ark1668ed-bsp/linux/drivers/gpu/drm/stm/lvds.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2023, STMicroelectronics - All Rights Reserved
 * Author(s): Raphaël GALLAIS-POU <raphael.gallais-pou@foss.st.com> for STMicroelectronics.
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_device.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset.h>

/* LVDS Host registers */
#define LVDS_CR		0x0000  /* configuration register */
#define LVDS_DMLCR0	0x0004  /* data mapping lsb configuration register 0 */
#define LVDS_DMMCR0	0x0008  /* data mapping msb configuration register 0 */
#define LVDS_DMLCR1	0x000C  /* data mapping lsb configuration register 1 */
#define LVDS_DMMCR1	0x0010  /* data mapping msb configuration register 1 */
#define LVDS_DMLCR2	0x0014  /* data mapping lsb configuration register 2 */
#define LVDS_DMMCR2	0x0018  /* data mapping msb configuration register 2 */
#define LVDS_DMLCR3	0x001C  /* data mapping lsb configuration register 3 */
#define LVDS_DMMCR3	0x0020  /* data mapping msb configuration register 3 */
#define LVDS_DMLCR4	0x0024  /* data mapping lsb configuration register 4 */
#define LVDS_DMMCR4	0x0028  /* data mapping msb configuration register 4 */
#define LVDS_CDL1CR	0x002C  /* channel distrib link 1 configuration register */
#define LVDS_CDL2CR	0x0030  /* channel distrib link 2 configuration register */

#define CDL1CR_DEFAULT	0x04321 /* Default value for CDL1CR */
#define CDL2CR_DEFAULT	0x59876 /* Default value for CDL2CR */

#define LVDS_DMLCR(bit)	(LVDS_DMLCR0 + 0x8 * (bit))
#define LVDS_DMMCR(bit)	(LVDS_DMMCR0 + 0x8 * (bit))

/* LVDS Wrapper registers */
#define LVDS_WCLKCR	0x11B0  /* Wrapper clock control register */

#define LVDS_HWCFGR	0x1FF0  /* HW configuration register	*/
#define LVDS_VERR	0x1FF4  /* Version register	*/
#define LVDS_IPIDR	0x1FF8  /* Identification register	*/
#define LVDS_SIDR	0x1FFC  /* Size Identification register	*/

/* Bitfield description */
#define CR_LVDSEN	BIT(0)  /* LVDS PHY Enable */
#define CR_HSPOL	BIT(1)  /* Horizontal Synchronization Polarity */
#define CR_VSPOL	BIT(2)  /* Vertical Synchronization Polarity */
#define CR_DEPOL	BIT(3)  /* Data Enable Polarity */
#define CR_CI		BIT(4)  /* Control Internal (software controlled bit) */
#define CR_LKMOD	BIT(5)  /* Link Mode, for both Links */
#define CR_LKPHA	BIT(6)  /* Link Phase, for both Links */
#define CR_LK1POL	GENMASK(20, 16)  /* Link-1 output Polarity */
#define CR_LK2POL	GENMASK(25, 21)  /* Link-2 output Polarity */

#define DMMCR_MAP0	GENMASK(4, 0) /* Mapping for bit 0 of datalane x */
#define DMMCR_MAP1	GENMASK(9, 5) /* Mapping for bit 1 of datalane x */
#define DMMCR_MAP2	GENMASK(14, 10) /* Mapping for bit 2 of datalane x */
#define DMMCR_MAP3	GENMASK(19, 15) /* Mapping for bit 3 of datalane x */
#define DMLCR_MAP4	GENMASK(4, 0) /* Mapping for bit 4 of datalane x */
#define DMLCR_MAP5	GENMASK(9, 5) /* Mapping for bit 5 of datalane x */
#define DMLCR_MAP6	GENMASK(14, 10) /* Mapping for bit 6 of datalane x */

#define CDLCR_DISTR0	GENMASK(3, 0) /* Channel distribution for lane 0 */
#define CDLCR_DISTR1	GENMASK(7, 4) /* Channel distribution for lane 1 */
#define CDLCR_DISTR2	GENMASK(11, 8) /* Channel distribution for lane 2 */
#define CDLCR_DISTR3	GENMASK(15, 12) /* Channel distribution for lane 3 */
#define CDLCR_DISTR4	GENMASK(19, 16) /* Channel distribution for lane 4 */

#define PHY_GCR_BIT_CLK_OUT	BIT(0)  /* BIT clock enable */
#define PHY_GCR_LS_CLK_OUT	BIT(4)  /* LS clock enable */
#define PHY_GCR_DP_CLK_OUT	BIT(8)  /* DP clock enable */
#define PHY_GCR_RSTZ		BIT(24) /* LVDS PHY digital reset */
#define PHY_GCR_DIV_RSTN	BIT(25) /* Output divider reset */
#define PHY_SCR_TX_EN		BIT(16) /* Transmission mode enable */
/* Current mode driver enable */
#define PHY_CMCR_CM_EN_DL	(BIT(28) | BIT(20) | BIT(12) | BIT(4))
#define PHY_CMCR_CM_EN_DL4	BIT(4)
/* Bias enable */
#define PHY_BCR1_EN_BIAS_DL	(BIT(16) | BIT(12) | BIT(8) | BIT(4) | BIT(0))
#define PHY_BCR2_BIAS_EN	BIT(28)
/* Voltage mode driver enable */
#define PHY_BCR3_VM_EN_DL	(BIT(16) | BIT(12) | BIT(8) | BIT(4) | BIT(0))
#define PHY_DCR_POWER_OK	BIT(12)
#define PHY_CFGCR_EN_DIG_DL	GENMASK(4, 0) /* LVDS PHY digital lane enable */
#define PHY_PLLCR1_PLL_EN	BIT(0) /* LVDS PHY PLL enable */
#define PHY_PLLCR1_EN_SD	BIT(1) /* LVDS PHY PLL sigma-delta signal enable */
#define PHY_PLLCR1_EN_TWG	BIT(2) /* LVDS PHY PLL triangular wave generator enable */
#define PHY_PLLCR1_DIV_EN	BIT(8) /* LVDS PHY PLL dividers enable */
#define PHY_PLLCR2_NDIV		GENMASK(25, 16) /* NDIV mask value */
#define PHY_PLLCR2_BDIV		GENMASK(9, 0)   /* BDIV mask value */
#define PHY_PLLSR_PLL_LOCK	BIT(0) /* LVDS PHY PLL lock status */
#define PHY_PLLSDCR1_MDIV	GENMASK(9, 0)   /* MDIV mask value */
#define PHY_PLLTESTCR_TDIV	GENMASK(25, 16) /* TDIV mask value */
#define PHY_PLLTESTCR_CLK_EN	BIT(0) /* Test clock enable */
#define PHY_PLLTESTCR_EN	BIT(8) /* Test divider output enable */

