File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
new file mode 100644
index 0000000..abacc8f
--- /dev/null
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -0,0 +1,690 @@
+/*
+ * i.MX drm driver - LVDS display bridge
+ *
+ * Copyright (C) 2012 Sascha Hauer, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <drm/drmP.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <video/of_videomode.h>
+#include <linux/regmap.h>
+#include <linux/videodev2.h>
+
+#include "imx-drm.h"
+
+#define DRIVER_NAME "imx-ldb"
+
+#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
+#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
+#define LDB_CH0_MODE_EN_MASK (3 << 0)
+#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
+#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
+#define LDB_CH1_MODE_EN_MASK (3 << 2)
+#define LDB_SPLIT_MODE_EN (1 << 4)
+#define LDB_DATA_WIDTH_CH0_24 (1 << 5)
+#define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
+#define LDB_DATA_WIDTH_CH1_24 (1 << 7)
+#define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
+#define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
+#define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
+#define LDB_BGREF_RMODE_INT (1 << 15)
+
+#define con_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, connector)
+#define enc_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, encoder)
+
+struct imx_ldb;
+
+struct imx_ldb_channel {
+ struct imx_ldb *ldb;
+ struct drm_connector connector;
+ struct drm_encoder encoder;
+ struct drm_panel *panel;
+ struct device_node *child;
+ int chno;
+ void *edid;
+ int edid_len;
+ struct drm_display_mode mode;
+ int mode_valid;
+ int bus_format;
+};
+
+struct bus_mux {
+ int reg;
+ int shift;
+ int mask;
+};
+
+struct imx_ldb {
+ struct regmap *regmap;
+ struct device *dev;
+ struct imx_ldb_channel channel[2];
+ struct clk *clk[2]; /* our own clock */
+ struct clk *clk_sel[4]; /* parent of display clock */
+ struct clk *clk_parent[4]; /* original parent of clk_sel */
+ struct clk *clk_pll[2]; /* upstream clock we can adjust */
+ u32 ldb_ctrl;
+ const struct bus_mux *lvds_mux;
+};
+
+static enum drm_connector_status imx_ldb_connector_detect(
+ struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static int imx_ldb_connector_get_modes(struct drm_connector *connector)
+{
+ struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
+ int num_modes = 0;
+
+ if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
+ imx_ldb_ch->panel->funcs->get_modes) {
+ struct drm_display_info *di = &connector->display_info;
+
+ num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
+ if (!imx_ldb_ch->bus_format && di->num_bus_formats)
+ imx_ldb_ch->bus_format = di->bus_formats[0];
+ if (num_modes > 0)
+ return num_modes;
+ }
+
+ if (imx_ldb_ch->edid) {
+ drm_mode_connector_update_edid_property(connector,
+ imx_ldb_ch->edid);
+ num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
+ }
+
+ if (imx_ldb_ch->mode_valid) {
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_create(connector->dev);
+ if (!mode)
+ return -EINVAL;
+ drm_mode_copy(mode, &imx_ldb_ch->mode);
+ mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+ num_modes++;
+ }
+
+ return num_modes;
+}
+
+static struct drm_encoder *imx_ldb_connector_best_encoder(
+ struct drm_connector *connector)
+{
+ struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
+
+ return &imx_ldb_ch->encoder;
+}
+
+static void imx_ldb_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+}
+
+static bool imx_ldb_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
+ unsigned long serial_clk, unsigned long di_clk)
+{
+ int ret;
+
+ dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
+ clk_get_rate(ldb->clk_pll[chno]), serial_clk);
+ clk_set_rate(ldb->clk_pll[chno], serial_clk);
+
+ dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
+ clk_get_rate(ldb->clk_pll[chno]));
+
+ dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
+ clk_get_rate(ldb->clk[chno]),
+ (long int)di_clk);
+ clk_set_rate(ldb->clk[chno], di_clk);
+
+ dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
+ clk_get_rate(ldb->clk[chno]));
+
+ /* set display clock mux to LDB input clock */
+ ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
+ if (ret)
+ dev_err(ldb->dev,
+ "unable to set di%d parent clock to ldb_di%d\n", mux,
+ chno);
+}
+
+static void imx_ldb_encoder_prepare(struct drm_encoder *encoder)
+{
+ struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
+ u32 bus_format;
+
+ switch (imx_ldb_ch->bus_format) {
+ default:
+ dev_warn(ldb->dev,
+ "could not determine data mapping, default to 18-bit \"spwg\"\n");
+ /* fallthrough */
+ case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+ bus_format = MEDIA_BUS_FMT_RGB666_1X18;
+ break;
+ case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+ bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ if (imx_ldb_ch->chno == 0 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
