drm: sun4i: Add composite output

Some Allwinner SoCs have an IP called the TV encoder that is used to output
composite and VGA signals. In such a case, we need to use the second TCON
channel.

Add support for that TV encoder.

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

2 files changed, 623 insertions, 0 deletions

diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index 74f804b88ff5..58cd55149827 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -9,3 +9,5 @@ sun4i-tcon-y += sun4i_dotclock.o
 
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o
+
+obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c
new file mode 100644
index 000000000000..78634dfc0f77
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
@@ -0,0 +1,621 @@
+/*
+ * Copyright (C) 2015 Free Electrons
+ * Copyright (C) 2015 NextThing Co
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_panel.h>
+
+#include "sun4i_backend.h"
+#include "sun4i_drv.h"
+#include "sun4i_tcon.h"
+
+#define SUN4I_TVE_EN_REG		0x000
+#define SUN4I_TVE_EN_DAC_MAP_MASK		GENMASK(19, 4)
+#define SUN4I_TVE_EN_DAC_MAP(dac, out)		(((out) & 0xf) << (dac + 1) * 4)
+#define SUN4I_TVE_EN_ENABLE			BIT(0)
+
+#define SUN4I_TVE_CFG0_REG		0x004
+#define SUN4I_TVE_CFG0_DAC_CONTROL_54M		BIT(26)
+#define SUN4I_TVE_CFG0_CORE_DATAPATH_54M	BIT(25)
+#define SUN4I_TVE_CFG0_CORE_CONTROL_54M		BIT(24)
+#define SUN4I_TVE_CFG0_YC_EN			BIT(17)
+#define SUN4I_TVE_CFG0_COMP_EN			BIT(16)
+#define SUN4I_TVE_CFG0_RES(x)			((x) & 0xf)
+#define SUN4I_TVE_CFG0_RES_480i			SUN4I_TVE_CFG0_RES(0)
+#define SUN4I_TVE_CFG0_RES_576i			SUN4I_TVE_CFG0_RES(1)
+
+#define SUN4I_TVE_DAC0_REG		0x008
+#define SUN4I_TVE_DAC0_CLOCK_INVERT		BIT(24)
+#define SUN4I_TVE_DAC0_LUMA(x)			(((x) & 3) << 20)
+#define SUN4I_TVE_DAC0_LUMA_0_4			SUN4I_TVE_DAC0_LUMA(3)
+#define SUN4I_TVE_DAC0_CHROMA(x)		(((x) & 3) << 18)
+#define SUN4I_TVE_DAC0_CHROMA_0_75		SUN4I_TVE_DAC0_CHROMA(3)
+#define SUN4I_TVE_DAC0_INTERNAL_DAC(x)		(((x) & 3) << 16)
+#define SUN4I_TVE_DAC0_INTERNAL_DAC_37_5_OHMS	SUN4I_TVE_DAC0_INTERNAL_DAC(3)
+#define SUN4I_TVE_DAC0_DAC_EN(dac)		BIT(dac)
+
+#define SUN4I_TVE_NOTCH_REG		0x00c
+#define SUN4I_TVE_NOTCH_DAC0_TO_DAC_DLY(dac, x)	((4 - (x)) << (dac * 3))
+
+#define SUN4I_TVE_CHROMA_FREQ_REG	0x010
+
+#define SUN4I_TVE_PORCH_REG		0x014
+#define SUN4I_TVE_PORCH_BACK(x)			((x) << 16)
+#define SUN4I_TVE_PORCH_FRONT(x)		(x)
+
+#define SUN4I_TVE_LINE_REG		0x01c
+#define SUN4I_TVE_LINE_FIRST(x)			((x) << 16)
+#define SUN4I_TVE_LINE_NUMBER(x)		(x)
+
+#define SUN4I_TVE_LEVEL_REG		0x020
+#define SUN4I_TVE_LEVEL_BLANK(x)		((x) << 16)
+#define SUN4I_TVE_LEVEL_BLACK(x)		(x)
+
+#define SUN4I_TVE_DAC1_REG		0x024
+#define SUN4I_TVE_DAC1_AMPLITUDE(dac, x)	((x) << (dac * 8))
+
+#define SUN4I_TVE_DETECT_STA_REG	0x038
+#define SUN4I_TVE_DETECT_STA_DAC(dac)		BIT((dac * 8))
