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From: Luca Ceresoli <luca.ceresoli@bootlin.com>
To: Neil Armstrong <neil.armstrong@linaro.org>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>
Cc: Luca Ceresoli <luca.ceresoli@bootlin.com>,
        dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Subject: [PATCH 3/3] DRM: panel: add Ilitek ILI9806E driver
Date: Wed, 19 Jul 2023 17:21:47 +0200
Message-Id: <20230719152147.355486-3-luca.ceresoli@bootlin.com>
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Add a driver for the ILITEK ILI9806E 480x864 RGB LCD controller connected
over SPI, and implement the ShenZhen New Display Co NDS040480800-V3 480x800
panel.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 MAINTAINERS                                   |   1 +
 drivers/gpu/drm/panel/Kconfig                 |  13 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-ilitek-ili9806e.c | 384 ++++++++++++++++++
 4 files changed, 399 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9806e.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 3c38699ee821..4d657a049acc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6520,6 +6520,7 @@ M:	Luca Ceresoli <luca.ceresoli@bootlin.com>
 S:	Maintained
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/panel/ilitek,ili9806e.yaml
+F:	drivers/gpu/drm/panel/panel-ilitek-ili9806e.c
 
 DRM DRIVER FOR JADARD JD9365DA-H3 MIPI-DSI LCD PANELS
 M:	Jagan Teki <jagan@edgeble.ai>
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 203c0ef0bbfd..e3e89d86668a 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -194,6 +194,19 @@ config DRM_PANEL_ILITEK_ILI9341
 	  QVGA (240x320) RGB panels. support serial & parallel rgb
 	  interface.
 
+config DRM_PANEL_ILITEK_ILI9806E
+	tristate "Ilitek ILI9806E panel"
+	depends on OF
+	depends on BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+	select DRM_MIPI_DBI
+	help
+	  Say Y here if you want to enable support for LCD panels connected
+	  over SPI and based on the Ilitek ILI9806E controller.
+
+	  The ILI9806E is an LCD controller capable of driving 18-bit a-Si
+	  TFT LCDs up to a resolution of 480x800.
+
 config DRM_PANEL_ILITEK_ILI9881C
 	tristate "Ilitek ILI9881C-based panels"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 30cf553c8d1d..f465140ae7df 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d
 obj-$(CONFIG_DRM_PANEL_HIMAX_HX8394) += panel-himax-hx8394.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) += panel-ilitek-ili9341.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9806E) += panel-ilitek-ili9806e.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_EJ030NA) += panel-innolux-ej030na.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c b/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c
new file mode 100644
index 000000000000..57c12bff70f8
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9806e.c
@@ -0,0 +1,384 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Ilitek ILI9806E a-Si TFT LCD controller.
+ *
+ * Copyright (c) 2023 Delcon SRL
+ * Luca Ceresoli <luca.ceresoli@bootlin.com>
+ */
+
+#include <drm/drm_mipi_dbi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/media-bus-format.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+#define ILI9806E_BUS_FORMAT	MEDIA_BUS_FMT_RGB666_1X18
+
+// Page 1 registers
+#define ILI9806E_P1_IFMODE1	0x08	// Interface Mode Control 1
