) {
+		dev_err(dev, "failed to get display timing\n");
+		return err;
+	}
+
+	node = dev_read_subnode(dev, "panel-info");
+	if (!ofnode_valid(node)) {
+		dev_err(dev, "missing 'panel-info' node\n");
+		return -ENXIO;
+	}
+
+	err |= ofnode_read_u32(node, "ac-bias", &priv->info.ac_bias);
+	err |= ofnode_read_u32(node, "ac-bias-intrpt",
+			       &priv->info.ac_bias_intrpt);
+	err |= ofnode_read_u32(node, "dma-burst-sz", &priv->info.dma_burst_sz);
+	err |= ofnode_read_u32(node, "bpp", &priv->info.bpp);
+	err |= ofnode_read_u32(node, "fdd", &priv->info.fdd);
+	err |= ofnode_read_u32(node, "sync-edge", &priv->info.sync_edge);
+	err |= ofnode_read_u32(node, "sync-ctrl", &priv->info.sync_ctrl);
+	err |= ofnode_read_u32(node, "raster-order", &priv->info.raster_order);
+	err |= ofnode_read_u32(node, "fifo-th", &priv->info.fifo_th);
+	if (err) {
+		dev_err(dev, "failed to get panel info\n");
+		return err;
+	}
+
+	/* optional */
+	priv->info.tft_alt_mode = ofnode_read_bool(node, "tft-alt-mode");
+	priv->info.invert_pxl_clk = ofnode_read_bool(node, "invert-pxl-clk");
+
+	dev_dbg(dev, "LCD: %dx%d, bpp=%d, clk=%d Hz\n",
+		priv->timing.hactive.typ, priv->timing.vactive.typ,
+		priv->info.bpp, priv->timing.pixelclock.typ);
+	dev_dbg(dev, "     hbp=%d, hfp=%d, hsw=%d\n",
+		priv->timing.hback_porch.typ, priv->timing.hfront_porch.typ,
+		priv->timing.hsync_len.typ);
+	dev_dbg(dev, "     vbp=%d, vfp=%d, vsw=%d\n",
+		priv->timing.vback_porch.typ, priv->timing.vfront_porch.typ,
+		priv->timing.vsync_len.typ);
+
+	return 0;
+}
+
+static const struct panel_ops tilcdc_panel_ops = {
+	.enable_backlight = tilcdc_panel_enable_backlight,
+	.set_backlight = tilcdc_panel_set_backlight,
+	.get_display_timing = tilcdc_panel_get_display_timing,
+};
+
+static const struct udevice_id tilcdc_panel_ids[] = {
+	{.compatible = "ti,tilcdc,panel"},
+	{}
+};
+
+U_BOOT_DRIVER(tilcdc_panel) = {
+	.name = "tilcdc_panel",
+	.id = UCLASS_PANEL,
+	.of_match = tilcdc_panel_ids,
+	.ops = &tilcdc_panel_ops,
+	.of_to_plat = tilcdc_panel_of_to_plat,
+	.probe = tilcdc_panel_probe,
+	.remove = tilcdc_panel_remove,
+	.priv_auto = sizeof(struct tilcdc_panel_priv),
+};

drivers/video/ti/tilcdc-panel.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+ */
+
+#ifndef _TILCDC_PANEL_H
+#define _TILCDC_PANEL_H
+
+#include "tilcdc.h"
+
+int tilcdc_panel_get_display_info(struct udevice *dev,
+				  struct tilcdc_panel_info *info);
+
+#endif /* _TILCDC_PANEL_H */

drivers/video/ti/tilcdc.c

@@ -0,0 +1,425 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <log.h>
+#include <panel.h>