+ if (imx_ldb_ch->chno == 1 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
+ break;
+ case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+ bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ if (imx_ldb_ch->chno == 0 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
+ LDB_BIT_MAP_CH0_JEIDA;
+ if (imx_ldb_ch->chno == 1 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
+ LDB_BIT_MAP_CH1_JEIDA;
+ break;
+ }
+
+ imx_drm_set_bus_format(encoder, bus_format);
+}
+
+static void imx_ldb_encoder_commit(struct drm_encoder *encoder)
+{
+ struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
+ int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
+
+ drm_panel_prepare(imx_ldb_ch->panel);
+
+ if (dual) {
+ clk_prepare_enable(ldb->clk[0]);
+ clk_prepare_enable(ldb->clk[1]);
+ }
+
+ if (imx_ldb_ch == &ldb->channel[0] || dual) {
+ ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
+ if (mux == 0 || ldb->lvds_mux)
+ ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
+ else if (mux == 1)
+ ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
+ }
+ if (imx_ldb_ch == &ldb->channel[1] || dual) {
+ ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
+ if (mux == 1 || ldb->lvds_mux)
+ ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
+ else if (mux == 0)
+ ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
+ }
+
+ if (ldb->lvds_mux) {
+ const struct bus_mux *lvds_mux = NULL;
+
+ if (imx_ldb_ch == &ldb->channel[0])
+ lvds_mux = &ldb->lvds_mux[0];
+ else if (imx_ldb_ch == &ldb->channel[1])
+ lvds_mux = &ldb->lvds_mux[1];
+
+ regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
+ mux << lvds_mux->shift);
+ }
+
+ regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
+
+ drm_panel_enable(imx_ldb_ch->panel);
+}
+
+static void imx_ldb_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *orig_mode,
+ struct drm_display_mode *mode)
+{
+ struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
+ unsigned long serial_clk;
+ unsigned long di_clk = mode->clock * 1000;
+ int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
+
+ if (mode->clock > 170000) {
+ dev_warn(ldb->dev,
+ "%s: mode exceeds 170 MHz pixel clock\n", __func__);
+ }
+ if (mode->clock > 85000 && !dual) {
+ dev_warn(ldb->dev,
+ "%s: mode exceeds 85 MHz pixel clock\n", __func__);
+ }
+
+ if (dual) {
+ serial_clk = 3500UL * mode->clock;
+ imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
+ imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
+ } else {
+ serial_clk = 7000UL * mode->clock;
+ imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
+ di_clk);
+ }
+
+ /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
+ if (imx_ldb_ch == &ldb->channel[0]) {
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
+ else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+ ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
+ }
+ if (imx_ldb_ch == &ldb->channel[1]) {
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
+ else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+ ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
+ }
+}
+
+static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
+{
+ struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int mux, ret;
+
+ /*
+ * imx_ldb_encoder_disable is called by
+ * drm_helper_disable_unused_functions without
+ * the encoder being enabled before.
+ */
+ if (imx_ldb_ch == &ldb->channel[0] &&
+ (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
+ return;
+ else if (imx_ldb_ch == &ldb->channel[1] &&
+ (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
+ return;
+
+ drm_panel_disable(imx_ldb_ch->panel);
+
+ if (imx_ldb_ch == &ldb->channel[0])
+ ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
+ else if (imx_ldb_ch == &ldb->channel[1])
+ ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
+
+ regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
+
+ if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
+ clk_disable_unprepare(ldb->clk[0]);
+ clk_disable_unprepare(ldb->clk[1]);
+ }
+
+ if (ldb->lvds_mux) {
+ const struct bus_mux *lvds_mux = NULL;
+
+ if (imx_ldb_ch == &ldb->channel[0])
+ lvds_mux = &ldb->lvds_mux[0];
+ else if (imx_ldb_ch == &ldb->channel[1])
+ lvds_mux = &ldb->lvds_mux[1];
+
+ regmap_read(ldb->regmap, lvds_mux->reg, &mux);
+ mux &= lvds_mux->mask;
+ mux >>= lvds_mux->shift;
+ } else {
+ mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
+ }
+
+ /* set display clock mux back to original input clock */
+ ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
+ if (ret)
+ dev_err(ldb->dev,
+ "unable to set di%d parent clock to original parent\n",
+ mux);
+
+ drm_panel_unprepare(imx_ldb_ch->panel);
+}
+
+static struct drm_connector_funcs imx_ldb_connector_funcs = {
+ .dpms = drm_helper_connector_dpms,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = imx_ldb_connector_detect,
