[PATCH v2 2/6] video: bridge: add Solomon SSD2825 DSI/LVDS driver

Svyatoslav Ryhel clamor95 at gmail.com
Thu Apr 20 18:17:20 CEST 2023


SSD2825 is an innovative and cost-effective MIPI Bridge Chip solution
targeting high resolution smartphones. It can convert 24bit RGB
interface into 4-lane MIPI-DSI interface to drive extremely high
resolution display modules of up to 800 x 1366, while supporting AMOLED,
a-si LCD or LTPS advanced panel technologies for smartphone applications.

Bridge is wrapped in panel uClass model for wider compatibility.

Tested-by: Andreas Westman Dorcsak <hedmoo at yahoo.com> # LG P880 T30
Tested-by: Svyatoslav Ryhel <clamor95 at gmail.com> # LG P895 T30
Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 drivers/video/bridge/Kconfig   |   7 +
 drivers/video/bridge/Makefile  |   1 +
 drivers/video/bridge/ssd2825.c | 520 +++++++++++++++++++++++++++++++++
 3 files changed, 528 insertions(+)
 create mode 100644 drivers/video/bridge/ssd2825.c

diff --git a/drivers/video/bridge/Kconfig b/drivers/video/bridge/Kconfig
index 765f7380b8..2311ca2d1a 100644
--- a/drivers/video/bridge/Kconfig
+++ b/drivers/video/bridge/Kconfig
@@ -33,3 +33,10 @@ config VIDEO_BRIDGE_ANALOGIX_ANX6345
 	help
 	 The Analogix ANX6345 is RGB-to-DP converter. It enables an eDP LCD
 	 panel to be connected to an parallel LCD interface.
+
+config VIDEO_BRIDGE_SOLOMON_SSD2825
+	bool "Solomon SSD2825 bridge driver"
+	depends on PANEL && DM_GPIO
+	select VIDEO_MIPI_DSI
+	help
+	  Solomon SSD2824 SPI RGB-DSI bridge driver wrapped into panel uClass.
diff --git a/drivers/video/bridge/Makefile b/drivers/video/bridge/Makefile
index 45e54ac176..22625c8bc6 100644
--- a/drivers/video/bridge/Makefile
+++ b/drivers/video/bridge/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_VIDEO_BRIDGE) += video-bridge-uclass.o
 obj-$(CONFIG_VIDEO_BRIDGE_PARADE_PS862X) += ps862x.o
 obj-$(CONFIG_VIDEO_BRIDGE_NXP_PTN3460) += ptn3460.o
 obj-$(CONFIG_VIDEO_BRIDGE_ANALOGIX_ANX6345) += anx6345.o
+obj-$(CONFIG_VIDEO_BRIDGE_SOLOMON_SSD2825) += ssd2825.o
diff --git a/drivers/video/bridge/ssd2825.c b/drivers/video/bridge/ssd2825.c
new file mode 100644
index 0000000000..d1c6baa053
--- /dev/null
+++ b/drivers/video/bridge/ssd2825.c
@@ -0,0 +1,520 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2022 Svyatoslav Ryhel <clamor95 at gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <log.h>
+#include <misc.h>
+#include <mipi_display.h>
+#include <mipi_dsi.h>
+#include <backlight.h>
+#include <panel.h>
+#include <spi.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <asm/gpio.h>
+
+#define SSD2825_DEVICE_ID_REG			0xB0