+#include <video.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include <asm/utils.h>
+#include "tilcdc.h"
+#include "tilcdc-panel.h"
+
+#define LCDC_FMAX				200000000
+
+/* LCD Control Register */
+#define LCDC_CTRL_CLK_DIVISOR_MASK		GENMASK(15, 8)
+#define LCDC_CTRL_RASTER_MODE			BIT(0)
+#define LCDC_CTRL_CLK_DIVISOR(x)		(((x) & GENMASK(7, 0)) << 8)
+/* LCD Clock Enable Register */
+#define LCDC_CLKC_ENABLE_CORECLKEN		BIT(0)
+#define LCDC_CLKC_ENABLE_LIDDCLKEN		BIT(1)
+#define LCDC_CLKC_ENABLE_DMACLKEN		BIT(2)
+/* LCD DMA Control Register */
+#define LCDC_DMA_CTRL_BURST_SIZE(x)		(((x) & GENMASK(2, 0)) << 4)
+#define LCDC_DMA_CTRL_BURST_1			0x0
+#define LCDC_DMA_CTRL_BURST_2			0x1
+#define LCDC_DMA_CTRL_BURST_4			0x2
+#define LCDC_DMA_CTRL_BURST_8			0x3
+#define LCDC_DMA_CTRL_BURST_16			0x4
+#define LCDC_DMA_CTRL_FIFO_TH(x)		(((x) & GENMASK(2, 0)) << 8)
+/* LCD Timing_0 Register */
+#define LCDC_RASTER_TIMING_0_HORMSB(x)	((((x) - 1) & BIT(10)) >> 7)
+#define LCDC_RASTER_TIMING_0_HORLSB(x) (((((x) >> 4) - 1) & GENMASK(5, 0)) << 4)
+#define LCDC_RASTER_TIMING_0_HSWLSB(x)	((((x) - 1) & GENMASK(5, 0)) << 10)
+#define LCDC_RASTER_TIMING_0_HFPLSB(x)	((((x) - 1) & GENMASK(7, 0)) << 16)
+#define LCDC_RASTER_TIMING_0_HBPLSB(x)	((((x) - 1) & GENMASK(7, 0)) << 24)
+/* LCD Timing_1 Register */
+#define LCDC_RASTER_TIMING_1_VERLSB(x)		(((x) - 1) & GENMASK(9, 0))
+#define LCDC_RASTER_TIMING_1_VSW(x)	((((x) - 1) & GENMASK(5, 0)) << 10)
+#define LCDC_RASTER_TIMING_1_VFP(x)		(((x) & GENMASK(7, 0)) << 16)
+#define LCDC_RASTER_TIMING_1_VBP(x)		(((x) & GENMASK(7, 0)) << 24)
+/* LCD Timing_2 Register */
+#define LCDC_RASTER_TIMING_2_HFPMSB(x)	((((x) - 1) & GENMASK(9, 8)) >> 8)
+#define LCDC_RASTER_TIMING_2_HBPMSB(x)	((((x) - 1) & GENMASK(9, 8)) >> 4)
+#define LCDC_RASTER_TIMING_2_ACB(x)		(((x) & GENMASK(7, 0)) << 8)
+#define LCDC_RASTER_TIMING_2_ACBI(x)		(((x) & GENMASK(3, 0)) << 16)
+#define LCDC_RASTER_TIMING_2_VSYNC_INVERT	BIT(20)
+#define LCDC_RASTER_TIMING_2_HSYNC_INVERT	BIT(21)
+#define LCDC_RASTER_TIMING_2_PXCLK_INVERT	BIT(22)
+#define LCDC_RASTER_TIMING_2_DE_INVERT		BIT(23)
+#define LCDC_RASTER_TIMING_2_HSVS_RISEFALL	BIT(24)
+#define LCDC_RASTER_TIMING_2_HSVS_CONTROL	BIT(25)
+#define LCDC_RASTER_TIMING_2_VERMSB(x)		((((x) - 1) & BIT(10)) << 16)
+#define LCDC_RASTER_TIMING_2_HSWMSB(x)	((((x) - 1) & GENMASK(9, 6)) << 21)
+/* LCD Raster Ctrl Register */
+#define LCDC_RASTER_CTRL_ENABLE			BIT(0)
+#define LCDC_RASTER_CTRL_TFT_MODE		BIT(7)
+#define LCDC_RASTER_CTRL_DATA_ORDER		BIT(8)
+#define LCDC_RASTER_CTRL_REQDLY(x)		(((x) & GENMASK(7, 0)) << 12)