+ .destroy = imx_drm_connector_destroy,
+};
+
+static struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
+ .get_modes = imx_ldb_connector_get_modes,
+ .best_encoder = imx_ldb_connector_best_encoder,
+};
+
+static struct drm_encoder_funcs imx_ldb_encoder_funcs = {
+ .destroy = imx_drm_encoder_destroy,
+};
+
+static struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
+ .dpms = imx_ldb_encoder_dpms,
+ .mode_fixup = imx_ldb_encoder_mode_fixup,
+ .prepare = imx_ldb_encoder_prepare,
+ .commit = imx_ldb_encoder_commit,
+ .mode_set = imx_ldb_encoder_mode_set,
+ .disable = imx_ldb_encoder_disable,
+};
+
+static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
+{
+ char clkname[16];
+
+ snprintf(clkname, sizeof(clkname), "di%d", chno);
+ ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
+ if (IS_ERR(ldb->clk[chno]))
+ return PTR_ERR(ldb->clk[chno]);
+
+ snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
+ ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
+
+ return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
+}
+
+static int imx_ldb_register(struct drm_device *drm,
+ struct imx_ldb_channel *imx_ldb_ch)
+{
+ struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int ret;
+
+ ret = imx_drm_encoder_parse_of(drm, &imx_ldb_ch->encoder,
+ imx_ldb_ch->child);
+ if (ret)
+ return ret;
+
+ ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
+ if (ret)
+ return ret;
+
+ if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
+ ret = imx_ldb_get_clk(ldb, 1);
+ if (ret)
+ return ret;
+ }
+
+ drm_encoder_helper_add(&imx_ldb_ch->encoder,
+ &imx_ldb_encoder_helper_funcs);
+ drm_encoder_init(drm, &imx_ldb_ch->encoder, &imx_ldb_encoder_funcs,
+ DRM_MODE_ENCODER_LVDS);
+
+ drm_connector_helper_add(&imx_ldb_ch->connector,
+ &imx_ldb_connector_helper_funcs);
+ drm_connector_init(drm, &imx_ldb_ch->connector,
+ &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
+
+ if (imx_ldb_ch->panel)
+ drm_panel_attach(imx_ldb_ch->panel, &imx_ldb_ch->connector);
+
+ drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
+ &imx_ldb_ch->encoder);
+
+ return 0;
+}
+
+enum {
+ LVDS_BIT_MAP_SPWG,
+ LVDS_BIT_MAP_JEIDA
+};
+
+struct imx_ldb_bit_mapping {
+ u32 bus_format;
+ u32 datawidth;
+ const char * const mapping;
+};
+
+static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
+ { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" },
+ { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" },
+ { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
+};
+
+static u32 of_get_bus_format(struct device *dev, struct device_node *np)
+{
+ const char *bm;
+ u32 datawidth = 0;
+ int ret, i;
+
+ ret = of_property_read_string(np, "fsl,data-mapping", &bm);
+ if (ret < 0)
+ return ret;
+
+ of_property_read_u32(np, "fsl,data-width", &datawidth);
+
+ for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
+ if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
+ datawidth == imx_ldb_bit_mappings[i].datawidth)
+ return imx_ldb_bit_mappings[i].bus_format;
+ }
+
+ dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
+
+ return -ENOENT;
+}
+
+static struct bus_mux imx6q_lvds_mux[2] = {
+ {
+ .reg = IOMUXC_GPR3,
+ .shift = 6,
+ .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
+ }, {
+ .reg = IOMUXC_GPR3,
+ .shift = 8,
+ .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
+ }
+};
+
+/*
+ * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
+ * of_match_device will walk through this list and take the first entry
+ * matching any of its compatible values. Therefore, the more generic
+ * entries (in this case fsl,imx53-ldb) need to be ordered last.
+ */
+static const struct of_device_id imx_ldb_dt_ids[] = {
+ { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
+ { .compatible = "fsl,imx53-ldb", .data = NULL, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
+
+static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
+{
+ struct drm_device *drm = data;
+ struct device_node *np = dev->of_node;
+ const struct of_device_id *of_id =
+ of_match_device(imx_ldb_dt_ids, dev);
+ struct device_node *child;
+ const u8 *edidp;
+ struct imx_ldb *imx_ldb;
+ int dual;
+ int ret;
+ int i;
+
+ imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
+ if (!imx_ldb)
+ return -ENOMEM;
+
+ imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
+ if (IS_ERR(imx_ldb->regmap)) {
+ dev_err(dev, "failed to get parent regmap\n");
+ return PTR_ERR(imx_ldb->regmap);
+ }
+
+ imx_ldb->dev = dev;
+
+ if (of_id)
+ imx_ldb->lvds_mux = of_id->data;
+
+ dual = of_property_read_bool(np, "fsl,dual-channel");
+ if (dual)
+ imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
+
+ /*
+ * There are three different possible clock mux configurations:
+ * i.MX53: ipu1_di0_sel, ipu1_di1_sel
+ * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
+ * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
+ * Map them all to di0_sel...di3_sel.