#define WCLKCR_SECND_CLKPIX_SEL	BIT(0) /* Pixel clock selection */
#define WCLKCR_SRCSEL		BIT(8) /* Source selection for the pixel clock */

/* Sleep & timeout for pll lock/unlock */
#define SLEEP_US	1000
#define TIMEOUT_US	200000

/*
 * The link phase defines whether an ODD pixel is carried over together with
 * the next EVEN pixel or together with the previous EVEN pixel.
 *
 * LVDS_DUAL_LINK_EVEN_ODD_PIXELS (LKPHA = 0)
 *
 * ,--------.  ,--------.  ,--------.  ,--------.  ,---------.
 * | ODD  LK \/ PIXEL  3 \/ PIXEL  1 \/ PIXEL' 1 \/ PIXEL' 3 |
 * | EVEN LK /\ PIXEL  2 /\ PIXEL' 0 /\ PIXEL' 2 /\ PIXEL' 4 |
 * `--------'  `--------'  `--------'  `--------'  `---------'
 *
 * LVDS_DUAL_LINK_ODD_EVEN_PIXELS (LKPHA = 1)
 *
 * ,--------.  ,--------.  ,--------.  ,--------.  ,---------.
 * | ODD  LK \/ PIXEL  3 \/ PIXEL  1 \/ PIXEL' 1 \/ PIXEL' 3 |
 * | EVEN LK /\ PIXEL  4 /\ PIXEL  2 /\ PIXEL' 0 /\ PIXEL' 2 |
 * `--------'  `--------'  `--------'  `--------'  `---------'
 *
 */
enum lvds_link_type {
	LVDS_SINGLE_LINK_PRIMARY = 0,
	LVDS_SINGLE_LINK_SECONDARY,
	LVDS_DUAL_LINK_EVEN_ODD_PIXELS,
	LVDS_DUAL_LINK_ODD_EVEN_PIXELS,
};

enum lvds_pixel {
	PIX_R_0 = 0,
	PIX_R_1,
	PIX_R_2,
	PIX_R_3,
	PIX_R_4,
	PIX_R_5,
	PIX_R_6,
	PIX_R_7,
	PIX_G_0,
	PIX_G_1,
	PIX_G_2,
	PIX_G_3,
	PIX_G_4,
	PIX_G_5,
	PIX_G_6,
	PIX_G_7,
	PIX_B_0,
	PIX_B_1,
	PIX_B_2,
	PIX_B_3,
	PIX_B_4,
	PIX_B_5,
	PIX_B_6,
	PIX_B_7,
	PIX_H_S,
	PIX_V_S,
	PIX_D_E,
	PIX_C_E,
	PIX_C_I,
	PIX_TOG,
	PIX_ONE,
	PIX_ZER,
};

struct phy_reg_offsets {
	u32 GCR;	/* Global Control Register	*/
	u32 CMCR1;    /* Current Mode Control Register 1 */
	u32 CMCR2;    /* Current Mode Control Register 2 */
	u32 SCR;      /* Serial Control Register	*/
	u32 BCR1;     /* Bias Control Register 1	*/
	u32 BCR2;     /* Bias Control Register 2	*/
	u32 BCR3;     /* Bias Control Register 3	*/
	u32 MPLCR;    /* Monitor PLL Lock Control Register */
	u32 DCR;      /* Debug Control Register	*/
	u32 SSR1;     /* Spare Status Register 1	*/
	u32 CFGCR;    /* Configuration Control Register */
	u32 PLLCR1;   /* PLL_MODE 1 Control Register	*/
	u32 PLLCR2;   /* PLL_MODE 2 Control Register	*/
	u32 PLLSR;    /* PLL Status Register	*/
	u32 PLLSDCR1; /* PLL_SD_1 Control Register	*/
	u32 PLLSDCR2; /* PLL_SD_2 Control Register	*/
	u32 PLLTWGCR1;/* PLL_TWG_1 Control Register	*/
	u32 PLLTWGCR2;/* PLL_TWG_2 Control Register	*/
	u32 PLLCPCR;  /* PLL_CP Control Register	*/
	u32 PLLTESTCR;/* PLL_TEST Control Register	*/
};

struct lvds_phy_info {
	u32 base;
	struct phy_reg_offsets ofs;
};

static struct lvds_phy_info lvds_phy_16ff_primary = {
	.base = 0x1000,
	.ofs = {
		.GCR = 0x0,
		.CMCR1 = 0xC,
		.CMCR2 = 0x10,
		.SCR = 0x20,
		.BCR1 = 0x2C,
		.BCR2 = 0x30,
		.BCR3 = 0x34,
		.MPLCR = 0x64,
		.DCR = 0x84,
		.SSR1 = 0x88,
		.CFGCR = 0xA0,
		.PLLCR1 = 0xC0,
		.PLLCR2 = 0xC4,
		.PLLSR = 0xC8,
		.PLLSDCR1 = 0xCC,
		.PLLSDCR2 = 0xD0,
		.PLLTWGCR1 = 0xD4,
		.PLLTWGCR2 = 0xD8,
		.PLLCPCR = 0xE0,
		.PLLTESTCR = 0xE8,
	}
};

static struct lvds_phy_info lvds_phy_16ff_secondary = {
	.base = 0x1100,
	.ofs = {
		.GCR = 0x0,
		.CMCR1 = 0xC,
		.CMCR2 = 0x10,
		.SCR = 0x20,
		.BCR1 = 0x2C,
		.BCR2 = 0x30,
		.BCR3 = 0x34,
		.MPLCR = 0x64,
		.DCR = 0x84,
		.SSR1 = 0x88,
		.CFGCR = 0xA0,
		.PLLCR1 = 0xC0,
		.PLLCR2 = 0xC4,
		.PLLSR = 0xC8,
		.PLLSDCR1 = 0xCC,
		.PLLSDCR2 = 0xD0,
		.PLLTWGCR1 = 0xD4,
		.PLLTWGCR2 = 0xD8,
		.PLLCPCR = 0xE0,
		.PLLTESTCR = 0xE8,
	}
};