+#define LCDC_RASTER_CTRL_PALMODE_RAWDATA	(0x02 << 20)
+#define LCDC_RASTER_CTRL_TFT_ALT_ENABLE		BIT(23)
+#define LCDC_RASTER_CTRL_TFT_24BPP_MODE		BIT(25)
+#define LCDC_RASTER_CTRL_TFT_24BPP_UNPACK	BIT(26)
+
+enum {
+	LCDC_MAX_WIDTH = 2048,
+	LCDC_MAX_HEIGHT = 2048,
+	LCDC_MAX_LOG2_BPP = VIDEO_BPP32,
+};
+
+struct tilcdc_regs {
+	u32 pid;
+	u32 ctrl;
+	u32 gap0;
+	u32 lidd_ctrl;
+	u32 lidd_cs0_conf;
+	u32 lidd_cs0_addr;
+	u32 lidd_cs0_data;
+	u32 lidd_cs1_conf;
+	u32 lidd_cs1_addr;
+	u32 lidd_cs1_data;
+	u32 raster_ctrl;
+	u32 raster_timing0;
+	u32 raster_timing1;
+	u32 raster_timing2;
+	u32 raster_subpanel;
+	u32 raster_subpanel2;
+	u32 lcddma_ctrl;
+	u32 lcddma_fb0_base;
+	u32 lcddma_fb0_ceiling;
+	u32 lcddma_fb1_base;
+	u32 lcddma_fb1_ceiling;
+	u32 sysconfig;
+	u32 irqstatus_raw;
+	u32 irqstatus;
+	u32 irqenable_set;
+	u32 irqenable_clear;
+	u32 gap1;
+	u32 clkc_enable;
+	u32 clkc_reset;
+};
+
+struct tilcdc_priv {
+	struct tilcdc_regs *regs;
+	struct clk gclk;
+	struct clk dpll_m2_clk;
+};
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static ulong tilcdc_set_pixel_clk_rate(struct udevice *dev, ulong rate)
+{
+	struct tilcdc_priv *priv = dev_get_priv(dev);
+	struct tilcdc_regs *regs = priv->regs;
+	ulong mult_rate, mult_round_rate, best_err, err;
+	u32 v;
+	int div, i;
+
+	best_err = rate;
+	div = 0;
+	for (i = 2; i <= 255; i++) {
+		mult_rate = rate * i;
+		mult_round_rate = clk_round_rate(&priv->gclk, mult_rate);
+		if (IS_ERR_VALUE(mult_round_rate))
+			return mult_round_rate;
+
+		err = mult_rate - mult_round_rate;
+		if (err < best_err) {
+			best_err = err;
+			div = i;
+			if (err == 0)
+				break;
+		}
+	}
+
+	if (div == 0) {
+		dev_err(dev, "failed to find a divisor\n");
+		return -EFAULT;
+	}
+
+	mult_rate = clk_set_rate(&priv->gclk, rate * div);
+	v = readl(&regs->ctrl) & ~LCDC_CTRL_CLK_DIVISOR_MASK;
+	v |= LCDC_CTRL_CLK_DIVISOR(div);
+	writel(v, &regs->ctrl);
+	rate = mult_rate / div;
+	dev_dbg(dev, "rate=%ld, div=%d, err=%ld\n", rate, div, err);
+	return rate;
+}
+
+static int tilcdc_remove(struct udevice *dev)
+{
+	struct video_uc_plat *uc_plat = dev_get_uclass_plat(dev);
+	struct tilcdc_priv *priv = dev_get_priv(dev);
+
+	uc_plat->base -= 0x20;
+	uc_plat->size += 0x20;
+	clk_release_all(&priv->gclk, 1);
+	clk_release_all(&priv->dpll_m2_clk, 1);
+	return 0;
+}
+
+static int tilcdc_probe(struct udevice *dev)
+{
+	struct video_uc_plat *uc_plat = dev_get_uclass_plat(dev);
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct tilcdc_priv *priv = dev_get_priv(dev);
+	struct tilcdc_regs *regs = priv->regs;