+#define SSD2825_RGB_INTERFACE_CTRL_REG_1	0xB1
+#define SSD2825_RGB_INTERFACE_CTRL_REG_2	0xB2
+#define SSD2825_RGB_INTERFACE_CTRL_REG_3	0xB3
+#define SSD2825_RGB_INTERFACE_CTRL_REG_4	0xB4
+#define SSD2825_RGB_INTERFACE_CTRL_REG_5	0xB5
+#define SSD2825_RGB_INTERFACE_CTRL_REG_6	0xB6
+#define   SSD2825_NON_BURST			BIT(2)
+#define   SSD2825_BURST				BIT(3)
+#define   SSD2825_PCKL_HIGH			BIT(13)
+#define   SSD2825_HSYNC_HIGH			BIT(14)
+#define   SSD2825_VSYNC_HIGH			BIT(15)
+#define SSD2825_CONFIGURATION_REG		0xB7
+#define   SSD2825_CONF_REG_HS			BIT(0)
+#define   SSD2825_CONF_REG_CKE			BIT(1)
+#define   SSD2825_CONF_REG_SLP			BIT(2)
+#define   SSD2825_CONF_REG_VEN			BIT(3)
+#define   SSD2825_CONF_REG_HCLK			BIT(4)
+#define   SSD2825_CONF_REG_CSS			BIT(5)
+#define   SSD2825_CONF_REG_DCS			BIT(6)
+#define   SSD2825_CONF_REG_REN			BIT(7)
+#define   SSD2825_CONF_REG_ECD			BIT(8)
+#define   SSD2825_CONF_REG_EOT			BIT(9)
+#define   SSD2825_CONF_REG_LPE			BIT(10)
+#define SSD2825_VC_CTRL_REG			0xB8
+#define SSD2825_PLL_CTRL_REG			0xB9
+#define SSD2825_PLL_CONFIGURATION_REG		0xBA
+#define SSD2825_CLOCK_CTRL_REG			0xBB
+#define SSD2825_PACKET_SIZE_CTRL_REG_1		0xBC
+#define SSD2825_PACKET_SIZE_CTRL_REG_2		0xBD
+#define SSD2825_PACKET_SIZE_CTRL_REG_3		0xBE
+#define SSD2825_PACKET_DROP_REG			0xBF
+#define SSD2825_OPERATION_CTRL_REG		0xC0
+#define SSD2825_MAX_RETURN_SIZE_REG		0xC1
+#define SSD2825_RETURN_DATA_COUNT_REG		0xC2
+#define SSD2825_ACK_RESPONSE_REG		0xC3
+#define SSD2825_LINE_CTRL_REG			0xC4
+#define SSD2825_INTERRUPT_CTRL_REG		0xC5
+#define SSD2825_INTERRUPT_STATUS_REG		0xC6
+#define SSD2825_ERROR_STATUS_REG		0xC7
+#define SSD2825_DATA_FORMAT_REG			0xC8
+#define SSD2825_DELAY_ADJ_REG_1			0xC9
+#define SSD2825_DELAY_ADJ_REG_2			0xCA
+#define SSD2825_DELAY_ADJ_REG_3			0xCB
+#define SSD2825_DELAY_ADJ_REG_4			0xCC
+#define SSD2825_DELAY_ADJ_REG_5			0xCD
+#define SSD2825_DELAY_ADJ_REG_6			0xCE
+#define SSD2825_HS_TX_TIMER_REG_1		0xCF
+#define SSD2825_HS_TX_TIMER_REG_2		0xD0
+#define SSD2825_LP_RX_TIMER_REG_1		0xD1
+#define SSD2825_LP_RX_TIMER_REG_2		0xD2
+#define SSD2825_TE_STATUS_REG			0xD3
+#define SSD2825_SPI_READ_REG			0xD4
+#define SSD2825_PLL_LOCK_REG			0xD5
+#define SSD2825_TEST_REG			0xD6
+#define SSD2825_TE_COUNT_REG			0xD7
+#define SSD2825_ANALOG_CTRL_REG_1		0xD8
+#define SSD2825_ANALOG_CTRL_REG_2		0xD9
+#define SSD2825_ANALOG_CTRL_REG_3		0xDA
+#define SSD2825_ANALOG_CTRL_REG_4		0xDB
+#define SSD2825_INTERRUPT_OUT_CTRL_REG		0xDC
+#define SSD2825_RGB_INTERFACE_CTRL_REG_7	0xDD
+#define SSD2825_LANE_CONFIGURATION_REG		0xDE
+#define SSD2825_DELAY_ADJ_REG_7			0xDF