+#define SUN4I_TVE_DETECT_STA_UNCONNECTED		0
+#define SUN4I_TVE_DETECT_STA_CONNECTED			1
+#define SUN4I_TVE_DETECT_STA_GROUND			2
+
+#define SUN4I_TVE_CB_CR_LVL_REG		0x10c
+#define SUN4I_TVE_CB_CR_LVL_CR_BURST(x)		((x) << 8)
+#define SUN4I_TVE_CB_CR_LVL_CB_BURST(x)		(x)
+
+#define SUN4I_TVE_TINT_BURST_PHASE_REG	0x110
+#define SUN4I_TVE_TINT_BURST_PHASE_CHROMA(x)	(x)
+
+#define SUN4I_TVE_BURST_WIDTH_REG	0x114
+#define SUN4I_TVE_BURST_WIDTH_BREEZEWAY(x)	((x) << 16)
+#define SUN4I_TVE_BURST_WIDTH_BURST_WIDTH(x)	((x) << 8)
+#define SUN4I_TVE_BURST_WIDTH_HSYNC_WIDTH(x)	(x)
+
+#define SUN4I_TVE_CB_CR_GAIN_REG	0x118
+#define SUN4I_TVE_CB_CR_GAIN_CR(x)		((x) << 8)
+#define SUN4I_TVE_CB_CR_GAIN_CB(x)		(x)
+
+#define SUN4I_TVE_SYNC_VBI_REG		0x11c
+#define SUN4I_TVE_SYNC_VBI_SYNC(x)		((x) << 16)
+#define SUN4I_TVE_SYNC_VBI_VBLANK(x)		(x)
+
+#define SUN4I_TVE_ACTIVE_LINE_REG	0x124
+#define SUN4I_TVE_ACTIVE_LINE(x)		(x)
+
+#define SUN4I_TVE_CHROMA_REG		0x128
+#define SUN4I_TVE_CHROMA_COMP_GAIN(x)		((x) & 3)
+#define SUN4I_TVE_CHROMA_COMP_GAIN_50		SUN4I_TVE_CHROMA_COMP_GAIN(2)
+
+#define SUN4I_TVE_12C_REG		0x12c
+#define SUN4I_TVE_12C_NOTCH_WIDTH_WIDE		BIT(8)
+#define SUN4I_TVE_12C_COMP_YUV_EN		BIT(0)
+
+#define SUN4I_TVE_RESYNC_REG		0x130
+#define SUN4I_TVE_RESYNC_FIELD			BIT(31)
+#define SUN4I_TVE_RESYNC_LINE(x)		((x) << 16)
+#define SUN4I_TVE_RESYNC_PIXEL(x)		(x)
+
+#define SUN4I_TVE_SLAVE_REG		0x134
+
+#define SUN4I_TVE_WSS_DATA2_REG		0x244
+
+struct color_gains {
+	u16	cb;
+	u16	cr;
+};
+
+struct burst_levels {
+	u16	cb;
+	u16	cr;
+};
+
+struct video_levels {
+	u16	black;
+	u16	blank;
+};
+
+struct resync_parameters {
+	bool	field;
+	u16	line;
+	u16	pixel;
+};
+
+struct tv_mode {
+	char		*name;
+
+	u32		mode;
+	u32		chroma_freq;
+	u16		back_porch;
+	u16		front_porch;
+	u16		line_number;
+	u16		vblank_level;
+
+	u32		hdisplay;
+	u16		hfront_porch;
+	u16		hsync_len;
+	u16		hback_porch;
+
+	u32		vdisplay;
+	u16		vfront_porch;
+	u16		vsync_len;
+	u16		vback_porch;
+
+	bool		yc_en;
+	bool		dac3_en;
+	bool		dac_bit25_en;
+
+	struct color_gains		*color_gains;
+	struct burst_levels		*burst_levels;
+	struct video_levels		*video_levels;
+	struct resync_parameters	*resync_params;
+};
+
+struct sun4i_tv {
+	struct drm_connector	connector;
+	struct drm_encoder	encoder;
+
+	struct clk		*clk;
+	struct regmap		*regs;
+	struct reset_control	*reset;
+
+	struct sun4i_drv	*drv;
+};
+
+struct tv_mode tv_modes[] = {
+};
+
+static inline struct sun4i_tv *
+drm_encoder_to_sun4i_tv(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct sun4i_tv,
+			    encoder);
+}
+
+static inline struct sun4i_tv *
+drm_connector_to_sun4i_tv(struct drm_connector *connector)
+{
+	return container_of(connector, struct sun4i_tv,
+			    connector);
+}
+
+/*
+ * FIXME: If only the drm_display_mode private field was usable, this
+ * could go away...