struct stm_lvds {
	void __iomem *base;
	struct device *dev;
	struct clk *pclk;		/* APB peripheral clock */
	struct clk *pllref_clk;		/* Reference clock for the internal PLL */
	struct clk_hw lvds_ck_px;	/* Pixel clock */
	u32 pixel_clock_rate;		/* Pixel clock rate */

	struct lvds_phy_info *primary;
	struct lvds_phy_info *secondary;

	struct drm_bridge lvds_bridge;
	struct drm_bridge *next_bridge;
	struct drm_connector connector;
	struct drm_encoder *encoder;
	struct drm_panel *panel;

	u32 hw_version;
	u32 link_type;
};

#define bridge_to_stm_lvds(b) \
	container_of(b, struct stm_lvds, lvds_bridge)

#define connector_to_stm_lvds(c) \
	container_of(c, struct stm_lvds, connector)

#define lvds_is_dual_link(lvds) \
	({	\
	typeof(lvds) __lvds = (lvds);	\
	__lvds == LVDS_DUAL_LINK_EVEN_ODD_PIXELS ||	\
	__lvds == LVDS_DUAL_LINK_ODD_EVEN_PIXELS;	\
	})

static inline void lvds_write(struct stm_lvds *lvds, u32 reg, u32 val)
{
	writel(val, lvds->base + reg);
}

static inline u32 lvds_read(struct stm_lvds *lvds, u32 reg)
{
	return readl(lvds->base + reg);
}

static inline void lvds_set(struct stm_lvds *lvds, u32 reg, u32 mask)
{
	lvds_write(lvds, reg, lvds_read(lvds, reg) | mask);
}

static inline void lvds_clear(struct stm_lvds *lvds, u32 reg, u32 mask)
{
	lvds_write(lvds, reg, lvds_read(lvds, reg) & ~mask);
}

/*
 * Expected JEIDA-RGB888 data to be sent in LSB format
 *	    bit6 ............................bit0
 * CHAN0   {ONE, ONE, ZERO, ZERO, ZERO, ONE, ONE}
 * CHAN1   {G2,  R7,  R6,   R5,   R4,   R3,  R2}
 * CHAN2   {B3,  B2,  G7,   G6,   G5,   G4,  G3}
 * CHAN3   {DE,  VS,  HS,   B7,   B6,   B5,  B4}
 * CHAN4   {CE,  B1,  B0,   G1,   G0,   R1,  R0}
 */
static enum lvds_pixel lvds_bitmap_jeida_rgb888[5][7] = {
	{ PIX_ONE, PIX_ONE, PIX_ZER, PIX_ZER, PIX_ZER, PIX_ONE, PIX_ONE },
	{ PIX_G_2, PIX_R_7, PIX_R_6, PIX_R_5, PIX_R_4, PIX_R_3, PIX_R_2 },
	{ PIX_B_3, PIX_B_2, PIX_G_7, PIX_G_6, PIX_G_5, PIX_G_4, PIX_G_3 },
	{ PIX_D_E, PIX_V_S, PIX_H_S, PIX_B_7, PIX_B_6, PIX_B_5, PIX_B_4 },
	{ PIX_C_E, PIX_B_1, PIX_B_0, PIX_G_1, PIX_G_0, PIX_R_1, PIX_R_0 }
};

/*
 * Expected VESA-RGB888 data to be sent in LSB format
 *	    bit6 ............................bit0
 * CHAN0   {ONE, ONE, ZERO, ZERO, ZERO, ONE, ONE}
 * CHAN1   {G0,  R5,  R4,   R3,   R2,   R1,  R0}
 * CHAN2   {B1,  B0,  G5,   G4,   G3,   G2,  G1}
 * CHAN3   {DE,  VS,  HS,   B5,   B4,   B3,  B2}
 * CHAN4   {CE,  B7,  B6,   G7,   G6,   R7,  R6}
 */
static enum lvds_pixel lvds_bitmap_vesa_rgb888[5][7] = {
	{ PIX_ONE, PIX_ONE, PIX_ZER, PIX_ZER, PIX_ZER, PIX_ONE, PIX_ONE },
	{ PIX_G_0, PIX_R_5, PIX_R_4, PIX_R_3, PIX_R_2, PIX_R_1, PIX_R_0 },
	{ PIX_B_1, PIX_B_0, PIX_G_5, PIX_G_4, PIX_G_3, PIX_G_2, PIX_G_1 },
	{ PIX_D_E, PIX_V_S, PIX_H_S, PIX_B_5, PIX_B_4, PIX_B_3, PIX_B_2 },
	{ PIX_C_E, PIX_B_7, PIX_B_6, PIX_G_7, PIX_G_6, PIX_R_7, PIX_R_6 }
};

/*
 * Clocks and PHY related functions
 */
static int lvds_pll_enable(struct stm_lvds *lvds, struct lvds_phy_info *phy)
{
	struct drm_device *drm = lvds->lvds_bridge.dev;
	u32 lvds_gcr;
	int val, ret;

	/*
	 * PLL lock timing control for the monitor unmask after startup (pll_en)
	 * Adjusted value so that the masking window is opened at start-up
	 */
	lvds_write(lvds, phy->base + phy->ofs.MPLCR, (0x200 - 0x160) << 16);

	/* Enable bias */
	lvds_write(lvds, phy->base + phy->ofs.BCR2, PHY_BCR2_BIAS_EN);

	/* Enable DP, LS, BIT clock output */
	lvds_gcr = PHY_GCR_DP_CLK_OUT | PHY_GCR_LS_CLK_OUT | PHY_GCR_BIT_CLK_OUT;
	lvds_set(lvds, phy->base + phy->ofs.GCR, lvds_gcr);

