1 files changed, 910 insertions, 0 deletions

diff --git a/drivers/video/fbdev/mxc/ldb.c b/drivers/video/fbdev/mxc/ldb.c
new file mode 100644
index 000000000000..1d6c9e08590c
--- /dev/null
+++ b/drivers/video/fbdev/mxc/ldb.c
@@ -0,0 +1,910 @@
+/*
+ * Copyright (C) 2012-2015 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+#include "mxc_dispdrv.h"
+
+#define DRIVER_NAME	"ldb"
+
+#define LDB_BGREF_RMODE_INT		(0x1 << 15)
+
+#define LDB_DI1_VS_POL_ACT_LOW		(0x1 << 10)
+#define LDB_DI0_VS_POL_ACT_LOW		(0x1 << 9)
+
+#define LDB_BIT_MAP_CH1_JEIDA		(0x1 << 8)
+#define LDB_BIT_MAP_CH0_JEIDA		(0x1 << 6)
+
+#define LDB_DATA_WIDTH_CH1_24		(0x1 << 7)
+#define LDB_DATA_WIDTH_CH0_24		(0x1 << 5)
+
+#define LDB_CH1_MODE_MASK		(0x3 << 2)
+#define LDB_CH1_MODE_EN_TO_DI1		(0x3 << 2)
+#define LDB_CH1_MODE_EN_TO_DI0		(0x1 << 2)
+#define LDB_CH0_MODE_MASK		(0x3 << 0)
+#define LDB_CH0_MODE_EN_TO_DI1		(0x3 << 0)
+#define LDB_CH0_MODE_EN_TO_DI0		(0x1 << 0)
+
+#define LDB_SPLIT_MODE_EN		(0x1 << 4)
+
+#define INVALID_BUS_REG			(~0UL)
+
+struct crtc_mux {
+	enum crtc crtc;
+	u32 val;
+};
+
+struct bus_mux {
+	int reg;
+	int shift;
+	int mask;
+	int crtc_mux_num;
+	const struct crtc_mux *crtcs;
+};
+
+struct ldb_info {
+	bool split_cap;
+	bool dual_cap;
+	bool ext_bgref_cap;
+	bool clk_fixup;
+	int ctrl_reg;
+	int bus_mux_num;
+	const struct bus_mux *buses;
+};
+
+struct ldb_data;
+
+struct ldb_chan {
+	struct ldb_data *ldb;
+	struct fb_info *fbi;
+	struct videomode vm;
+	enum crtc crtc;
+	int chno;
+	bool is_used;
+	bool online;
+};
+
+struct ldb_data {
+	struct regmap *regmap;
+	struct device *dev;
+	struct mxc_dispdrv_handle *mddh;
+	struct ldb_chan chan[2];
+	int bus_mux_num;
+	const struct bus_mux *buses;
+	int primary_chno;
+	int ctrl_reg;
+	u32 ctrl;
+	bool spl_mode;
+	bool dual_mode;
+	bool clk_fixup;
+	struct clk *di_clk[4];
+	struct clk *ldb_di_clk[2];
+	struct clk *div_3_5_clk[2];
+	struct clk *div_7_clk[2];
+	struct clk *div_sel_clk[2];
+};
+
+static const struct crtc_mux imx6q_lvds0_crtc_mux[] = {
+	{
+		.crtc = CRTC_IPU1_DI0,
+		.val = IMX6Q_GPR3_LVDS0_MUX_CTL_IPU1_DI0,
+	}, {
+		.crtc = CRTC_IPU1_DI1,
+		.val = IMX6Q_GPR3_LVDS0_MUX_CTL_IPU1_DI1,
+	}, {
+		.crtc = CRTC_IPU2_DI0,
+		.val = IMX6Q_GPR3_LVDS0_MUX_CTL_IPU2_DI0,
+	}, {
+		.crtc = CRTC_IPU2_DI1,
+		.val = IMX6Q_GPR3_LVDS0_MUX_CTL_IPU2_DI1,
+	}
+};
+
+static const struct crtc_mux imx6q_lvds1_crtc_mux[] = {