+#define             IFMODE1_SEPT_SDIO	BIT(3) // 1 = two data pins
+#define             IFMODE1_SDO_STATUS	BIT(4) // 0 = SDO has output enable
+#define ILI9806E_P1_DISCTRL1	0x20	// Display Function Control 1
+#define ILI9806E_P1_DISCTRL2	0x21	// Display Function Control 2
+#define             DISCTRL2_EPL	BIT(0) // DE polarity (1 = active high)
+#define             DISCTRL2_DPL	BIT(1) // PCLK polarity (1 = fetch on falling edge)
+#define             DISCTRL2_HSPL	BIT(2) // HS polarity (1 = active high)
+#define             DISCTRL2_VSPL	BIT(3) // VS polarity (1 = active high)
+#define ILI9806E_P1_RESCTRL	0x30	// Resolution Control
+#define             RESCTRL_480x864	0x0
+#define             RESCTRL_480x854	0x1
+#define             RESCTRL_480x800	0x2
+#define             RESCTRL_480x640	0x3
+#define             RESCTRL_480x720	0x4
+#define ILI9806E_P1_INVTR	0x31	// Display Inversion Control
+#define             INVTR_NLA_COLUMN	0x0
+#define             INVTR_NLA_1DOT	0x1
+#define             INVTR_NLA_2DOT	0x2
+#define             INVTR_NLA_3DOT	0x3
+#define             INVTR_NLA_4DOT	0x4
+#define ILI9806E_P1_PWCTRL1	0x40	// Power Control 1
+#define ILI9806E_P1_PWCTRL2	0x41	// Power Control 2
+#define ILI9806E_P1_PWCTRL3	0x42	// Power Control 3
+#define ILI9806E_P1_PWCTRL4	0x43	// Power Control 4
+#define ILI9806E_P1_PWCTRL5	0x44	// Power Control 5
+#define ILI9806E_P1_PWCTRL6	0x45	// Power Control 6
+#define ILI9806E_P1_PWCTRL7	0x46	// Power Control 7
+#define ILI9806E_P1_PWCTRL8	0x47	// Power Control 8
+#define ILI9806E_P1_PWCTRL9	0x50	// Power Control 9
+#define ILI9806E_P1_PWCTRL10	0x51	// Power Control 10
+#define ILI9806E_P1_VMCTRL1	0x52	// VCOM Control 1
+#define ILI9806E_P1_VMCTRL2	0x53	// VCOM Control 1
+#define ILI9806E_P1_SRCTADJ1	0x60	// Source Timing Adjust 1
+#define ILI9806E_P1_SRCTADJ2	0x61	// Source Timing Adjust 2
+#define ILI9806E_P1_SRCTADJ3	0x62	// Source Timing Adjust 3
+#define ILI9806E_P1_SRCTADJ4	0x63	// Source Timing Adjust 4
+#define ILI9806E_P1_P_GAMMA(n)	(0xa0 + (n) - 1) // Positive Gamma Control 1~16
+#define ILI9806E_P1_N_GAMMA(n)	(0xc0 + (n) - 1) // Negative Gamma Correction 1~16
+
+// Page 7 registers
+#define ILI9806E_P7_VGLREGEN	0x17	// VGL_REG EN
+#define ILI9806E_P7_0x02	0x02	// undocumented
+#define ILI9806E_P7_0xe1	0xe1	// undocumented
+
+// The page-switching register (valid for all pages)
+#define ILI9806E_Px_ENEXTC	0xff
+
+static const struct drm_display_mode nds040480800_v3_mode = {
+	.width_mm    = 51,
+	.height_mm   = 85,
+	.clock       = 30000,
+	.hdisplay    = 480,
+	.hsync_start = 480 + 25,
+	.hsync_end   = 480 + 25 + 54,
+	.htotal      = 480 + 25 + 54 + 25,
+	.vdisplay    = 800,
+	.vsync_start = 800 + 25,
+	.vsync_end   = 800 + 25 + 14,
+	.vtotal      = 800 + 25 + 14 + 22,
+	.flags       = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+	.type        = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER,
+};
+
+struct ili9806e {
+	struct mipi_dbi dbi;
+	struct drm_panel panel;
+};
+
+static inline struct ili9806e *panel_to_ili9806e(struct drm_panel *panel)
+{
+	return container_of(panel, struct ili9806e, panel);
+}
+
+static int ili9806e_switch_page(struct ili9806e *ctx, unsigned int page)
+{
+	return mipi_dbi_command(&ctx->dbi, ILI9806E_Px_ENEXTC, 0xff, 0x98, 0x06, 0x04, page);
+}
+
+static int ili9806e_unprepare(struct drm_panel *panel)
+{
+	struct ili9806e *ctx = panel_to_ili9806e(panel);