	/* Power up all output dividers */
	lvds_set(lvds, phy->base + phy->ofs.PLLTESTCR, PHY_PLLTESTCR_EN);
	lvds_set(lvds, phy->base + phy->ofs.PLLCR1, PHY_PLLCR1_DIV_EN);

	/* Set PHY in serial transmission mode */
	lvds_set(lvds, phy->base + phy->ofs.SCR, PHY_SCR_TX_EN);

	/* Enable the LVDS PLL & wait for its lock */
	lvds_set(lvds, phy->base + phy->ofs.PLLCR1, PHY_PLLCR1_PLL_EN);
	ret = readl_poll_timeout_atomic(lvds->base + phy->base + phy->ofs.PLLSR,
					val, val & PHY_PLLSR_PLL_LOCK,
					SLEEP_US, TIMEOUT_US);
	if (ret)
		drm_err(drm, "!TIMEOUT! waiting PLL, let's continue\n");

	/* WCLKCR_SECND_CLKPIX_SEL is for dual link */
	lvds_write(lvds, LVDS_WCLKCR, WCLKCR_SECND_CLKPIX_SEL);

	lvds_set(lvds, phy->ofs.PLLTESTCR, PHY_PLLTESTCR_CLK_EN);

	return ret;
}

static int pll_get_clkout_khz(int clkin_khz, int bdiv, int mdiv, int ndiv)
{
	int divisor = ndiv * bdiv;

	/* Prevents from division by 0 */
	if (!divisor)
		return 0;

	return clkin_khz * mdiv / divisor;
}

#define TDIV	70
#define NDIV_MIN	2
#define NDIV_MAX	6
#define BDIV_MIN	2
#define BDIV_MAX	6
#define MDIV_MIN	1
#define MDIV_MAX	1023

static int lvds_pll_get_params(struct stm_lvds *lvds,
			       unsigned int clkin_khz, unsigned int clkout_khz,
			       unsigned int *bdiv, unsigned int *mdiv, unsigned int *ndiv)
{
	int delta, best_delta; /* all in khz */
	int i, o, n;

	/* Early checks preventing division by 0 & odd results */
	if (clkin_khz <= 0 || clkout_khz <= 0)
		return -EINVAL;

	best_delta = 1000000; /* big started value (1000000khz) */

	for (i = NDIV_MIN; i <= NDIV_MAX; i++) {
		for (o = BDIV_MIN; o <= BDIV_MAX; o++) {
			n = DIV_ROUND_CLOSEST(i * o * clkout_khz, clkin_khz);
			/* Check ndiv according to vco range */
			if (n < MDIV_MIN || n > MDIV_MAX)
				continue;
			/* Check if new delta is better & saves parameters */
			delta = pll_get_clkout_khz(clkin_khz, i, n, o) - clkout_khz;
			if (delta < 0)
				delta = -delta;
			if (delta < best_delta) {
				*ndiv = i;
				*mdiv = n;
				*bdiv = o;
				best_delta = delta;
			}
			/* fast return in case of "perfect result" */
			if (!delta)
				return 0;
		}
	}

	return 0;
}

static void lvds_pll_config(struct stm_lvds *lvds, struct lvds_phy_info *phy)
{
	unsigned int pll_in_khz, bdiv = 0, mdiv = 0, ndiv = 0;
	struct clk_hw *hwclk;
	int multiplier;

	/*
	 * The LVDS PHY includes a low power low jitter high performance and
	 * highly configuration Phase Locked Loop supporting integer and
	 * fractional multiplication ratios and Spread Spectrum Clocking.  In
	 * integer mode, the only software supported feature for now, the PLL is
	 * made of a pre-divider NDIV, a feedback multiplier MDIV, followed by
	 * several post-dividers, each one with a specific application.
	 *
	 *          ,------.         ,-----.     ,-----.
	 * Fref --> | NDIV | -Fpdf-> | PFD | --> | VCO | --------> Fvco
	 *          `------'     ,-> |     |     `-----'  |
	 *                       |   `-----'              |
	 *                       |         ,------.       |
	 *                       `-------- | MDIV | <-----'
	 *                                 `------'
	 *
	 * From the output of the VCO, the clock can be optionally extracted on
	 * the RCC clock observer, with a divider TDIV, for testing purpose, or
	 * is passed through a programmable post-divider BDIV.  Finally, the
	 * frequency can be divided further with two fixed dividers.
	 *
	 *                            ,--------.
	 *                    ,-----> | DP div | ----------------> Fdp
	 *          ,------.  |       `--------'
	 * Fvco --> | BDIV | ------------------------------------> Fbit
	 *      |   `------'    ,------.   |
	 *      `-------------> | TDIV | --.---------------------> ClkObs
	 *                      '------'   |    ,--------.
	 *                                 `--> | LS div | ------> Fls
	 *                                      '--------'
	 *
	 * The LS and DP clock dividers operate at a fixed ratio of 7 and 3.5
	 * respectively with regards to fbit. LS divider converts the bit clock
	 * to a pixel clock per lane per clock sample (Fls).  This is useful
	 * when used to generate a dot clock for the display unit RGB output,
	 * and DP divider is.
	 */

	hwclk = __clk_get_hw(lvds->pllref_clk);
	if (!hwclk)
		return;

	pll_in_khz = clk_hw_get_rate(hwclk) / 1000;

	if (lvds_is_dual_link(lvds->link_type))
		multiplier = 2;
	else
		multiplier = 1;

	lvds_pll_get_params(lvds, pll_in_khz,
			    lvds->pixel_clock_rate * 7 / 1000 / multiplier,
			    &bdiv, &mdiv, &ndiv);

	/* Set BDIV, MDIV and NDIV */
	lvds_write(lvds, phy->base + phy->ofs.PLLCR2, ndiv << 16);
	lvds_set(lvds, phy->base + phy->ofs.PLLCR2, bdiv);
	lvds_write(lvds, phy->base + phy->ofs.PLLSDCR1, mdiv);

	/* Hardcode TDIV as dynamic values are not yet implemented */
	lvds_write(lvds, phy->base + phy->ofs.PLLTESTCR, TDIV << 16);