+	{
+		.crtc = CRTC_IPU1_DI0,
+		.val = IMX6Q_GPR3_LVDS1_MUX_CTL_IPU1_DI0,
+	}, {
+		.crtc = CRTC_IPU1_DI1,
+		.val = IMX6Q_GPR3_LVDS1_MUX_CTL_IPU1_DI1,
+	}, {
+		.crtc = CRTC_IPU2_DI0,
+		.val = IMX6Q_GPR3_LVDS1_MUX_CTL_IPU2_DI0,
+	}, {
+		.crtc = CRTC_IPU2_DI1,
+		.val = IMX6Q_GPR3_LVDS1_MUX_CTL_IPU2_DI1,
+	}
+};
+
+static const struct bus_mux imx6q_ldb_buses[] = {
+	{
+		.reg = IOMUXC_GPR3,
+		.shift = 6,
+		.mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
+		.crtc_mux_num = ARRAY_SIZE(imx6q_lvds0_crtc_mux),
+		.crtcs = imx6q_lvds0_crtc_mux,
+	}, {
+		.reg = IOMUXC_GPR3,
+		.shift = 8,
+		.mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
+		.crtc_mux_num = ARRAY_SIZE(imx6q_lvds1_crtc_mux),
+		.crtcs = imx6q_lvds1_crtc_mux,
+	}
+};
+
+static const struct ldb_info imx6q_ldb_info = {
+	.split_cap = true,
+	.dual_cap = true,
+	.ext_bgref_cap = false,
+	.clk_fixup = false,
+	.ctrl_reg = IOMUXC_GPR2,
+	.bus_mux_num = ARRAY_SIZE(imx6q_ldb_buses),
+	.buses = imx6q_ldb_buses,
+};
+
+static const struct ldb_info imx6qp_ldb_info = {
+	.split_cap = true,
+	.dual_cap = true,
+	.ext_bgref_cap = false,
+	.clk_fixup = true,
+	.ctrl_reg = IOMUXC_GPR2,
+	.bus_mux_num = ARRAY_SIZE(imx6q_ldb_buses),
+	.buses = imx6q_ldb_buses,
+};
+
+static const struct crtc_mux imx6dl_lvds0_crtc_mux[] = {
+	{
+		.crtc = CRTC_IPU1_DI0,
+		.val = IMX6DL_GPR3_LVDS0_MUX_CTL_IPU1_DI0,
+	}, {
+		.crtc = CRTC_IPU1_DI1,
+		.val = IMX6DL_GPR3_LVDS0_MUX_CTL_IPU1_DI1,
+	}, {
+		.crtc = CRTC_LCDIF1,
+		.val = IMX6DL_GPR3_LVDS0_MUX_CTL_LCDIF,
+	}
+};
+
+static const struct crtc_mux imx6dl_lvds1_crtc_mux[] = {
+	{
+		.crtc = CRTC_IPU1_DI0,
+		.val = IMX6DL_GPR3_LVDS1_MUX_CTL_IPU1_DI0,
+	}, {
+		.crtc = CRTC_IPU1_DI1,
+		.val = IMX6DL_GPR3_LVDS1_MUX_CTL_IPU1_DI1,
+	}, {
+		.crtc = CRTC_LCDIF1,
+		.val = IMX6DL_GPR3_LVDS1_MUX_CTL_LCDIF,
+	}
+};
+
+static const struct bus_mux imx6dl_ldb_buses[] = {
+	{
+		.reg = IOMUXC_GPR3,
+		.shift = 6,
+		.mask = IMX6DL_GPR3_LVDS0_MUX_CTL_MASK,
+		.crtc_mux_num = ARRAY_SIZE(imx6dl_lvds0_crtc_mux),
+		.crtcs = imx6dl_lvds0_crtc_mux,
+	}, {
+		.reg = IOMUXC_GPR3,
+		.shift = 8,
+		.mask = IMX6DL_GPR3_LVDS1_MUX_CTL_MASK,
+		.crtc_mux_num = ARRAY_SIZE(imx6dl_lvds1_crtc_mux),
+		.crtcs = imx6dl_lvds1_crtc_mux,
+	}
+};
+
+static const struct ldb_info imx6dl_ldb_info = {
+	.split_cap = true,
+	.dual_cap = true,