+	struct mipi_dbi *dbi = &ctx->dbi;
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE, 0x00);
+
+	return 0;
+}
+
+static int ili9806e_prepare(struct drm_panel *panel)
+{
+	struct ili9806e *ctx = panel_to_ili9806e(panel);
+	struct mipi_dbi *dbi = &ctx->dbi;
+
+	/* Reset */
+
+	gpiod_set_value(ctx->dbi.reset, 1);
+	usleep_range(15, 50); // Min 10 us
+	gpiod_set_value(ctx->dbi.reset, 0);
+	msleep(125); // Min 5 ms in sleep in mode, 120 ms in sleep out mode
+
+	/* Init sequence */
+
+	ili9806e_switch_page(ctx, 1);
+
+	mipi_dbi_command(dbi, ILI9806E_P1_IFMODE1,  IFMODE1_SDO_STATUS);
+	mipi_dbi_command(dbi, ILI9806E_P1_DISCTRL2, DISCTRL2_EPL);
+	mipi_dbi_command(dbi, ILI9806E_P1_RESCTRL,  RESCTRL_480x800);
+	mipi_dbi_command(dbi, ILI9806E_P1_INVTR,    INVTR_NLA_COLUMN);
+
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL1,  0x10);
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL2,  0x55);
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL3,  0x02);
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL4,  0x09);
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL5,  0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL9,  0x78);
+	mipi_dbi_command(dbi, ILI9806E_P1_PWCTRL10, 0x78);
+
+	mipi_dbi_command(dbi, ILI9806E_P1_VMCTRL1,  0x00);
+	mipi_dbi_command(dbi, ILI9806E_P1_VMCTRL2,  0x6d);
+
+	mipi_dbi_command(dbi, ILI9806E_P1_SRCTADJ1, 0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_SRCTADJ2, 0x00);
+	mipi_dbi_command(dbi, ILI9806E_P1_SRCTADJ3, 0x08);
+	mipi_dbi_command(dbi, ILI9806E_P1_SRCTADJ4, 0x00);
+
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(1),  0x00);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(2),  0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(3),  0x0c);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(4),  0x0b);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(5),  0x03);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(6),  0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(7),  0x06);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(8),  0x04);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(9),  0x08);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(10), 0x0c);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(11), 0x13);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(12), 0x06);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(13), 0x0d);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(14), 0x19);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(15), 0x10);
+	mipi_dbi_command(dbi, ILI9806E_P1_P_GAMMA(16), 0x00);
+
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(1),  0x00);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(2),  0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(3),  0x0c);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(4),  0x0b);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(5),  0x03);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(6),  0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(7),  0x07);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(8),  0x04);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(9),  0x08);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(10), 0x0c);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(11), 0x13);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(12), 0x06);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(13), 0x0d);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(14), 0x18);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(15), 0x10);