+#define SSD2825_INPUT_PIN_CTRL_REG_1		0xE0
+#define SSD2825_INPUT_PIN_CTRL_REG_2		0xE1
+#define SSD2825_BIDIR_PIN_CTRL_REG_1		0xE2
+#define SSD2825_BIDIR_PIN_CTRL_REG_2		0xE3
+#define SSD2825_BIDIR_PIN_CTRL_REG_3		0xE4
+#define SSD2825_BIDIR_PIN_CTRL_REG_4		0xE5
+#define SSD2825_BIDIR_PIN_CTRL_REG_5		0xE6
+#define SSD2825_BIDIR_PIN_CTRL_REG_6		0xE7
+#define SSD2825_BIDIR_PIN_CTRL_REG_7		0xE8
+#define SSD2825_CABC_BRIGHTNESS_CTRL_REG_1	0xE9
+#define SSD2825_CABC_BRIGHTNESS_CTRL_REG_2	0xEA
+#define SSD2825_CABC_BRIGHTNESS_STATUS_REG	0xEB
+#define SSD2825_READ_REG			0xFF
+#define   SSD2825_SPI_READ_REG_RESET		0xFA
+
+#define SSD2825_CMD_MASK		0x00
+#define SSD2825_DAT_MASK		0x01
+
+#define SSD2825_CMD_SEND		BIT(0)
+#define SSD2825_DAT_SEND		BIT(1)
+#define SSD2825_DSI_SEND		BIT(2)
+
+#define	SSD2828_LP_CLOCK_DIVIDER(n)	(((n) - 1) & 0x3F)
+#define SSD2825_LP_MIN_CLK		5000 /* KHz */
+#define SSD2825_REF_MIN_CLK		2000 /* KHz */
+
+struct ssd2825_bridge_priv {
+	struct mipi_dsi_host host;
+	struct mipi_dsi_device device;
+
+	struct udevice *panel;
+	struct display_timing timing;
+
+	struct gpio_desc power_gpio;
+	struct gpio_desc reset_gpio;
+
+	struct clk *tx_clk;
+
+	u32 pll_freq_kbps;	/* PLL in kbps */
+};
+
+static int ssd2825_spi_write(struct udevice *dev, int reg,
+			     const void *buf, int flags)
+{
+	u8 command[2];
+
+	if (flags & SSD2825_CMD_SEND) {
+		command[0] = SSD2825_CMD_MASK;
+		command[1] = reg;
+		dm_spi_xfer(dev, 9, &command,
+			    NULL, SPI_XFER_ONCE);
+	}
+
+	if (flags & SSD2825_DAT_SEND) {
+		u16 data = *(u16 *)buf;
+		u8 cmd1, cmd2;
+
+		/* send low byte first and then high byte */
+		cmd1 = (data & 0x00FF);
+		cmd2 = (data & 0xFF00) >> 8;
+
+		command[0] = SSD2825_DAT_MASK;
+		command[1] = cmd1;
+		dm_spi_xfer(dev, 9, &command,
+			    NULL, SPI_XFER_ONCE);
+
+		command[0] = SSD2825_DAT_MASK;
+		command[1] = cmd2;
+		dm_spi_xfer(dev, 9, &command,
+			    NULL, SPI_XFER_ONCE);
+	}
+
+	if (flags & SSD2825_DSI_SEND) {
+		u16 data = *(u16 *)buf;
+		data &= 0x00FF;
+
+		debug("%s: dsi command (0x%x)\n",
+		      __func__, data);
+
+		command[0] = SSD2825_DAT_MASK;
+		command[1] = data;
+		dm_spi_xfer(dev, 9, &command,
+			    NULL, SPI_XFER_ONCE);
+	}
+
+	return 0;
+}
+
+static int ssd2825_spi_read(struct udevice *dev, int reg,
+			    void *data, int flags)
+{
+	u8 command[2];
+
+	command[0] = SSD2825_CMD_MASK;
+	command[1] = SSD2825_SPI_READ_REG;
+	dm_spi_xfer(dev, 9, &command,
+		    NULL, SPI_XFER_ONCE);
+
+	command[0] = SSD2825_DAT_MASK;
+	command[1] = SSD2825_SPI_READ_REG_RESET;
+	dm_spi_xfer(dev, 9, &command,
+		    NULL, SPI_XFER_ONCE);
+