	/*
	 * For now, PLL just needs to be in integer mode
	 * Fractional and spread spectrum clocking are not yet implemented
	 *
	 * PLL integer mode:
	 *	- PMRY_PLL_TWG_STEP = PMRY_PLL_SD_INT_RATIO
	 *	- EN_TWG = 0
	 *	- EN_SD = 0
	 *	- DOWN_SPREAD = 0
	 *
	 * PLL fractional mode:
	 *	- EN_TWG = 0
	 *	- EN_SD = 1
	 *	- DOWN_SPREAD = 0
	 *
	 * Spread Spectrum Clocking
	 *	- EN_TWG = 1
	 *	- EN_SD = 1
	 */

	/* Disable TWG and SD */
	lvds_clear(lvds, phy->base + phy->ofs.PLLCR1, PHY_PLLCR1_EN_TWG | PHY_PLLCR1_EN_SD);

	/* Power up bias and PLL dividers */
	lvds_set(lvds, phy->base + phy->ofs.DCR, PHY_DCR_POWER_OK);
	lvds_set(lvds, phy->base + phy->ofs.CMCR1, PHY_CMCR_CM_EN_DL);
	lvds_set(lvds, phy->base + phy->ofs.CMCR2, PHY_CMCR_CM_EN_DL4);

	/* Set up voltage mode */
	lvds_set(lvds, phy->base + phy->ofs.PLLCPCR, 0x1);
	lvds_set(lvds, phy->base + phy->ofs.BCR3, PHY_BCR3_VM_EN_DL);
	lvds_set(lvds, phy->base + phy->ofs.BCR1, PHY_BCR1_EN_BIAS_DL);
	/* Enable digital datalanes */
	lvds_set(lvds, phy->base + phy->ofs.CFGCR, PHY_CFGCR_EN_DIG_DL);
}

static int lvds_pixel_clk_enable(struct clk_hw *hw)
{
	struct stm_lvds *lvds = container_of(hw, struct stm_lvds, lvds_ck_px);
	struct drm_device *drm = lvds->lvds_bridge.dev;
	struct lvds_phy_info *phy;
	int ret;

	ret = clk_prepare_enable(lvds->pclk);
	if (ret) {
		drm_err(drm, "Failed to enable lvds peripheral clk\n");
		return ret;
	}

	ret = clk_prepare_enable(lvds->pllref_clk);
	if (ret) {
		drm_err(drm, "Failed to enable lvds reference clk\n");
		clk_disable_unprepare(lvds->pclk);
		return ret;
	}

	/* In case we are operating in dual link the second PHY is set before the primary PHY. */
	if (lvds->secondary) {
		phy = lvds->secondary;

		/* Release LVDS PHY from reset mode */
		lvds_set(lvds, phy->base + phy->ofs.GCR, PHY_GCR_DIV_RSTN | PHY_GCR_RSTZ);
		lvds_pll_config(lvds, phy);

		ret = lvds_pll_enable(lvds, phy);
		if (ret) {
			drm_err(drm, "Failed to enable secondary PHY PLL: %d\n", ret);
			return ret;
		}
	}

	if (lvds->primary) {
		phy = lvds->primary;

		/* Release LVDS PHY from reset mode */
		lvds_set(lvds, phy->base + phy->ofs.GCR, PHY_GCR_DIV_RSTN | PHY_GCR_RSTZ);
		lvds_pll_config(lvds, phy);

		ret = lvds_pll_enable(lvds, phy);
		if (ret) {
			drm_err(drm, "Failed to enable primary PHY PLL: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static void lvds_pixel_clk_disable(struct clk_hw *hw)
{
	struct stm_lvds *lvds = container_of(hw, struct stm_lvds, lvds_ck_px);

	/*
	 * For each PHY:
	 * Disable DP, LS, BIT clock outputs
	 * Shutdown the PLL
	 * Assert LVDS PHY in reset mode
	 */

	if (lvds->primary) {
		lvds_clear(lvds, lvds->primary->base + lvds->primary->ofs.GCR,
			   (PHY_GCR_DP_CLK_OUT | PHY_GCR_LS_CLK_OUT | PHY_GCR_BIT_CLK_OUT));
		lvds_clear(lvds, lvds->primary->base + lvds->primary->ofs.PLLCR1,
			   PHY_PLLCR1_PLL_EN);
		lvds_clear(lvds, lvds->primary->base + lvds->primary->ofs.GCR,
			   PHY_GCR_DIV_RSTN | PHY_GCR_RSTZ);
	}

	if (lvds->secondary) {
		lvds_clear(lvds, lvds->secondary->base + lvds->secondary->ofs.GCR,
			   (PHY_GCR_DP_CLK_OUT | PHY_GCR_LS_CLK_OUT | PHY_GCR_BIT_CLK_OUT));
		lvds_clear(lvds, lvds->secondary->base + lvds->secondary->ofs.PLLCR1,
			   PHY_PLLCR1_PLL_EN);
		lvds_clear(lvds, lvds->secondary->base + lvds->secondary->ofs.GCR,
			   PHY_GCR_DIV_RSTN | PHY_GCR_RSTZ);
	}

	clk_disable_unprepare(lvds->pllref_clk);
	clk_disable_unprepare(lvds->pclk);
}

static unsigned long lvds_pixel_clk_recalc_rate(struct clk_hw *hw,
						unsigned long parent_rate)
{
	struct stm_lvds *lvds = container_of(hw, struct stm_lvds, lvds_ck_px);
	struct drm_device *drm = lvds->lvds_bridge.dev;
	unsigned int pll_in_khz, bdiv, mdiv, ndiv;
	int ret, multiplier, pll_out_khz;
	u32 val;

	ret = clk_prepare_enable(lvds->pclk);
	if (ret) {
		drm_err(drm, "Failed to enable lvds peripheral clk\n");
		return 0;
	}

	if (lvds_is_dual_link(lvds->link_type))
		multiplier = 2;
	else
		multiplier = 1;

	val = lvds_read(lvds, lvds->primary->base + lvds->primary->ofs.PLLCR2);

	ndiv = (val & PHY_PLLCR2_NDIV) >> 16;
	bdiv = (val & PHY_PLLCR2_BDIV) >> 0;

	mdiv = (unsigned int)lvds_read(lvds,
				       lvds->primary->base + lvds->primary->ofs.PLLSDCR1);

	pll_in_khz = (unsigned int)(parent_rate / 1000);