+	.ext_bgref_cap = false,
+	.clk_fixup = false,
+	.ctrl_reg = IOMUXC_GPR2,
+	.bus_mux_num = ARRAY_SIZE(imx6dl_ldb_buses),
+	.buses = imx6dl_ldb_buses,
+};
+
+static const struct crtc_mux imx6sx_lvds_crtc_mux[] = {
+	{
+		.crtc = CRTC_LCDIF1,
+		.val = IMX6SX_GPR5_DISP_MUX_LDB_CTRL_LCDIF1,
+	}, {
+		.crtc = CRTC_LCDIF2,
+		.val = IMX6SX_GPR5_DISP_MUX_LDB_CTRL_LCDIF2,
+	}
+};
+
+static const struct bus_mux imx6sx_ldb_buses[] = {
+	{
+		.reg = IOMUXC_GPR5,
+		.shift = 3,
+		.mask = IMX6SX_GPR5_DISP_MUX_LDB_CTRL_MASK,
+		.crtc_mux_num = ARRAY_SIZE(imx6sx_lvds_crtc_mux),
+		.crtcs = imx6sx_lvds_crtc_mux,
+	}
+};
+
+static const struct ldb_info imx6sx_ldb_info = {
+	.split_cap = false,
+	.dual_cap = false,
+	.ext_bgref_cap = false,
+	.clk_fixup = false,
+	.ctrl_reg = IOMUXC_GPR6,
+	.bus_mux_num = ARRAY_SIZE(imx6sx_ldb_buses),
+	.buses = imx6sx_ldb_buses,
+};
+
+static const struct crtc_mux imx53_lvds0_crtc_mux[] = {
+	{ .crtc = CRTC_IPU1_DI0, },
+};
+
+static const struct crtc_mux imx53_lvds1_crtc_mux[] = {
+	{ .crtc = CRTC_IPU1_DI1, }
+};
+
+static const struct bus_mux imx53_ldb_buses[] = {
+	{
+		.reg = INVALID_BUS_REG,
+		.crtc_mux_num = ARRAY_SIZE(imx53_lvds0_crtc_mux),
+		.crtcs = imx53_lvds0_crtc_mux,
+	}, {
+		.reg = INVALID_BUS_REG,
+		.crtc_mux_num = ARRAY_SIZE(imx53_lvds1_crtc_mux),
+		.crtcs = imx53_lvds1_crtc_mux,
+	}
+};
+
+static const struct ldb_info imx53_ldb_info = {
+	.split_cap = true,
+	.dual_cap = false,
+	.ext_bgref_cap = true,
+	.clk_fixup = false,
+	.ctrl_reg = IOMUXC_GPR2,
+	.bus_mux_num = ARRAY_SIZE(imx53_ldb_buses),
+	.buses = imx53_ldb_buses,
+};
+
+static const struct of_device_id ldb_dt_ids[] = {
+	{ .compatible = "fsl,imx6qp-ldb", .data = &imx6qp_ldb_info, },
+	{ .compatible = "fsl,imx6q-ldb", .data = &imx6q_ldb_info, },
+	{ .compatible = "fsl,imx6dl-ldb", .data = &imx6dl_ldb_info, },
+	{ .compatible = "fsl,imx6sx-ldb", .data = &imx6sx_ldb_info, },
+	{ .compatible = "fsl,imx53-ldb", .data = &imx53_ldb_info, },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ldb_dt_ids);
+
+static int ldb_init(struct mxc_dispdrv_handle *mddh,
+		    struct mxc_dispdrv_setting *setting)
+{
+	struct ldb_data *ldb = mxc_dispdrv_getdata(mddh);
+	struct device *dev = ldb->dev;
+	struct fb_info *fbi = setting->fbi;
+	struct ldb_chan *chan;
+	struct fb_videomode fb_vm;
+	int chno;
+
+	chno = ldb->chan[ldb->primary_chno].is_used ?