+	command[0] = SSD2825_DAT_MASK;
+	command[1] = 0;
+	dm_spi_xfer(dev, 9, &command,
+		    NULL, SPI_XFER_ONCE);
+
+	command[0] = SSD2825_CMD_MASK;
+	command[1] = reg;
+	dm_spi_xfer(dev, 9, &command,
+		    NULL, SPI_XFER_ONCE);
+
+	command[0] = SSD2825_CMD_MASK;
+	command[1] = SSD2825_SPI_READ_REG_RESET;
+	dm_spi_xfer(dev, 9, &command,
+		    NULL, SPI_XFER_ONCE);
+
+	dm_spi_xfer(dev, 16, NULL,
+		    (u8 *)data, SPI_XFER_ONCE);
+
+	return 0;
+}
+
+static void ssd2825_write_register(struct udevice *dev, u8 reg,
+				   u16 command)
+{
+	ssd2825_spi_write(dev, reg, &command,
+			  SSD2825_CMD_SEND |
+			  SSD2825_DAT_SEND);
+}
+
+static void ssd2825_write_dsi(struct udevice *dev, const u8 *command,
+			      int len)
+{
+	int i;
+
+	ssd2825_spi_write(dev, SSD2825_PACKET_SIZE_CTRL_REG_1, &len,
+			  SSD2825_CMD_SEND | SSD2825_DAT_SEND);
+
+	ssd2825_spi_write(dev, SSD2825_PACKET_DROP_REG, NULL,
+			  SSD2825_CMD_SEND);
+
+	for (i = 0; i < len; i++)
+		ssd2825_spi_write(dev, 0, &command[i], SSD2825_DSI_SEND);
+}
+
+static ssize_t ssd2825_bridge_transfer(struct mipi_dsi_host *host,
+				       const struct mipi_dsi_msg *msg)
+{
+	struct udevice *dev = (struct udevice *)host->dev;
+	u8 buf = *(u8 *)msg->tx_buf;
+	u16 config;
+	int ret;
+
+	ret = ssd2825_spi_read(dev, SSD2825_CONFIGURATION_REG,
+			       &config, 0);
+	if (ret)
+		return ret;
+
+	switch (msg->type) {
+	case MIPI_DSI_DCS_SHORT_WRITE:
+	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
+	case MIPI_DSI_DCS_LONG_WRITE:
+		config |= SSD2825_CONF_REG_DCS;
+		break;
+	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
+	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
+	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
+	case MIPI_DSI_GENERIC_LONG_WRITE:
+		config &= ~SSD2825_CONF_REG_DCS;
+		break;
+	default:
+		return 0;
+	}
+
+	ssd2825_write_register(dev, SSD2825_CONFIGURATION_REG, config);
+	ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+	ssd2825_write_dsi(dev, msg->tx_buf, msg->tx_len);
+
+	if (buf == MIPI_DCS_SET_DISPLAY_ON) {
+		ssd2825_write_register(dev, SSD2825_CONFIGURATION_REG,
+				SSD2825_CONF_REG_HS | SSD2825_CONF_REG_VEN |
+				SSD2825_CONF_REG_DCS | SSD2825_CONF_REG_ECD |
+				SSD2825_CONF_REG_EOT);
+		ssd2825_write_register(dev, SSD2825_PLL_CTRL_REG, 0x0001);
+		ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+	}
+
+	return 0;
+}
+
+static const struct mipi_dsi_host_ops ssd2825_bridge_host_ops = {
+	.transfer	= ssd2825_bridge_transfer,
+};
+
+/*
+ * PLL configuration register settings.
+ *
+ * See the "PLL Configuration Register Description" in the SSD2825 datasheet.