	/* Compute values if not yet accessible */
	if (val == 0 || mdiv == 0) {
		lvds_pll_get_params(lvds, pll_in_khz,
				    lvds->pixel_clock_rate * 7 / 1000 / multiplier,
				    &bdiv, &mdiv, &ndiv);
	}

	pll_out_khz = pll_get_clkout_khz(pll_in_khz, bdiv, mdiv, ndiv);
	drm_dbg(drm, "ndiv %d , bdiv %d, mdiv %d, pll_out_khz %d\n",
		ndiv, bdiv, mdiv, pll_out_khz);

	/*
	 * 1/7 because for each pixel in 1 lane there is 7 bits
	 * We want pixclk, not bitclk
	 */
	lvds->pixel_clock_rate = pll_out_khz * 1000 * multiplier / 7;

	clk_disable_unprepare(lvds->pclk);

	return (unsigned long)lvds->pixel_clock_rate;
}

static long lvds_pixel_clk_round_rate(struct clk_hw *hw, unsigned long rate,
				      unsigned long *parent_rate)
{
	struct stm_lvds *lvds = container_of(hw, struct stm_lvds, lvds_ck_px);
	unsigned int pll_in_khz, bdiv = 0, mdiv = 0, ndiv = 0;
	const struct drm_connector *connector;
	const struct drm_display_mode *mode;
	int multiplier;

	connector = &lvds->connector;
	if (!connector)
		return -EINVAL;

	if (list_empty(&connector->modes)) {
		drm_dbg(connector->dev, "connector: empty modes list\n");
		return -EINVAL;
	}

	mode = list_first_entry(&connector->modes,
				struct drm_display_mode, head);

	pll_in_khz = (unsigned int)(*parent_rate / 1000);

	if (lvds_is_dual_link(lvds->link_type))
		multiplier = 2;
	else
		multiplier = 1;

	lvds_pll_get_params(lvds, pll_in_khz, mode->clock * 7 / multiplier, &bdiv, &mdiv, &ndiv);

	/*
	 * 1/7 because for each pixel in 1 lane there is 7 bits
	 * We want pixclk, not bitclk
	 */
	lvds->pixel_clock_rate = (unsigned long)pll_get_clkout_khz(pll_in_khz, bdiv, mdiv, ndiv)
					 * 1000 * multiplier / 7;

	return lvds->pixel_clock_rate;
}

static const struct clk_ops lvds_pixel_clk_ops = {
	.enable = lvds_pixel_clk_enable,
	.disable = lvds_pixel_clk_disable,
	.recalc_rate = lvds_pixel_clk_recalc_rate,
	.round_rate = lvds_pixel_clk_round_rate,
};

static const struct clk_init_data clk_data = {
	.name = "clk_pix_lvds",
	.ops = &lvds_pixel_clk_ops,
	.parent_names = (const char * []) {"ck_ker_lvdsphy"},
	.num_parents = 1,
	.flags = CLK_IGNORE_UNUSED,
};

static void lvds_pixel_clk_unregister(void *data)
{
	struct stm_lvds *lvds = data;

	of_clk_del_provider(lvds->dev->of_node);
	clk_hw_unregister(&lvds->lvds_ck_px);
}

static int lvds_pixel_clk_register(struct stm_lvds *lvds)
{
	struct device_node *node = lvds->dev->of_node;
	int ret;

	lvds->lvds_ck_px.init = &clk_data;

	/* set the rate by default at 148500000 */
	lvds->pixel_clock_rate = 148500000;

	ret = clk_hw_register(lvds->dev, &lvds->lvds_ck_px);
	if (ret)
		return ret;

	ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get,
				     &lvds->lvds_ck_px);
	if (ret)
		clk_hw_unregister(&lvds->lvds_ck_px);

	return ret;
}

/*
 * Host configuration related
 */
static void lvds_config_data_mapping(struct stm_lvds *lvds)
{
	struct drm_device *drm = lvds->lvds_bridge.dev;
	const struct drm_display_info *info;
	enum lvds_pixel (*bitmap)[7];
	u32 lvds_dmlcr, lvds_dmmcr;
	int i;

	info = &(&lvds->connector)->display_info;
	if (!info->num_bus_formats || !info->bus_formats) {
		drm_warn(drm, "No LVDS bus format reported\n");
		return;
	}

	switch (info->bus_formats[0]) {
	case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: /* VESA-RGB666 */
		drm_warn(drm, "Pixel format with data mapping not yet supported.\n");
		return;
	case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: /* VESA-RGB888 */
		bitmap = lvds_bitmap_vesa_rgb888;
		break;
	case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: /* JEIDA-RGB888 */
		bitmap = lvds_bitmap_jeida_rgb888;
		break;
	default:
		drm_warn(drm, "Unsupported LVDS bus format 0x%04x\n", info->bus_formats[0]);
		return;
	}

	/* Set bitmap for each lane */
	for (i = 0; i < 5; i++) {
		lvds_dmlcr = ((bitmap[i][0])
			      + (bitmap[i][1] << 5)
			      + (bitmap[i][2] << 10)
			      + (bitmap[i][3] << 15));
		lvds_dmmcr = ((bitmap[i][4])
			      + (bitmap[i][5] << 5)
			      + (bitmap[i][6] << 10));

		lvds_write(lvds, LVDS_DMLCR(i), lvds_dmlcr);
		lvds_write(lvds, LVDS_DMMCR(i), lvds_dmmcr);
	}
}

static void lvds_config_mode(struct stm_lvds *lvds)
{
	u32 bus_flags, lvds_cr = 0, lvds_cdl1cr = 0, lvds_cdl2cr = 0;
	const struct drm_display_mode *mode;
	const struct drm_connector *connector;

	connector = &lvds->connector;
	if (!connector)
		return;

	if (list_empty(&connector->modes)) {
		drm_dbg(connector->dev, "connector: empty modes list\n");
		return;
	}

	bus_flags = connector->display_info.bus_flags;
	mode = list_first_entry(&connector->modes,
				struct drm_display_mode, head);

	lvds_clear(lvds, LVDS_CR, CR_LKMOD);
	lvds_clear(lvds, LVDS_CDL1CR, CDLCR_DISTR0 | CDLCR_DISTR1 | CDLCR_DISTR2 |
				      CDLCR_DISTR3 | CDLCR_DISTR4);
	lvds_clear(lvds, LVDS_CDL2CR, CDLCR_DISTR0 | CDLCR_DISTR1 | CDLCR_DISTR2 |
				      CDLCR_DISTR3 | CDLCR_DISTR4);