+	struct udevice *panel, *clk_dev;
+	struct tilcdc_panel_info info;
+	struct display_timing timing;
+	ulong rate;
+	u32 reg;
+	int err;
+
+	/* Before relocation we don't need to do anything */
+	if (!(gd->flags & GD_FLG_RELOC))
+		return 0;
+
+	err = uclass_get_device(UCLASS_PANEL, 0, &panel);
+	if (err) {
+		dev_err(dev, "failed to get panel\n");
+		return err;
+	}
+
+	err = panel_get_display_timing(panel, &timing);
+	if (err) {
+		dev_err(dev, "failed to get display timing\n");
+		return err;
+	}
+
+	if (timing.pixelclock.typ > (LCDC_FMAX / 2)) {
+		dev_err(dev, "invalid display clock-frequency: %d Hz\n",
+			timing.pixelclock.typ);
+		return -EINVAL;
+	}
+
+	if (timing.hactive.typ > LCDC_MAX_WIDTH)
+		timing.hactive.typ = LCDC_MAX_WIDTH;
+
+	if (timing.vactive.typ > LCDC_MAX_HEIGHT)
+		timing.vactive.typ = LCDC_MAX_HEIGHT;
+
+	err = tilcdc_panel_get_display_info(panel, &info);
+	if (err) {
+		dev_err(dev, "failed to get panel info\n");
+		return err;
+	}
+
+	switch (info.bpp) {
+	case 16:
+	case 24:
+	case 32:
+		break;
+	default:
+		dev_err(dev, "invalid seting, bpp: %d\n", info.bpp);
+		return -EINVAL;
+	}
+
+	switch (info.dma_burst_sz) {
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+	case 16:
+		break;
+	default:
+		dev_err(dev, "invalid setting, dma-burst-sz: %d\n",
+			info.dma_burst_sz);
+		return -EINVAL;
+	}
+
+	err = uclass_get_device_by_name(UCLASS_CLK, "lcd_gclk@534", &clk_dev);
+	if (err) {
+		dev_err(dev, "failed to get lcd_gclk device\n");
+		return err;
+	}
+
+	err = clk_request(clk_dev, &priv->gclk);
+	if (err) {
+		dev_err(dev, "failed to get %s clock\n", clk_dev->name);
+		return err;
+	}
+
+	rate = tilcdc_set_pixel_clk_rate(dev, timing.pixelclock.typ);
+	if (IS_ERR_VALUE(rate)) {
+		dev_err(dev, "failed to set pixel clock rate\n");
+		return rate;
+	}
+
+	err = uclass_get_device_by_name(UCLASS_CLK, "dpll_disp_m2_ck@4a4",
+					&clk_dev);
+	if (err) {
+		dev_err(dev, "failed to get dpll_disp_m2 clock device\n");
+		return err;
+	}
+
+	err = clk_request(clk_dev, &priv->dpll_m2_clk);
+	if (err) {
+		dev_err(dev, "failed to get %s clock\n", clk_dev->name);
+		return err;
+	}
+
+	err = clk_set_parent(&priv->gclk, &priv->dpll_m2_clk);
+	if (err) {
+		dev_err(dev, "failed to set %s clock as %s's parent\n",
+			priv->dpll_m2_clk.dev->name, priv->gclk.dev->name);
+		return err;
+	}
+
+	/* palette default entry */
+	memset((void *)uc_plat->base, 0, 0x20);
+	*(unsigned int *)uc_plat->base = 0x4000;
+	/* point fb behind palette */
+	uc_plat->base += 0x20;
+	uc_plat->size -= 0x20;
+