+		!ldb->primary_chno : ldb->primary_chno;
+
+	chan = &ldb->chan[chno];
+
+	if (chan->is_used) {
+		dev_err(dev, "LVDS channel%d is already used\n", chno);
+		return -EBUSY;
+	}
+	if (!chan->online) {
+		dev_err(dev, "LVDS channel%d is not online\n", chno);
+		return -ENODEV;
+	}
+
+	chan->is_used = true;
+
+	chan->fbi = fbi;
+
+	fb_videomode_from_videomode(&chan->vm, &fb_vm);
+	fb_videomode_to_var(&fbi->var, &fb_vm);
+
+	setting->crtc = chan->crtc;
+
+	return 0;
+}
+
+static int get_di_clk_id(struct ldb_chan chan, int *id)
+{
+	struct ldb_data *ldb = chan.ldb;
+	int i = 0, chno = chan.chno, mask, shift;
+	enum crtc crtc;
+	u32 val;
+
+	/* no pre-muxing, such as mx53 */
+	if (ldb->buses[chno].reg == INVALID_BUS_REG) {
+		*id = chno;
+		return 0;
+	}
+
+	for (; i < ldb->buses[chno].crtc_mux_num; i++) {
+		crtc = ldb->buses[chno].crtcs[i].crtc;
+		val  = ldb->buses[chno].crtcs[i].val;
+		mask = ldb->buses[chno].mask;
+		shift = ldb->buses[chno].shift;
+		if (chan.crtc == crtc) {
+			*id = (val & mask) >> shift;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int get_mux_val(struct bus_mux bus_mux, enum crtc crtc,
+		       u32 *mux_val)
+{
+	int i = 0;
+
+	for (; i < bus_mux.crtc_mux_num; i++)
+		if (bus_mux.crtcs[i].crtc == crtc) {
+			*mux_val = bus_mux.crtcs[i].val;
+			return 0;
+		}
+
+	return -EINVAL;
+}
+
+static int find_ldb_chno(struct ldb_data *ldb,
+			 struct fb_info *fbi, int *chno)
+{
+	struct device *dev = ldb->dev;
+	int i = 0;
+
+	for (; i < 2; i++)
+		if (ldb->chan[i].fbi == fbi) {
+			*chno = ldb->chan[i].chno;
+			return 0;
+		}
+	dev_err(dev, "failed to find channel number\n");
+	return -EINVAL;
+}
+
+static void ldb_disable(struct mxc_dispdrv_handle *mddh,
+			struct fb_info *fbi);
+
+static int ldb_setup(struct mxc_dispdrv_handle *mddh,
+		     struct fb_info *fbi)
+{
+	struct ldb_data *ldb = mxc_dispdrv_getdata(mddh);
+	struct ldb_chan chan;
+	struct device *dev = ldb->dev;
+	struct clk *ldb_di_parent, *ldb_di_sel, *ldb_di_sel_parent;
+	struct clk *other_ldb_di_sel = NULL;
+	struct bus_mux bus_mux;
+	int ret = 0, id = 0, chno, other_chno;
+	unsigned long serial_clk;
+	u32 mux_val;
+
+	ret = find_ldb_chno(ldb, fbi, &chno);
+	if (ret < 0)
+		return ret;
+
+	other_chno = chno ? 0 : 1;
+
+	chan = ldb->chan[chno];
+
+	bus_mux = ldb->buses[chno];
+
+	ret = get_di_clk_id(chan, &id);
+	if (ret < 0) {
+		dev_err(dev, "failed to get ch%d di clk id\n",
+			chan.chno);
+		return ret;
+	}
+
+	ret = get_mux_val(bus_mux, chan.crtc, &mux_val);
+	if (ret < 0) {
+		dev_err(dev, "failed to get ch%d mux val\n",
+			chan.chno);
+		return ret;
+	}
+
+
+	if (ldb->clk_fixup) {
+		/*
+		 * ldb_di_sel_parent(plls) -> ldb_di_sel -> ldb_di[chno] ->
+		 *
+		 *     -> div_3_5[chno] ->
+		 * -> |                   |-> div_sel[chno] -> di[id]