	/* Set channel distribution */
	if (lvds->primary)
		lvds_cdl1cr = CDL1CR_DEFAULT;

	if (lvds->secondary) {
		lvds_cr |= CR_LKMOD;
		lvds_cdl2cr = CDL2CR_DEFAULT;
	}

	/* Set signal polarity */
	if (bus_flags & DRM_BUS_FLAG_DE_LOW)
		lvds_cr |= CR_DEPOL;

	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
		lvds_cr |= CR_HSPOL;

	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
		lvds_cr |= CR_VSPOL;

	switch (lvds->link_type) {
	case LVDS_DUAL_LINK_EVEN_ODD_PIXELS: /* LKPHA = 0 */
		lvds_cr &= ~CR_LKPHA;
		break;
	case LVDS_DUAL_LINK_ODD_EVEN_PIXELS: /* LKPHA = 1 */
		lvds_cr |= CR_LKPHA;
		break;
	default:
		drm_notice(lvds->lvds_bridge.dev, "No phase precised, setting default\n");
		lvds_cr &= ~CR_LKPHA;
		break;
	}

	/* Write config to registers */
	lvds_set(lvds, LVDS_CR, lvds_cr);
	lvds_write(lvds, LVDS_CDL1CR, lvds_cdl1cr);
	lvds_write(lvds, LVDS_CDL2CR, lvds_cdl2cr);
}

static int lvds_connector_get_modes(struct drm_connector *connector)
{
	struct stm_lvds *lvds = connector_to_stm_lvds(connector);

	return drm_panel_get_modes(lvds->panel, connector);
}

static int lvds_connector_atomic_check(struct drm_connector *connector,
				       struct drm_atomic_state *state)
{
	const struct drm_display_mode *panel_mode;
	struct drm_connector_state *conn_state;
	struct drm_crtc_state *crtc_state;

	conn_state = drm_atomic_get_new_connector_state(state, connector);
	if (!conn_state)
		return -EINVAL;

	if (list_empty(&connector->modes)) {
		drm_dbg(connector->dev, "connector: empty modes list\n");
		return -EINVAL;
	}

	if (!conn_state->crtc)
		return -EINVAL;

	panel_mode = list_first_entry(&connector->modes,
				      struct drm_display_mode, head);

	/* We're not allowed to modify the resolution. */
	crtc_state = drm_atomic_get_crtc_state(state, conn_state->crtc);
	if (IS_ERR(crtc_state))
		return PTR_ERR(crtc_state);

	if (crtc_state->mode.hdisplay != panel_mode->hdisplay ||
	    crtc_state->mode.vdisplay != panel_mode->vdisplay)
		return -EINVAL;

	/* The flat panel mode is fixed, just copy it to the adjusted mode. */
	drm_mode_copy(&crtc_state->adjusted_mode, panel_mode);

	return 0;
}

static const struct drm_connector_helper_funcs lvds_conn_helper_funcs = {
	.get_modes = lvds_connector_get_modes,
	.atomic_check = lvds_connector_atomic_check,
};

static const struct drm_connector_funcs lvds_conn_funcs = {
	.reset = drm_atomic_helper_connector_reset,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = drm_connector_cleanup,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int lvds_attach(struct drm_bridge *bridge,
		       enum drm_bridge_attach_flags flags)
{
	struct stm_lvds *lvds = bridge_to_stm_lvds(bridge);
	struct drm_connector *connector = &lvds->connector;
	struct drm_encoder *encoder = bridge->encoder;
	int ret;

	if (!bridge->encoder) {
		drm_err(bridge->dev, "Parent encoder object not found\n");
		return -ENODEV;
	}

	/* Set the encoder type as caller does not know it */
	bridge->encoder->encoder_type = DRM_MODE_ENCODER_LVDS;

	/* No cloning support */
	bridge->encoder->possible_clones = 0;

	/* If we have a next bridge just attach it. */
	if (lvds->next_bridge)
		return drm_bridge_attach(bridge->encoder, lvds->next_bridge,
					 bridge, flags);

	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
		drm_err(bridge->dev, "Fix bridge driver to make connector optional!");
		return -EINVAL;
	}

	/* Otherwise if we have a panel, create a connector. */
	if (!lvds->panel)
		return 0;

	ret = drm_connector_init(bridge->dev, connector,
				 &lvds_conn_funcs, DRM_MODE_CONNECTOR_LVDS);
	if (ret < 0)
		return ret;

	drm_connector_helper_add(connector, &lvds_conn_helper_funcs);

	ret = drm_connector_attach_encoder(connector, encoder);

	return ret;
}

static void lvds_atomic_enable(struct drm_bridge *bridge,
			       struct drm_bridge_state *old_bridge_state)
{
	struct drm_atomic_state *state = old_bridge_state->base.state;
	struct stm_lvds *lvds = bridge_to_stm_lvds(bridge);
	struct drm_connector_state *conn_state;
	struct drm_connector *connector;
	int ret;

	ret = clk_prepare_enable(lvds->pclk);
	if (ret) {
		drm_err(bridge->dev, "Failed to enable lvds peripheral clk\n");
		return;
	}

	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
	if (!connector)
		return;

	conn_state = drm_atomic_get_new_connector_state(state, connector);
	if (!conn_state)
		return;

	lvds_config_mode(lvds);

	/* Set Data Mapping */
	lvds_config_data_mapping(lvds);

	/* Turn the output on. */
	lvds_set(lvds, LVDS_CR, CR_LVDSEN);

	if (lvds->panel) {
		drm_panel_prepare(lvds->panel);
		drm_panel_enable(lvds->panel);
	}
}

static void lvds_atomic_disable(struct drm_bridge *bridge,
				struct drm_bridge_state *old_bridge_state)
{
	struct stm_lvds *lvds = bridge_to_stm_lvds(bridge);

	if (lvds->panel) {
		drm_panel_disable(lvds->panel);
		drm_panel_unprepare(lvds->panel);
	}