+	writel(LCDC_CLKC_ENABLE_CORECLKEN | LCDC_CLKC_ENABLE_LIDDCLKEN |
+	       LCDC_CLKC_ENABLE_DMACLKEN, &regs->clkc_enable);
+	writel(0, &regs->raster_ctrl);
+
+	reg = readl(&regs->ctrl) & LCDC_CTRL_CLK_DIVISOR_MASK;
+	reg |= LCDC_CTRL_RASTER_MODE;
+	writel(reg, &regs->ctrl);
+
+	reg = (timing.hactive.typ * timing.vactive.typ * info.bpp) >> 3;
+	reg += uc_plat->base;
+	writel(uc_plat->base, &regs->lcddma_fb0_base);
+	writel(reg, &regs->lcddma_fb0_ceiling);
+	writel(uc_plat->base, &regs->lcddma_fb1_base);
+	writel(reg, &regs->lcddma_fb1_ceiling);
+
+	reg = LCDC_DMA_CTRL_FIFO_TH(info.fifo_th);
+	switch (info.dma_burst_sz) {
+	case 1:
+		reg |= LCDC_DMA_CTRL_BURST_SIZE(LCDC_DMA_CTRL_BURST_1);
+		break;
+	case 2:
+		reg |= LCDC_DMA_CTRL_BURST_SIZE(LCDC_DMA_CTRL_BURST_2);
+		break;
+	case 4:
+		reg |= LCDC_DMA_CTRL_BURST_SIZE(LCDC_DMA_CTRL_BURST_4);
+		break;
+	case 8:
+		reg |= LCDC_DMA_CTRL_BURST_SIZE(LCDC_DMA_CTRL_BURST_8);
+		break;
+	case 16:
+		reg |= LCDC_DMA_CTRL_BURST_SIZE(LCDC_DMA_CTRL_BURST_16);
+		break;
+	}
+
+	writel(reg, &regs->lcddma_ctrl);
+
+	writel(LCDC_RASTER_TIMING_0_HORLSB(timing.hactive.typ) |
+	       LCDC_RASTER_TIMING_0_HORMSB(timing.hactive.typ) |
+	       LCDC_RASTER_TIMING_0_HFPLSB(timing.hfront_porch.typ) |
+	       LCDC_RASTER_TIMING_0_HBPLSB(timing.hback_porch.typ) |
+	       LCDC_RASTER_TIMING_0_HSWLSB(timing.hsync_len.typ),
+	       &regs->raster_timing0);
+
+	writel(LCDC_RASTER_TIMING_1_VBP(timing.vback_porch.typ) |
+	       LCDC_RASTER_TIMING_1_VFP(timing.vfront_porch.typ) |
+	       LCDC_RASTER_TIMING_1_VSW(timing.vsync_len.typ) |
+	       LCDC_RASTER_TIMING_1_VERLSB(timing.vactive.typ),
+	       &regs->raster_timing1);
+
+	reg = LCDC_RASTER_TIMING_2_ACB(info.ac_bias) |
+		LCDC_RASTER_TIMING_2_ACBI(info.ac_bias_intrpt) |
+		LCDC_RASTER_TIMING_2_HSWMSB(timing.hsync_len.typ) |
+		LCDC_RASTER_TIMING_2_VERMSB(timing.vactive.typ) |
+		LCDC_RASTER_TIMING_2_HBPMSB(timing.hback_porch.typ) |
+		LCDC_RASTER_TIMING_2_HFPMSB(timing.hfront_porch.typ);
+
+	if (timing.flags & DISPLAY_FLAGS_VSYNC_LOW)
+		reg |= LCDC_RASTER_TIMING_2_VSYNC_INVERT;
+
+	if (timing.flags & DISPLAY_FLAGS_HSYNC_LOW)
+		reg |= LCDC_RASTER_TIMING_2_HSYNC_INVERT;
+
+	if (info.invert_pxl_clk)
+		reg |= LCDC_RASTER_TIMING_2_PXCLK_INVERT;
+
+	if (info.sync_edge)
+		reg |= LCDC_RASTER_TIMING_2_HSVS_RISEFALL;
+
+	if (info.sync_ctrl)
+		reg |= LCDC_RASTER_TIMING_2_HSVS_CONTROL;
+
+	writel(reg, &regs->raster_timing2);
+
+	reg = LCDC_RASTER_CTRL_PALMODE_RAWDATA | LCDC_RASTER_CTRL_TFT_MODE |
+		LCDC_RASTER_CTRL_ENABLE | LCDC_RASTER_CTRL_REQDLY(info.fdd);
+
+	if (info.tft_alt_mode)