+ *
+ * So far, it doesn't seem to be preserved when the mode is passed by
+ * to mode_set for some reason.
+ */
+static struct tv_mode *sun4i_tv_find_tv_by_mode(struct drm_display_mode *mode)
+{
+	int i;
+
+	/* First try to identify the mode by name */
+	for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
+		struct tv_mode *tv_mode = &tv_modes[i];
+
+		DRM_DEBUG_DRIVER("Comparing mode %s vs %s",
+				 mode->name, tv_mode->name);
+
+		if (!strcmp(mode->name, tv_mode->name))
+			return tv_mode;
+	}
+
+	/* Then by number of lines */
+	for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
+		struct tv_mode *tv_mode = &tv_modes[i];
+
+		DRM_DEBUG_DRIVER("Comparing mode %s vs %s (X: %d vs %d)",
+				 mode->name, tv_mode->name,
+				 mode->vdisplay, tv_mode->vdisplay);
+
+		if (mode->vdisplay == tv_mode->vdisplay)
+			return tv_mode;
+	}
+
+	return NULL;
+}
+
+static void sun4i_tv_mode_to_drm_mode(struct tv_mode *tv_mode,
+				      struct drm_display_mode *mode)
+{
+	DRM_DEBUG_DRIVER("Creating mode %s\n", mode->name);
+
+	mode->type = DRM_MODE_TYPE_DRIVER;
+	mode->clock = 13500;
+	mode->flags = DRM_MODE_FLAG_INTERLACE;
+
+	mode->hdisplay = tv_mode->hdisplay;
+	mode->hsync_start = mode->hdisplay + tv_mode->hfront_porch;
+	mode->hsync_end = mode->hsync_start + tv_mode->hsync_len;
+	mode->htotal = mode->hsync_end  + tv_mode->hback_porch;
+
+	mode->vdisplay = tv_mode->vdisplay;
+	mode->vsync_start = mode->vdisplay + tv_mode->vfront_porch;
+	mode->vsync_end = mode->vsync_start + tv_mode->vsync_len;
+	mode->vtotal = mode->vsync_end  + tv_mode->vback_porch;
+}
+
+static int sun4i_tv_atomic_check(struct drm_encoder *encoder,
+				 struct drm_crtc_state *crtc_state,
+				 struct drm_connector_state *conn_state)
+{
+	return 0;
+}
+
+static void sun4i_tv_disable(struct drm_encoder *encoder)
+{
+	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
+	struct sun4i_drv *drv = tv->drv;
+	struct sun4i_tcon *tcon = drv->tcon;
+
+	DRM_DEBUG_DRIVER("Disabling the TV Output\n");
+
+	sun4i_tcon_channel_disable(tcon, 1);
+
+	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
+			   SUN4I_TVE_EN_ENABLE,
+			   0);
+	sun4i_backend_disable_color_correction(drv->backend);
+}
+
+static void sun4i_tv_enable(struct drm_encoder *encoder)
+{
+	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
+	struct sun4i_drv *drv = tv->drv;
+	struct sun4i_tcon *tcon = drv->tcon;
+
+	DRM_DEBUG_DRIVER("Enabling the TV Output\n");
+
+	sun4i_backend_apply_color_correction(drv->backend);
+
+	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
+			   SUN4I_TVE_EN_ENABLE,
+			   SUN4I_TVE_EN_ENABLE);
+
+	sun4i_tcon_channel_enable(tcon, 1);
+}
+
+static void sun4i_tv_mode_set(struct drm_encoder *encoder,
+			      struct drm_display_mode *mode,
+			      struct drm_display_mode *adjusted_mode)
+{
+	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
+	struct sun4i_drv *drv = tv->drv;
+	struct sun4i_tcon *tcon = drv->tcon;
+	struct tv_mode *tv_mode = sun4i_tv_find_tv_by_mode(mode);
+