	/* Disable LVDS module */
	lvds_clear(lvds, LVDS_CR, CR_LVDSEN);

	clk_disable_unprepare(lvds->pclk);
}

static const struct drm_bridge_funcs lvds_bridge_funcs = {
	.attach = lvds_attach,
	.atomic_enable = lvds_atomic_enable,
	.atomic_disable = lvds_atomic_disable,
	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
	.atomic_reset = drm_atomic_helper_bridge_reset,
};

static int lvds_probe(struct platform_device *pdev)
{
	struct device_node *port1, *port2, *remote;
	struct device *dev = &pdev->dev;
	struct reset_control *rstc;
	struct stm_lvds *lvds;
	int ret, dual_link;

	dev_dbg(dev, "Probing LVDS driver...\n");

	lvds = devm_kzalloc(dev, sizeof(*lvds), GFP_KERNEL);
	if (!lvds)
		return -ENOMEM;

	lvds->dev = dev;

	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0,
					  &lvds->panel, &lvds->next_bridge);
	if (ret) {
		dev_err_probe(dev, ret, "Panel not found\n");
		return ret;
	}

	lvds->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(lvds->base)) {
		ret = PTR_ERR(lvds->base);
		dev_err(dev, "Unable to get regs %d\n", ret);
		return ret;
	}

	lvds->pclk = devm_clk_get(dev, "pclk");
	if (IS_ERR(lvds->pclk)) {
		ret = PTR_ERR(lvds->pclk);
		dev_err(dev, "Unable to get peripheral clock: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(lvds->pclk);
	if (ret) {
		dev_err(dev, "%s: Failed to enable peripheral clk\n", __func__);
		return ret;
	}

	rstc = devm_reset_control_get_exclusive(dev, NULL);

	if (IS_ERR(rstc)) {
		ret = PTR_ERR(rstc);
		goto err_lvds_probe;
	}

	reset_control_assert(rstc);
	usleep_range(10, 20);
	reset_control_deassert(rstc);

	port1 = of_graph_get_port_by_id(dev->of_node, 1);
	port2 = of_graph_get_port_by_id(dev->of_node, 2);
	dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);

	switch (dual_link) {
	case DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS:
		lvds->link_type = LVDS_DUAL_LINK_ODD_EVEN_PIXELS;
		lvds->primary = &lvds_phy_16ff_primary;
		lvds->secondary = &lvds_phy_16ff_secondary;
		break;
	case DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS:
		lvds->link_type = LVDS_DUAL_LINK_EVEN_ODD_PIXELS;
		lvds->primary = &lvds_phy_16ff_primary;
		lvds->secondary = &lvds_phy_16ff_secondary;
		break;
	case -EINVAL:
		/*
		 * drm_of_lvds_get_dual_pixel_order returns 4 possible values.
		 * In the case where the returned value is an error, it can be
		 * either ENODEV or EINVAL. Seeing the structure of this
		 * function, EINVAL means that either port1 or port2 is not
		 * present in the device tree.
		 * In that case, the lvds panel can be a single link panel, or
		 * there is a semantical error in the device tree code.
		 */
		remote = of_get_next_available_child(port1, NULL);
		if (remote) {
			if (of_graph_get_remote_endpoint(remote)) {
				lvds->link_type = LVDS_SINGLE_LINK_PRIMARY;
				lvds->primary = &lvds_phy_16ff_primary;
				lvds->secondary = NULL;
			} else {
				ret = -EINVAL;
			}

			of_node_put(remote);
		}

		remote = of_get_next_available_child(port2, NULL);
		if (remote) {
			if (of_graph_get_remote_endpoint(remote)) {
				lvds->link_type = LVDS_SINGLE_LINK_SECONDARY;
				lvds->primary = NULL;
				lvds->secondary = &lvds_phy_16ff_secondary;
			} else {
				ret = (ret == -EINVAL) ? -EINVAL : 0;
			}

			of_node_put(remote);
		}
		break;
	default:
		ret = -EINVAL;
		goto err_lvds_probe;
	}
	of_node_put(port1);
	of_node_put(port2);

	lvds->pllref_clk = devm_clk_get(dev, "ref");
	if (IS_ERR(lvds->pllref_clk)) {
		ret = PTR_ERR(lvds->pllref_clk);
		dev_err(dev, "Unable to get reference clock: %d\n", ret);
		goto err_lvds_probe;
	}

	ret = lvds_pixel_clk_register(lvds);
	if (ret) {
		dev_err(dev, "Failed to register LVDS pixel clock: %d\n", ret);
		goto err_lvds_probe;
	}

	lvds->lvds_bridge.funcs = &lvds_bridge_funcs;
	lvds->lvds_bridge.of_node = dev->of_node;
	lvds->hw_version = lvds_read(lvds, LVDS_VERR);

	dev_info(dev, "version 0x%02x initialized\n", lvds->hw_version);

	drm_bridge_add(&lvds->lvds_bridge);

	platform_set_drvdata(pdev, lvds);

	clk_disable_unprepare(lvds->pclk);

	return 0;

err_lvds_probe:
	clk_disable_unprepare(lvds->pclk);

	return ret;
}

static void lvds_remove(struct platform_device *pdev)
{
	struct stm_lvds *lvds = platform_get_drvdata(pdev);

	lvds_pixel_clk_unregister(lvds);

	drm_bridge_remove(&lvds->lvds_bridge);
}

static const struct of_device_id lvds_dt_ids[] = {
	{
		.compatible = "st,stm32mp25-lvds",
		.data = NULL
	},
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(of, lvds_dt_ids);

static struct platform_driver lvds_platform_driver = {
	.probe = lvds_probe,
	.remove = lvds_remove,
	.driver = {
		.name = "stm32-display-lvds",
		.of_match_table = lvds_dt_ids,
	},
};

module_platform_driver(lvds_platform_driver);

MODULE_AUTHOR("Raphaël Gallais-Pou <raphael.gallais-pou@foss.st.com>");
MODULE_AUTHOR("Philippe Cornu <philippe.cornu@foss.st.com>");
MODULE_AUTHOR("Yannick Fertre <yannick.fertre@foss.st.com>");
MODULE_DESCRIPTION("STMicroelectronics LVDS Display Interface Transmitter DRM driver");
MODULE_LICENSE("GPL");