+	mipi_dbi_command(dbi, ILI9806E_P1_N_GAMMA(16), 0x00);
+
+	ili9806e_switch_page(ctx, 6);
+
+	/* Registers in page 6 are not really documented except for the comments copied below */
+	mipi_dbi_command(dbi, 0x00, 0x20); // STV_A_Rise[10:8] | GIP_0_SET0
+	mipi_dbi_command(dbi, 0x01, 0x0a); // STV_A_Rise[7:0]
+	mipi_dbi_command(dbi, 0x02, 0x00); // GIP_0_SET1
+	mipi_dbi_command(dbi, 0x03, 0x00); // GIP_0_SET2
+	mipi_dbi_command(dbi, 0x04, 0x01); // GIP_0_SET3
+	mipi_dbi_command(dbi, 0x05, 0x01); // GIP_0_SET4
+	mipi_dbi_command(dbi, 0x06, 0x98); // CLK_A_Rise[10:8] | GIP_0_SET5
+	mipi_dbi_command(dbi, 0x07, 0x06); // CLK_A_Rise[7:0]
+	mipi_dbi_command(dbi, 0x08, 0x01); // GIP_0_SET6
+	mipi_dbi_command(dbi, 0x09, 0x80); // GIP_0_SET7
+	mipi_dbi_command(dbi, 0x0a, 0x00); // GIP_0_SET8
+	mipi_dbi_command(dbi, 0x0b, 0x00); // GIP_0_SET9
+	mipi_dbi_command(dbi, 0x0c, 0x01); // GIP_0_SET10
+	mipi_dbi_command(dbi, 0x0d, 0x01); // GIP_0_SET11
+	mipi_dbi_command(dbi, 0x0e, 0x00); // GIP_0_SET12
+	mipi_dbi_command(dbi, 0x0f, 0x00); // GIP_0_SET13
+	mipi_dbi_command(dbi, 0x10, 0xf0); // GIP_0_SET14
+	mipi_dbi_command(dbi, 0x11, 0xf4); // GIP_0_SET15
+	mipi_dbi_command(dbi, 0x12, 0x01); // GIP_0_SET16
+	mipi_dbi_command(dbi, 0x13, 0x00); // GIP_0_SET17
+	mipi_dbi_command(dbi, 0x14, 0x00); // GIP_0_SET18
+	mipi_dbi_command(dbi, 0x15, 0xc0); // GIP_0_SET19
+	mipi_dbi_command(dbi, 0x16, 0x08); // GIP_0_SET20
+	mipi_dbi_command(dbi, 0x17, 0x00); // GIP_0_SET21
+	mipi_dbi_command(dbi, 0x18, 0x00); // GIP_0_SET22
+	mipi_dbi_command(dbi, 0x19, 0x00); // GIP_0_SET23
+	mipi_dbi_command(dbi, 0x1a, 0x00); // GIP_0_SET24
+	mipi_dbi_command(dbi, 0x1b, 0x00); // GIP_0_SET25
+	mipi_dbi_command(dbi, 0x1c, 0x00); // GIP_0_SET26
+	mipi_dbi_command(dbi, 0x1d, 0x00); // GIP_0_SET27
+	mipi_dbi_command(dbi, 0x20, 0x01); // GIP_1_SET0
+	mipi_dbi_command(dbi, 0x21, 0x23); // GIP_1_SET1
+	mipi_dbi_command(dbi, 0x22, 0x45); // GIP_1_SET2
+	mipi_dbi_command(dbi, 0x23, 0x67); // GIP_1_SET3
+	mipi_dbi_command(dbi, 0x24, 0x01); // GIP_1_SET4
+	mipi_dbi_command(dbi, 0x25, 0x23); // GIP_1_SET5
+	mipi_dbi_command(dbi, 0x26, 0x45); // GIP_1_SET6
+	mipi_dbi_command(dbi, 0x27, 0x67); // GIP_1_SET7
+	mipi_dbi_command(dbi, 0x30, 0x11); // GIP_2_SET8
+	mipi_dbi_command(dbi, 0x31, 0x11); // GIP_2_SET9
+	mipi_dbi_command(dbi, 0x32, 0x00); // GIP_2_SET10
+	mipi_dbi_command(dbi, 0x33, 0xee); // GIP_2_SET11
+	mipi_dbi_command(dbi, 0x34, 0xff); // GIP_2_SET12
+	mipi_dbi_command(dbi, 0x35, 0xbb); // GIP_2_SET13
+	mipi_dbi_command(dbi, 0x36, 0xaa); // GIP_2_SET14
+	mipi_dbi_command(dbi, 0x37, 0xdd); // GIP_2_SET15
+	mipi_dbi_command(dbi, 0x38, 0xcc); // GIP_2_SET16
+	mipi_dbi_command(dbi, 0x39, 0x66); // GIP_2_SET17
+	mipi_dbi_command(dbi, 0x3a, 0x77); // GIP_2_SET18
+	mipi_dbi_command(dbi, 0x3b, 0x22); // GIP_2_SET19
+	mipi_dbi_command(dbi, 0x3c, 0x22); // GIP_2_SET20
+	mipi_dbi_command(dbi, 0x3d, 0x22); // GIP_2_SET21
+	mipi_dbi_command(dbi, 0x3e, 0x22); // GIP_2_SET22
+	mipi_dbi_command(dbi, 0x3f, 0x22); // GIP_2_SET23
+	mipi_dbi_command(dbi, 0x40, 0x22); // GIP_2_SET24
+	mipi_dbi_command(dbi, 0x52, 0x10); // undocumented
+	mipi_dbi_command(dbi, 0x53, 0x10); // GOUT_VGLO Control
+
+	ili9806e_switch_page(ctx, 7);
+