+	sun4i_tcon1_mode_set(tcon, mode);
+
+	/* Enable and map the DAC to the output */
+	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
+			   SUN4I_TVE_EN_DAC_MAP_MASK,
+			   SUN4I_TVE_EN_DAC_MAP(0, 1) |
+			   SUN4I_TVE_EN_DAC_MAP(1, 2) |
+			   SUN4I_TVE_EN_DAC_MAP(2, 3) |
+			   SUN4I_TVE_EN_DAC_MAP(3, 4));
+
+	/* Set PAL settings */
+	regmap_write(tv->regs, SUN4I_TVE_CFG0_REG,
+		     tv_mode->mode |
+		     (tv_mode->yc_en ? SUN4I_TVE_CFG0_YC_EN : 0) |
+		     SUN4I_TVE_CFG0_COMP_EN |
+		     SUN4I_TVE_CFG0_DAC_CONTROL_54M |
+		     SUN4I_TVE_CFG0_CORE_DATAPATH_54M |
+		     SUN4I_TVE_CFG0_CORE_CONTROL_54M);
+
+	/* Configure the DAC for a composite output */
+	regmap_write(tv->regs, SUN4I_TVE_DAC0_REG,
+		     SUN4I_TVE_DAC0_DAC_EN(0) |
+		     (tv_mode->dac3_en ? SUN4I_TVE_DAC0_DAC_EN(3) : 0) |
+		     SUN4I_TVE_DAC0_INTERNAL_DAC_37_5_OHMS |
+		     SUN4I_TVE_DAC0_CHROMA_0_75 |
+		     SUN4I_TVE_DAC0_LUMA_0_4 |
+		     SUN4I_TVE_DAC0_CLOCK_INVERT |
+		     (tv_mode->dac_bit25_en ? BIT(25) : 0) |
+		     BIT(30));
+
+	/* Configure the sample delay between DAC0 and the other DAC */
+	regmap_write(tv->regs, SUN4I_TVE_NOTCH_REG,
+		     SUN4I_TVE_NOTCH_DAC0_TO_DAC_DLY(1, 0) |
+		     SUN4I_TVE_NOTCH_DAC0_TO_DAC_DLY(2, 0));
+
+	regmap_write(tv->regs, SUN4I_TVE_CHROMA_FREQ_REG,
+		     tv_mode->chroma_freq);
+
+	/* Set the front and back porch */
+	regmap_write(tv->regs, SUN4I_TVE_PORCH_REG,
+		     SUN4I_TVE_PORCH_BACK(tv_mode->back_porch) |
+		     SUN4I_TVE_PORCH_FRONT(tv_mode->front_porch));
+
+	/* Set the lines setup */
+	regmap_write(tv->regs, SUN4I_TVE_LINE_REG,
+		     SUN4I_TVE_LINE_FIRST(22) |
+		     SUN4I_TVE_LINE_NUMBER(tv_mode->line_number));
+
+	regmap_write(tv->regs, SUN4I_TVE_LEVEL_REG,
+		     SUN4I_TVE_LEVEL_BLANK(tv_mode->video_levels->blank) |
+		     SUN4I_TVE_LEVEL_BLACK(tv_mode->video_levels->black));
+
+	regmap_write(tv->regs, SUN4I_TVE_DAC1_REG,
+		     SUN4I_TVE_DAC1_AMPLITUDE(0, 0x18) |
+		     SUN4I_TVE_DAC1_AMPLITUDE(1, 0x18) |
+		     SUN4I_TVE_DAC1_AMPLITUDE(2, 0x18) |
+		     SUN4I_TVE_DAC1_AMPLITUDE(3, 0x18));
+
+	regmap_write(tv->regs, SUN4I_TVE_CB_CR_LVL_REG,
+		     SUN4I_TVE_CB_CR_LVL_CB_BURST(tv_mode->burst_levels->cb) |
+		     SUN4I_TVE_CB_CR_LVL_CR_BURST(tv_mode->burst_levels->cr));
+
+	/* Set burst width for a composite output */
+	regmap_write(tv->regs, SUN4I_TVE_BURST_WIDTH_REG,
+		     SUN4I_TVE_BURST_WIDTH_HSYNC_WIDTH(126) |
+		     SUN4I_TVE_BURST_WIDTH_BURST_WIDTH(68) |
+		     SUN4I_TVE_BURST_WIDTH_BREEZEWAY(22));
+
+	regmap_write(tv->regs, SUN4I_TVE_CB_CR_GAIN_REG,
+		     SUN4I_TVE_CB_CR_GAIN_CB(tv_mode->color_gains->cb) |
+		     SUN4I_TVE_CB_CR_GAIN_CR(tv_mode->color_gains->cr));
+
+	regmap_write(tv->regs, SUN4I_TVE_SYNC_VBI_REG,
+		     SUN4I_TVE_SYNC_VBI_SYNC(0x10) |
+		     SUN4I_TVE_SYNC_VBI_VBLANK(tv_mode->vblank_level));
+
+	regmap_write(tv->regs, SUN4I_TVE_ACTIVE_LINE_REG,
+		     SUN4I_TVE_ACTIVE_LINE(1440));
+
+	/* Set composite chroma gain to 50 % */
+	regmap_write(tv->regs, SUN4I_TVE_CHROMA_REG,