+ */
+static u16 construct_pll_config(struct ssd2825_bridge_priv *priv,
+				u32 desired_pll_freq_kbps, u32 reference_freq_khz)
+{
+	u32 div_factor = 1, mul_factor, fr = 0;
+
+	while (reference_freq_khz / (div_factor + 1) >= SSD2825_REF_MIN_CLK)
+		div_factor++;
+	if (div_factor > 31)
+		div_factor = 31;
+
+	mul_factor = DIV_ROUND_UP(desired_pll_freq_kbps * div_factor,
+				  reference_freq_khz);
+
+	priv->pll_freq_kbps = reference_freq_khz * mul_factor / div_factor;
+
+	if (priv->pll_freq_kbps >= 501000)
+		fr = 3;
+	else if (priv->pll_freq_kbps >= 251000)
+		fr = 2;
+	else if (priv->pll_freq_kbps >= 126000)
+		fr = 1;
+
+	return (fr << 14) | (div_factor << 8) | mul_factor;
+}
+
+static void ssd2825_setup_pll(struct udevice *dev)
+{
+	struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+	struct mipi_dsi_device *device = &priv->device;
+	struct display_timing *dt = &priv->timing;
+	u16 pll_config, lp_div;
+	u32 pclk_mult, tx_freq_khz, pd_lines;
+
+	tx_freq_khz = clk_get_rate(priv->tx_clk) / 1000;
+	pd_lines = mipi_dsi_pixel_format_to_bpp(device->format);
+	pclk_mult = pd_lines / device->lanes + 1;
+
+	pll_config = construct_pll_config(priv, pclk_mult *
+					  dt->pixelclock.typ / 1000,
+					  tx_freq_khz);
+
+	lp_div = priv->pll_freq_kbps / (SSD2825_LP_MIN_CLK * 8);
+
+	/* Disable PLL */
+	ssd2825_write_register(dev, SSD2825_PLL_CTRL_REG, 0x0000);
+	ssd2825_write_register(dev, SSD2825_LINE_CTRL_REG, 0x0001);
+
+	/* Set delays */
+	ssd2825_write_register(dev, SSD2825_DELAY_ADJ_REG_1, 0x2103);
+
+	/* Set PLL coeficients */
+	ssd2825_write_register(dev, SSD2825_PLL_CONFIGURATION_REG, pll_config);
+
+	/* Clock Control Register */
+	ssd2825_write_register(dev, SSD2825_CLOCK_CTRL_REG,
+			       SSD2828_LP_CLOCK_DIVIDER(lp_div));
+
+	/* Enable PLL */
+	ssd2825_write_register(dev, SSD2825_PLL_CTRL_REG, 0x0001);
+	ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+}
+
+static int ssd2825_bridge_enable_panel(struct udevice *dev)
+{
+	struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+	struct mipi_dsi_device *device = &priv->device;
+	struct display_timing *dt = &priv->timing;
+	int ret;
+
+	ret = clk_prepare_enable(priv->tx_clk);
+	if (ret) {
+		log_err("error enabling tx_clk (%d)\n", ret);
+		return ret;
+	}
+
+	ret = dm_gpio_set_value(&priv->power_gpio, 1);
+	if (ret) {
+		log_err("error changing power-gpios (%d)\n", ret);
+		return ret;
+	}
+	mdelay(10);
+
+	ret = dm_gpio_set_value(&priv->reset_gpio, 0);
+	if (ret) {
+		log_err("error changing reset-gpios (%d)\n", ret);
+		return ret;
+	}
+	mdelay(10);
+
+	ret = dm_gpio_set_value(&priv->reset_gpio, 1);
+	if (ret) {
+		log_err("error changing reset-gpios (%d)\n", ret);
+		return ret;
+	}
+	mdelay(10);
+
+	/* Perform panel HW setup */
+	ret = panel_enable_backlight(priv->panel);
+	if (ret)
+		return ret;
+
+	/* Perform SW reset */
+	ssd2825_write_register(dev, SSD2825_OPERATION_CTRL_REG, 0x0100);
+
+	/* Set panel timings */
+	ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_1,
+			       dt->vsync_len.typ << 8 | dt->hsync_len.typ);
+	ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_2,
+			       (dt->vsync_len.typ + dt->vback_porch.typ) << 8 |
+			       (dt->hsync_len.typ + dt->hback_porch.typ));
+	ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_3,
+			       dt->vfront_porch.typ << 8 | dt->hfront_porch.typ);
+	ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_4,
+			       dt->hactive.typ);