+		 *     ->  div_7[chno] ->
+		 */
+		clk_set_parent(ldb->di_clk[id], ldb->div_sel_clk[chno]);
+	} else {
+		/*
+		 * ldb_di_sel_parent(plls) -> ldb_di_sel ->
+		 *
+		 *     -> div_3_5[chno] ->
+		 * -> |                   |-> div_sel[chno] ->
+		 *     ->  div_7[chno] ->
+		 *
+		 * -> ldb_di[chno] -> di[id]
+		 */
+		clk_set_parent(ldb->di_clk[id], ldb->ldb_di_clk[chno]);
+	}
+	ldb_di_parent = ldb->spl_mode ? ldb->div_3_5_clk[chno] :
+			ldb->div_7_clk[chno];
+	clk_set_parent(ldb->div_sel_clk[chno], ldb_di_parent);
+	ldb_di_sel = clk_get_parent(ldb_di_parent);
+	ldb_di_sel_parent = clk_get_parent(ldb_di_sel);
+	serial_clk = ldb->spl_mode ? chan.vm.pixelclock * 7 / 2 :
+			chan.vm.pixelclock * 7;
+	clk_set_rate(ldb_di_sel_parent, serial_clk);
+
+	/*
+	 * split mode or dual mode:
+	 * clock tree for the other channel
+	 */
+	if (ldb->spl_mode) {
+		clk_set_parent(ldb->div_sel_clk[other_chno],
+			       ldb->div_3_5_clk[other_chno]);
+		other_ldb_di_sel =
+			clk_get_parent(ldb->div_3_5_clk[other_chno]);;
+	}
+
+	if (ldb->dual_mode) {
+		clk_set_parent(ldb->div_sel_clk[other_chno],
+			       ldb->div_7_clk[other_chno]);
+		other_ldb_di_sel =
+			clk_get_parent(ldb->div_7_clk[other_chno]);;
+	}
+
+	if (ldb->spl_mode || ldb->dual_mode)
+		clk_set_parent(other_ldb_di_sel, ldb_di_sel_parent);
+
+	if (!(chan.fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)) {
+		if (ldb->spl_mode && bus_mux.reg == INVALID_BUS_REG)
+			/* no pre-muxing, such as mx53 */
+			ldb->ctrl |= (id == 0 ? LDB_DI0_VS_POL_ACT_LOW :
+					LDB_DI1_VS_POL_ACT_LOW);
+		else
+			ldb->ctrl |= (chno == 0 ? LDB_DI0_VS_POL_ACT_LOW :
+					LDB_DI1_VS_POL_ACT_LOW);
+	}
+
+	if (bus_mux.reg != INVALID_BUS_REG)
+		regmap_update_bits(ldb->regmap, bus_mux.reg,
+				   bus_mux.mask, mux_val);
+
+	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ctrl);
+
+	/* disable channel for correct sequence */
+	ldb_disable(mddh, fbi);
+
+	return ret;
+}
+
+static int ldb_enable(struct mxc_dispdrv_handle *mddh,
+		      struct fb_info *fbi)
+{
+	struct ldb_data *ldb = mxc_dispdrv_getdata(mddh);
+	struct ldb_chan chan;
+	struct device *dev = ldb->dev;
+	struct bus_mux bus_mux;
+	int ret = 0, id = 0, chno, other_chno;
+
+	ret = find_ldb_chno(ldb, fbi, &chno);
+	if (ret < 0)
+		return ret;
+
+	chan = ldb->chan[chno];
+
+	bus_mux = ldb->buses[chno];
+
+	if (ldb->spl_mode || ldb->dual_mode) {
+		other_chno = chno ? 0 : 1;
+		clk_prepare_enable(ldb->ldb_di_clk[other_chno]);
+	}
+
+	if ((ldb->spl_mode || ldb->dual_mode) &&
+	    bus_mux.reg == INVALID_BUS_REG) {
+		/* no pre-muxing, such as mx53 */
+		ret = get_di_clk_id(chan, &id);
+		if (ret < 0) {
+			dev_err(dev, "failed to get ch%d di clk id\n",
+				chan.chno);
+			return ret;
+		}
+
+		ldb->ctrl |= id ?