+ */
+ for (i = 0; i < 4; i++) {
+ char clkname[16];
+
+ sprintf(clkname, "di%d_sel", i);
+ imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
+ if (IS_ERR(imx_ldb->clk_sel[i])) {
+ ret = PTR_ERR(imx_ldb->clk_sel[i]);
+ imx_ldb->clk_sel[i] = NULL;
+ break;
+ }
+
+ imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
+ }
+ if (i == 0)
+ return ret;
+
+ for_each_child_of_node(np, child) {
+ struct imx_ldb_channel *channel;
+ struct device_node *port;
+
+ ret = of_property_read_u32(child, "reg", &i);
+ if (ret || i < 0 || i > 1)
+ return -EINVAL;
+
+ if (dual && i > 0) {
+ dev_warn(dev, "dual-channel mode, ignoring second output\n");
+ continue;
+ }
+
+ if (!of_device_is_available(child))
+ continue;
+
+ channel = &imx_ldb->channel[i];
+ channel->ldb = imx_ldb;
+ channel->chno = i;
+ channel->child = child;
+
+ /*
+ * The output port is port@4 with an external 4-port mux or
+ * port@2 with the internal 2-port mux.
+ */
+ port = of_graph_get_port_by_id(child, imx_ldb->lvds_mux ? 4 : 2);
+ if (port) {
+ struct device_node *endpoint, *remote;
+
+ endpoint = of_get_child_by_name(port, "endpoint");
+ if (endpoint) {
+ remote = of_graph_get_remote_port_parent(endpoint);
+ if (remote)
+ channel->panel = of_drm_find_panel(remote);
+ else
+ return -EPROBE_DEFER;
+ if (!channel->panel) {
+ dev_err(dev, "panel not found: %s\n",
+ remote->full_name);
+ return -EPROBE_DEFER;
+ }
+ }
+ }
+
+ edidp = of_get_property(child, "edid", &channel->edid_len);
+ if (edidp) {
+ channel->edid = kmemdup(edidp, channel->edid_len,
+ GFP_KERNEL);
+ } else if (!channel->panel) {
+ ret = of_get_drm_display_mode(child, &channel->mode, 0);
+ if (!ret)
+ channel->mode_valid = 1;
+ }
+
+ channel->bus_format = of_get_bus_format(dev, child);
+ if (channel->bus_format == -EINVAL) {
+ /*
+ * If no bus format was specified in the device tree,
+ * we can still get it from the connected panel later.
+ */
+ if (channel->panel && channel->panel->funcs &&
+ channel->panel->funcs->get_modes)
+ channel->bus_format = 0;
+ }
+ if (channel->bus_format < 0) {
+ dev_err(dev, "could not determine data mapping: %d\n",
+ channel->bus_format);
+ return channel->bus_format;
+ }
+
+ ret = imx_ldb_register(drm, channel);
+ if (ret)
+ return ret;
+ }
+
+ dev_set_drvdata(dev, imx_ldb);
+
+ return 0;
+}
+
+static void imx_ldb_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ struct imx_ldb_channel *channel = &imx_ldb->channel[i];
+
+ if (!channel->connector.funcs)
+ continue;
+
+ channel->connector.funcs->destroy(&channel->connector);
+ channel->encoder.funcs->destroy(&channel->encoder);
+
+ kfree(channel->edid);
+ }
+}
+
+static const struct component_ops imx_ldb_ops = {
+ .bind = imx_ldb_bind,
+ .unbind = imx_ldb_unbind,
+};
+
+static int imx_ldb_probe(struct platform_device *pdev)
+{
+ return component_add(&pdev->dev, &imx_ldb_ops);
+}
+
+static int imx_ldb_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &imx_ldb_ops);
+ return 0;
+}
+
+static struct platform_driver imx_ldb_driver = {
+ .probe = imx_ldb_probe,
+ .remove = imx_ldb_remove,
+ .driver = {
+ .of_match_table = imx_ldb_dt_ids,
+ .name = DRIVER_NAME,
+ },
+};
+
+module_platform_driver(imx_ldb_driver);
+
+MODULE_DESCRIPTION("i.MX LVDS driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);