+		     SUN4I_TVE_CHROMA_COMP_GAIN_50);
+
+	regmap_write(tv->regs, SUN4I_TVE_12C_REG,
+		     SUN4I_TVE_12C_COMP_YUV_EN |
+		     SUN4I_TVE_12C_NOTCH_WIDTH_WIDE);
+
+	regmap_write(tv->regs, SUN4I_TVE_RESYNC_REG,
+		     SUN4I_TVE_RESYNC_PIXEL(tv_mode->resync_params->pixel) |
+		     SUN4I_TVE_RESYNC_LINE(tv_mode->resync_params->line) |
+		     (tv_mode->resync_params->field ?
+		      SUN4I_TVE_RESYNC_FIELD : 0));
+
+	regmap_write(tv->regs, SUN4I_TVE_SLAVE_REG, 0);
+
+	clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
+}
+
+static struct drm_encoder_helper_funcs sun4i_tv_helper_funcs = {
+	.atomic_check	= sun4i_tv_atomic_check,
+	.disable	= sun4i_tv_disable,
+	.enable		= sun4i_tv_enable,
+	.mode_set	= sun4i_tv_mode_set,
+};
+
+static void sun4i_tv_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+}
+
+static struct drm_encoder_funcs sun4i_tv_funcs = {
+	.destroy	= sun4i_tv_destroy,
+};
+
+static int sun4i_tv_comp_get_modes(struct drm_connector *connector)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
+		struct drm_display_mode *mode = drm_mode_create(connector->dev);
+		struct tv_mode *tv_mode = &tv_modes[i];
+
+		strcpy(mode->name, tv_mode->name);
+
+		sun4i_tv_mode_to_drm_mode(tv_mode, mode);
+		drm_mode_probed_add(connector, mode);
+	}
+
+	return i;
+}
+
+static int sun4i_tv_comp_mode_valid(struct drm_connector *connector,
+				    struct drm_display_mode *mode)
+{
+	/* TODO */
+	return MODE_OK;
+}
+
+static struct drm_encoder *
+sun4i_tv_comp_best_encoder(struct drm_connector *connector)
+{
+	struct sun4i_tv *tv = drm_connector_to_sun4i_tv(connector);
+
+	return &tv->encoder;
+}
+
+static struct drm_connector_helper_funcs sun4i_tv_comp_connector_helper_funcs = {
+	.get_modes	= sun4i_tv_comp_get_modes,
+	.mode_valid	= sun4i_tv_comp_mode_valid,
+	.best_encoder	= sun4i_tv_comp_best_encoder,
+};
+
+static enum drm_connector_status
+sun4i_tv_comp_connector_detect(struct drm_connector *connector, bool force)
+{
+	return connector_status_connected;
+}
+
+static void
+sun4i_tv_comp_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_cleanup(connector);
+}
+
+static struct drm_connector_funcs sun4i_tv_comp_connector_funcs = {
+	.dpms			= drm_atomic_helper_connector_dpms,
+	.detect			= sun4i_tv_comp_connector_detect,
+	.fill_modes		= drm_helper_probe_single_connector_modes,
+	.destroy		= sun4i_tv_comp_connector_destroy,
+	.reset			= drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
+};
+
+static struct regmap_config sun4i_tv_regmap_config = {
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= SUN4I_TVE_WSS_DATA2_REG,
+	.name		= "tv-encoder",
+};
+
+static int sun4i_tv_bind(struct device *dev, struct device *master,
+			 void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = data;
+	struct sun4i_drv *drv = drm->dev_private;
+	struct sun4i_tv *tv;
+	struct resource *res;
+	void __iomem *regs;
+	int ret;
+
+	tv = devm_kzalloc(dev, sizeof(*tv), GFP_KERNEL);
+	if (!tv)
+		return -ENOMEM;
+	tv->drv = drv;