+			(LDB_CH0_MODE_EN_TO_DI1 | LDB_CH1_MODE_EN_TO_DI1) :
+			(LDB_CH0_MODE_EN_TO_DI0 | LDB_CH1_MODE_EN_TO_DI0);
+	} else {
+		if (ldb->spl_mode || ldb->dual_mode)
+			ldb->ctrl |= LDB_CH0_MODE_EN_TO_DI0 |
+				     LDB_CH1_MODE_EN_TO_DI0;
+		else
+			ldb->ctrl |= chno ? LDB_CH1_MODE_EN_TO_DI1 :
+					    LDB_CH0_MODE_EN_TO_DI0;
+	}
+
+	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ctrl);
+	return 0;
+}
+
+static void ldb_disable(struct mxc_dispdrv_handle *mddh,
+		       struct fb_info *fbi)
+{
+	struct ldb_data *ldb = mxc_dispdrv_getdata(mddh);
+	int ret, chno, other_chno;
+
+	ret = find_ldb_chno(ldb, fbi, &chno);
+	if (ret < 0)
+		return;
+
+	if (ldb->spl_mode || ldb->dual_mode) {
+		ldb->ctrl &= ~(LDB_CH1_MODE_MASK | LDB_CH0_MODE_MASK);
+		other_chno = chno ? 0 : 1;
+		clk_disable_unprepare(ldb->ldb_di_clk[other_chno]);
+	} else {
+		ldb->ctrl &= ~(chno ? LDB_CH1_MODE_MASK :
+				      LDB_CH0_MODE_MASK);
+	}
+
+	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ctrl);
+	return;
+}
+
+static struct mxc_dispdrv_driver ldb_drv = {
+	.name		= DRIVER_NAME,
+	.init		= ldb_init,
+	.setup		= ldb_setup,
+	.enable		= ldb_enable,
+	.disable	= ldb_disable
+};
+
+enum {
+	LVDS_BIT_MAP_SPWG,
+	LVDS_BIT_MAP_JEIDA,
+};
+
+static const char *ldb_bit_mappings[] = {
+	[LVDS_BIT_MAP_SPWG] = "spwg",
+	[LVDS_BIT_MAP_JEIDA] = "jeida",
+};
+
+static int of_get_data_mapping(struct device_node *np)
+{
+	const char *bm;
+	int ret, i;
+
+	ret = of_property_read_string(np, "fsl,data-mapping", &bm);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(ldb_bit_mappings); i++)
+		if (!strcasecmp(bm, ldb_bit_mappings[i]))
+			return i;
+
+	return -EINVAL;
+}
+
+static const char *ldb_crtc_mappings[] = {
+	[CRTC_IPU_DI0] = "ipu-di0",
+	[CRTC_IPU_DI1] = "ipu-di1",
+	[CRTC_IPU1_DI0] = "ipu1-di0",
+	[CRTC_IPU1_DI1] = "ipu1-di1",
+	[CRTC_IPU2_DI0] = "ipu2-di0",
+	[CRTC_IPU2_DI1] = "ipu2-di1",
+	[CRTC_LCDIF] = "lcdif",
+	[CRTC_LCDIF1] = "lcdif1",
+	[CRTC_LCDIF2] = "lcdif2",
+};
+
+static enum crtc of_get_crtc_mapping(struct device_node *np)
+{
+	const char *cm;
+	enum crtc i;
+	int ret;
+
+	ret = of_property_read_string(np, "crtc", &cm);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(ldb_crtc_mappings); i++)
+		if (!strcasecmp(cm, ldb_crtc_mappings[i])) {
+			switch (i) {
+			case CRTC_IPU_DI0:
+				i = CRTC_IPU1_DI0;
+				break;
+			case CRTC_IPU_DI1:
+				i = CRTC_IPU1_DI1;
+				break;
+			case CRTC_LCDIF:
+				i = CRTC_LCDIF1;
+				break;
+			default:
+				break;
+			}
+			return i;
+		}
+
+	return -EINVAL;
+}
+
+static int mux_count(struct ldb_data *ldb)
+{
+	int i, j, count = 0;
+	bool should_count[CRTC_MAX];
+	enum crtc crtc;
+
+	for (i = 0; i < CRTC_MAX; i++)
+		should_count[i] = true;
+
+	for (i = 0; i < ldb->bus_mux_num; i++) {
+		for (j = 0; j < ldb->buses[i].crtc_mux_num; j++) {
+			crtc = ldb->buses[i].crtcs[j].crtc;
+			if (should_count[crtc]) {
+				count++;
+				should_count[crtc] = false;
+			}
+		}
+	}
+
+	return count;
+}
+
+static bool is_valid_crtc(struct ldb_data *ldb, enum crtc crtc,
+			  int chno)
+{
+	int i = 0;