+	ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_5,
+			       dt->vactive.typ);
+	ssd2825_write_register(dev, SSD2825_RGB_INTERFACE_CTRL_REG_6,
+			       SSD2825_HSYNC_HIGH | SSD2825_VSYNC_HIGH |
+			       SSD2825_PCKL_HIGH | SSD2825_NON_BURST |
+			       (3 - device->format));
+	ssd2825_write_register(dev, SSD2825_LANE_CONFIGURATION_REG,
+			       device->lanes - 1);
+	ssd2825_write_register(dev, SSD2825_TEST_REG, 0x0004);
+
+	/* Call PLL configuration */
+	ssd2825_setup_pll(dev);
+
+	mdelay(10);
+
+	/* Initial DSI configuration register set */
+	ssd2825_write_register(dev, SSD2825_CONFIGURATION_REG,
+			       SSD2825_CONF_REG_CKE | SSD2825_CONF_REG_DCS |
+			       SSD2825_CONF_REG_ECD | SSD2825_CONF_REG_EOT);
+	ssd2825_write_register(dev, SSD2825_VC_CTRL_REG, 0x0000);
+
+	/* Set up SW panel configuration */
+	ret = panel_set_backlight(priv->panel, BACKLIGHT_DEFAULT);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int ssd2825_bridge_set_panel(struct udevice *dev, int percent)
+{
+	return 0;
+}
+
+static int ssd2825_bridge_panel_timings(struct udevice *dev,
+					struct display_timing *timing)
+{
+	struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+
+	memcpy(timing, &priv->timing, sizeof(*timing));
+
+	return 0;
+}
+
+static int ssd2825_bridge_probe(struct udevice *dev)
+{
+	struct ssd2825_bridge_priv *priv = dev_get_priv(dev);
+	struct spi_slave *slave = dev_get_parent_priv(dev);
+	struct mipi_dsi_device *device = &priv->device;
+	struct mipi_dsi_panel_plat *mipi_plat;
+	int ret;
+
+	ret = spi_claim_bus(slave);
+	if (ret) {
+		log_err("SPI bus allocation failed (%d)\n", ret);
+		return ret;
+	}
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev,
+					   "panel", &priv->panel);
+	if (ret) {
+		log_err("cannot get panel: ret=%d\n", ret);
+		return ret;
+	}
+
+	panel_get_display_timing(priv->panel, &priv->timing);
+
+	mipi_plat = dev_get_plat(priv->panel);
+	mipi_plat->device = device;
+
+	priv->host.dev = (struct device *)dev;
+	priv->host.ops = &ssd2825_bridge_host_ops;
+
+	device->host = &priv->host;
+	device->lanes = mipi_plat->lanes;
+	device->format = mipi_plat->format;
+	device->mode_flags = mipi_plat->mode_flags;
+
+	/* get panel gpios */
+	ret = gpio_request_by_name(dev, "power-gpios", 0,
+				   &priv->power_gpio, GPIOD_IS_OUT);
+	if (ret) {
+		log_err("could not decode power-gpios (%d)\n", ret);
+		return ret;
+	}
+
+	ret = gpio_request_by_name(dev, "reset-gpios", 0,
+				   &priv->reset_gpio, GPIOD_IS_OUT);
+	if (ret) {
+		log_err("could not decode reset-gpios (%d)\n", ret);
+		return ret;
+	}
+
+	/* get clk */
+	priv->tx_clk = devm_clk_get(dev, "tx_clk");
+	if (IS_ERR(priv->tx_clk)) {
+		log_err("cannot get tx_clk: %ld\n", PTR_ERR(priv->tx_clk));
+		return PTR_ERR(priv->tx_clk);
+	}
+
+	return 0;
+}
+
+static const struct panel_ops ssd2825_bridge_ops = {
+	.enable_backlight	= ssd2825_bridge_enable_panel,
+	.set_backlight		= ssd2825_bridge_set_panel,
+	.get_display_timing	= ssd2825_bridge_panel_timings,
+};
+
+static const struct udevice_id ssd2825_bridge_ids[] = {
+	{ .compatible = "solomon,ssd2825" },
+	{ }
+};
+
+U_BOOT_DRIVER(ssd2825) = {
+	.name		= "ssd2825",
+	.id		= UCLASS_PANEL,
+	.of_match	= ssd2825_bridge_ids,
+	.ops		= &ssd2825_bridge_ops,
+	.probe		= ssd2825_bridge_probe,
+	.priv_auto	= sizeof(struct ssd2825_bridge_priv),
+};
-- 
2.37.2



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