+	dev_set_drvdata(dev, tv);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(regs)) {
+		dev_err(dev, "Couldn't map the TV encoder registers\n");
+		return PTR_ERR(regs);
+	}
+
+	tv->regs = devm_regmap_init_mmio(dev, regs,
+					 &sun4i_tv_regmap_config);
+	if (IS_ERR(tv->regs)) {
+		dev_err(dev, "Couldn't create the TV encoder regmap\n");
+		return PTR_ERR(tv->regs);
+	}
+
+	tv->reset = devm_reset_control_get(dev, NULL);
+	if (IS_ERR(tv->reset)) {
+		dev_err(dev, "Couldn't get our reset line\n");
+		return PTR_ERR(tv->reset);
+	}
+
+	ret = reset_control_deassert(tv->reset);
+	if (ret) {
+		dev_err(dev, "Couldn't deassert our reset line\n");
+		return ret;
+	}
+
+	tv->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(tv->clk)) {
+		dev_err(dev, "Couldn't get the TV encoder clock\n");
+		ret = PTR_ERR(tv->clk);
+		goto err_assert_reset;
+	}
+	clk_prepare_enable(tv->clk);
+
+	drm_encoder_helper_add(&tv->encoder,
+			       &sun4i_tv_helper_funcs);
+	ret = drm_encoder_init(drm,
+			       &tv->encoder,
+			       &sun4i_tv_funcs,
+			       DRM_MODE_ENCODER_TVDAC,
+			       NULL);
+	if (ret) {
+		dev_err(dev, "Couldn't initialise the TV encoder\n");
+		goto err_disable_clk;
+	}
+
+	tv->encoder.possible_crtcs = BIT(0);
+
+	drm_connector_helper_add(&tv->connector,
+				 &sun4i_tv_comp_connector_helper_funcs);
+	ret = drm_connector_init(drm, &tv->connector,
+				 &sun4i_tv_comp_connector_funcs,
+				 DRM_MODE_CONNECTOR_Composite);
+	if (ret) {
+		dev_err(dev,
+			"Couldn't initialise the Composite connector\n");
+		goto err_cleanup_connector;
+	}
+	tv->connector.interlace_allowed = true;
+
+	drm_mode_connector_attach_encoder(&tv->connector, &tv->encoder);
+
+	return 0;
+
+err_cleanup_connector:
+	drm_encoder_cleanup(&tv->encoder);
+err_disable_clk:
+	clk_disable_unprepare(tv->clk);
+err_assert_reset:
+	reset_control_assert(tv->reset);
+	return ret;
+}
+
+static void sun4i_tv_unbind(struct device *dev, struct device *master,
+			    void *data)
+{
+	struct sun4i_tv *tv = dev_get_drvdata(dev);
+
+	drm_connector_cleanup(&tv->connector);
+	drm_encoder_cleanup(&tv->encoder);
+	clk_disable_unprepare(tv->clk);
+}
+
+static struct component_ops sun4i_tv_ops = {
+	.bind	= sun4i_tv_bind,
+	.unbind	= sun4i_tv_unbind,
+};
+
+static int sun4i_tv_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &sun4i_tv_ops);
+}
+
+static int sun4i_tv_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &sun4i_tv_ops);
+
+	return 0;
+}
+
+static const struct of_device_id sun4i_tv_of_table[] = {
+	{ .compatible = "allwinner,sun4i-a10-tv-encoder" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sun4i_tv_of_table);
+
+static struct platform_driver sun4i_tv_platform_driver = {
+	.probe		= sun4i_tv_probe,
+	.remove		= sun4i_tv_remove,
+	.driver		= {
+		.name		= "sun4i-tve",
+		.of_match_table	= sun4i_tv_of_table,
+	},
+};
+module_platform_driver(sun4i_tv_platform_driver);
+
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_DESCRIPTION("Allwinner A10 TV Encoder Driver");
+MODULE_LICENSE("GPL");