+
+	if (chno > ldb->bus_mux_num - 1)
+		return false;
+
+	for (; i < ldb->buses[chno].crtc_mux_num; i++)
+		if (ldb->buses[chno].crtcs[i].crtc == crtc)
+			return true;
+
+	return false;
+}
+
+static int ldb_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *of_id =
+			of_match_device(ldb_dt_ids, dev);
+	const struct ldb_info *ldb_info =
+			(const struct ldb_info *)of_id->data;
+	struct device_node *np = dev->of_node, *child;
+	struct ldb_data *ldb;
+	bool ext_ref;
+	int i, data_width, mapping, child_count = 0;
+	char clkname[16];
+
+	ldb = devm_kzalloc(dev, sizeof(*ldb), GFP_KERNEL);
+	if (!ldb)
+		return -ENOMEM;
+
+	ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
+	if (IS_ERR(ldb->regmap)) {
+		dev_err(dev, "failed to get parent regmap\n");
+		return PTR_ERR(ldb->regmap);
+	}
+
+	ldb->dev = dev;
+	ldb->bus_mux_num = ldb_info->bus_mux_num;
+	ldb->buses = ldb_info->buses;
+	ldb->ctrl_reg = ldb_info->ctrl_reg;
+	ldb->clk_fixup = ldb_info->clk_fixup;
+	ldb->primary_chno = -1;
+
+	ext_ref = of_property_read_bool(np, "ext-ref");
+	if (!ext_ref && ldb_info->ext_bgref_cap)
+		ldb->ctrl |= LDB_BGREF_RMODE_INT;
+
+	ldb->spl_mode = of_property_read_bool(np, "split-mode");
+	if (ldb->spl_mode) {
+		if (ldb_info->split_cap) {
+			ldb->ctrl |= LDB_SPLIT_MODE_EN;
+			dev_info(dev, "split mode\n");
+		} else {
+			dev_err(dev, "cannot support split mode\n");
+			return -EINVAL;
+		}
+	}
+
+	ldb->dual_mode = of_property_read_bool(np, "dual-mode");
+	if (ldb->dual_mode) {
+		if (ldb_info->dual_cap) {
+			dev_info(dev, "dual mode\n");
+		} else {
+			dev_err(dev, "cannot support dual mode\n");
+			return -EINVAL;
+		}
+	}
+
+	if (ldb->dual_mode && ldb->spl_mode) {
+		dev_err(dev, "cannot support dual mode and split mode "
+				"simultaneously\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < mux_count(ldb); i++) {
+		sprintf(clkname, "di%d_sel", i);
+		ldb->di_clk[i] = devm_clk_get(dev, clkname);
+		if (IS_ERR(ldb->di_clk[i])) {
+			dev_err(dev, "failed to get clk %s\n", clkname);
+			return PTR_ERR(ldb->di_clk[i]);
+		}
+	}
+
+	for_each_child_of_node(np, child) {
+		struct ldb_chan *chan;
+		enum crtc crtc;
+		bool is_primary;
+		int ret;
+
+		ret = of_property_read_u32(child, "reg", &i);
+		if (ret || i < 0 || i > 1 || i >= ldb->bus_mux_num) {
+			dev_err(dev, "wrong LVDS channel number\n");
+			return -EINVAL;
+		}
+
+		if ((ldb->spl_mode || ldb->dual_mode) && i > 0) {
+			dev_warn(dev, "split mode or dual mode, ignoring "
+				"second output\n");
+			continue;
+		}
+
+		if (!of_device_is_available(child))
+			continue;
+
+		if (++child_count > ldb->bus_mux_num) {
+			dev_err(dev, "too many LVDS channels\n");
+			return -EINVAL;
+		}
+
+		chan = &ldb->chan[i];
+		chan->chno = i;
+		chan->ldb = ldb;
+		chan->online = true;
+
+		is_primary = of_property_read_bool(child, "primary");
+
+		if (ldb->bus_mux_num == 1 || (ldb->primary_chno == -1 &&
+		    (is_primary || ldb->spl_mode || ldb->dual_mode)))
+			ldb->primary_chno = chan->chno;
+
+		ret = of_property_read_u32(child, "fsl,data-width",
+					   &data_width);