+	mipi_dbi_command(dbi, ILI9806E_P7_VGLREGEN, 0x22);
+	mipi_dbi_command(dbi, ILI9806E_P7_0x02,     0x77);
+	mipi_dbi_command(dbi, ILI9806E_P7_0xe1,     0x79);
+
+	ili9806e_switch_page(ctx, 0);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_TEAR_ON);
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+
+	msleep(120);
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+
+	return 0;
+}
+
+static int ili9806e_get_modes(struct drm_panel *panel,
+			      struct drm_connector *connector)
+{
+	const u32 bus_format = ILI9806E_BUS_FORMAT;
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &nds040480800_v3_mode);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_set_name(mode);
+
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	drm_display_info_set_bus_formats(&connector->display_info, &bus_format, 1);
+
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs ili9806e_drm_funcs = {
+	.unprepare = ili9806e_unprepare,
+	.prepare   = ili9806e_prepare,
+	.get_modes = ili9806e_get_modes,
+};
+
+static int ili9806e_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9806e *ctx;
+	int err;
+
+	ctx = devm_kzalloc(dev, sizeof(struct ili9806e), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	drm_panel_init(&ctx->panel, dev, &ili9806e_drm_funcs, DRM_MODE_CONNECTOR_DPI);
+
+	spi_set_drvdata(spi, ctx);
+
+	ctx->dbi.reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->dbi.reset))
+		return dev_err_probe(dev, PTR_ERR(ctx->dbi.reset), "cannot get reset-gpios\n");
+
+	err = drm_panel_of_backlight(&ctx->panel);
+	if (err)
+		return dev_err_probe(dev, err, "Failed to get backlight\n");
+
+	err = mipi_dbi_spi_init(spi, &ctx->dbi, NULL);
+	if (err)
+		return dev_err_probe(dev, err, "MIPI DBI init failed\n");
+
+	drm_panel_add(&ctx->panel);
+
+	return 0;
+}
+
+static void ili9806e_remove(struct spi_device *spi)
+{
+	struct ili9806e *ctx = spi_get_drvdata(spi);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ili9806e_suspend(struct device *dev)
+{
+	struct ili9806e *ctx = dev_get_drvdata(dev);
+	struct mipi_dbi *dbi = &ctx->dbi;
+
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF, 0x00);
+	mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE, 0x00);
+
+	return 0;
+}
+
+static int ili9806e_resume(struct device *dev)
+{
+	struct ili9806e *ctx = dev_get_drvdata(dev);
+	struct mipi_dbi *dbi = &ctx->dbi;
+
+	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE, 0x00);
+	msleep(120);
+	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON, 0x00);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops ili9806e_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(ili9806e_suspend, ili9806e_resume)
+};
+
+static const struct of_device_id ili9806e_of_match[] = {
+	{ .compatible = "newdisplay,nds040480800-v3" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili9806e_of_match);
+
+static const struct spi_device_id ili9806e_ids[] = {
+	{ "nds040480800-v3", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(spi, ili9806e_ids);
+
+static struct spi_driver ili9806e_driver = {
+	.probe = ili9806e_probe,
+	.remove = ili9806e_remove,
+	.id_table = ili9806e_ids,
+	.driver = {
+		.name = "panel-ilitek-ili9806e",
+		.of_match_table = ili9806e_of_match,
+		.pm = &ili9806e_pm_ops,
+	},
+};
+module_spi_driver(ili9806e_driver);
+
+MODULE_AUTHOR("Luca Ceresoli <luca.ceresoli@bootlin.com>");
+MODULE_DESCRIPTION("Ilitek ILI9806E LCD Driver");
+MODULE_LICENSE("GPL");