+		reg |= LCDC_RASTER_CTRL_TFT_ALT_ENABLE;
+
+	if (info.bpp == 24)
+		reg |= LCDC_RASTER_CTRL_TFT_24BPP_MODE;
+	else if (info.bpp == 32)
+		reg |= LCDC_RASTER_CTRL_TFT_24BPP_MODE |
+			LCDC_RASTER_CTRL_TFT_24BPP_UNPACK;
+
+	if (info.raster_order)
+		reg |= LCDC_RASTER_CTRL_DATA_ORDER;
+
+	writel(reg, &regs->raster_ctrl);
+
+	uc_priv->xsize = timing.hactive.typ;
+	uc_priv->ysize = timing.vactive.typ;
+	uc_priv->bpix = log_2_n_round_up(info.bpp);
+
+	err = panel_enable_backlight(panel);
+	if (err) {
+		dev_err(dev, "failed to enable panel backlight\n");
+		return err;
+	}
+
+	return 0;
+}
+
+static int tilcdc_of_to_plat(struct udevice *dev)
+{
+	struct tilcdc_priv *priv = dev_get_priv(dev);
+
+	priv->regs = (struct tilcdc_regs *)dev_read_addr(dev);
+	if ((fdt_addr_t)priv->regs == FDT_ADDR_T_NONE) {
+		dev_err(dev, "failed to get base address\n");
+		return -EINVAL;
+	}
+
+	dev_dbg(dev, "LCD: base address=0x%x\n", (unsigned int)priv->regs);
+	return 0;
+}
+
+static int tilcdc_bind(struct udevice *dev)
+{
+	struct video_uc_plat *uc_plat = dev_get_uclass_plat(dev);
+
+	uc_plat->size = ((LCDC_MAX_WIDTH * LCDC_MAX_HEIGHT *
+			  (1 << LCDC_MAX_LOG2_BPP)) >> 3) + 0x20;
+
+	dev_dbg(dev, "frame buffer size 0x%x\n", uc_plat->size);
+	return 0;
+}
+
+static const struct udevice_id tilcdc_ids[] = {
+	{.compatible = "ti,am33xx-tilcdc"},
+	{}
+};
+
+U_BOOT_DRIVER(tilcdc) = {
+	.name = "tilcdc",
+	.id = UCLASS_VIDEO,
+	.of_match = tilcdc_ids,
+	.bind = tilcdc_bind,
+	.of_to_plat = tilcdc_of_to_plat,
+	.probe = tilcdc_probe,
+	.remove = tilcdc_remove,
+	.priv_auto = sizeof(struct tilcdc_priv)
+};

drivers/video/ti/tilcdc.h

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
+ */
+
+#ifndef _TILCDC_H
+#define _TILCDC_H
+
+/**
+ * tilcdc_panel_info: Panel parameters
+ *
+ * @ac_bias: AC Bias Pin Frequency
+ * @ac_bias_intrpt: AC Bias Pin Transitions per Interrupt
+ * @dma_burst_sz: DMA burst size
+ * @bpp: Bits per pixel
+ * @fdd: FIFO DMA Request Delay
+ * @tft_alt_mode: TFT Alternative Signal Mapping (Only for active)
+ * @invert_pxl_clk: Invert pixel clock
+ * @sync_edge: Horizontal and Vertical Sync Edge: 0=rising 1=falling
+ * @sync_ctrl: Horizontal and Vertical Sync: Control: 0=ignore
+ * @raster_order: Raster Data Order Select: 1=Most-to-least 0=Least-to-most
+ * @fifo_th: DMA FIFO threshold
+ */
+struct tilcdc_panel_info {
+	u32 ac_bias;
+	u32 ac_bias_intrpt;
+	u32 dma_burst_sz;
+	u32 bpp;
+	u32 fdd;
+	bool tft_alt_mode;
+	bool invert_pxl_clk;
+	u32 sync_edge;
+	u32 sync_ctrl;
+	u32 raster_order;
+	u32 fifo_th;
+};
+
+#endif /* _TILCDC_H */