+		if (ret || (data_width != 18 && data_width != 24)) {
+			dev_err(dev, "data width not specified or invalid\n");
+			return -EINVAL;
+		}
+
+		mapping = of_get_data_mapping(child);
+		switch (mapping) {
+		case LVDS_BIT_MAP_SPWG:
+			if (data_width == 24) {
+				if (i == 0 || ldb->spl_mode || ldb->dual_mode)
+					ldb->ctrl |= LDB_DATA_WIDTH_CH0_24;
+				if (i == 1 || ldb->spl_mode || ldb->dual_mode)
+					ldb->ctrl |= LDB_DATA_WIDTH_CH1_24;
+			}
+			break;
+		case LVDS_BIT_MAP_JEIDA:
+			if (data_width == 18) {
+				dev_err(dev, "JEIDA only support 24bit\n");
+				return -EINVAL;
+			}
+			if (i == 0 || ldb->spl_mode || ldb->dual_mode)
+				ldb->ctrl |= LDB_DATA_WIDTH_CH0_24 |
+					     LDB_BIT_MAP_CH0_JEIDA;
+			if (i == 1 || ldb->spl_mode || ldb->dual_mode)
+				ldb->ctrl |= LDB_DATA_WIDTH_CH1_24 |
+					     LDB_BIT_MAP_CH1_JEIDA;
+			break;
+		default:
+			dev_err(dev, "data mapping not specified or invalid\n");
+			return -EINVAL;
+		}
+
+		crtc = of_get_crtc_mapping(child);
+		if (is_valid_crtc(ldb, crtc, chan->chno)) {
+			ldb->chan[i].crtc = crtc;
+		} else {
+			dev_err(dev, "crtc not specified or invalid\n");
+			return -EINVAL;
+		}
+
+		ret = of_get_videomode(child, &chan->vm, 0);
+		if (ret)
+			return -EINVAL;
+
+		sprintf(clkname, "ldb_di%d", i);
+		ldb->ldb_di_clk[i] = devm_clk_get(dev, clkname);
+		if (IS_ERR(ldb->ldb_di_clk[i])) {
+			dev_err(dev, "failed to get clk %s\n", clkname);
+			return PTR_ERR(ldb->ldb_di_clk[i]);
+		}
+
+		sprintf(clkname, "ldb_di%d_div_3_5", i);
+		ldb->div_3_5_clk[i] = devm_clk_get(dev, clkname);
+		if (IS_ERR(ldb->div_3_5_clk[i])) {
+			dev_err(dev, "failed to get clk %s\n", clkname);
+			return PTR_ERR(ldb->div_3_5_clk[i]);
+		}
+
+		sprintf(clkname, "ldb_di%d_div_7", i);
+		ldb->div_7_clk[i] = devm_clk_get(dev, clkname);
+		if (IS_ERR(ldb->div_7_clk[i])) {
+			dev_err(dev, "failed to get clk %s\n", clkname);
+			return PTR_ERR(ldb->div_7_clk[i]);
+		}
+
+		sprintf(clkname, "ldb_di%d_div_sel", i);
+		ldb->div_sel_clk[i] = devm_clk_get(dev, clkname);
+		if (IS_ERR(ldb->div_sel_clk[i])) {
+			dev_err(dev, "failed to get clk %s\n", clkname);
+			return PTR_ERR(ldb->div_sel_clk[i]);
+		}
+	}
+
+	if (child_count == 0) {
+		dev_err(dev, "failed to find valid LVDS channel\n");
+		return -EINVAL;
+	}
+
+	if (ldb->primary_chno == -1) {
+		dev_err(dev, "failed to know primary channel\n");
+		return -EINVAL;
+	}
+
+	ldb->mddh = mxc_dispdrv_register(&ldb_drv);
+	mxc_dispdrv_setdata(ldb->mddh, ldb);
+	dev_set_drvdata(&pdev->dev, ldb);
+
+	return 0;
+}
+
+static int ldb_remove(struct platform_device *pdev)
+{
+	struct ldb_data *ldb = dev_get_drvdata(&pdev->dev);
+
+	mxc_dispdrv_puthandle(ldb->mddh);
+	mxc_dispdrv_unregister(ldb->mddh);
+	return 0;
+}
+
+static struct platform_driver ldb_driver = {
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table	= ldb_dt_ids,
+	},
+	.probe = ldb_probe,
+	.remove = ldb_remove,
+};
+
+module_platform_driver(ldb_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("LDB driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);