1 // SPDX-License-Identifier: GPL-2.0
41  * struct tpg110_panel_mode - lookup struct for the supported modes
63  * struct tpg110 - state container for the TPG110 panel
223 		 * The last bit/clock is Hi-Z turnaround cycle, so we need  in tpg110_readwrite_reg()
225 		 * turn-around cycle.  in tpg110_readwrite_reg()
238 	ret = spi_sync(tpg->spi, &m);  in tpg110_readwrite_reg()
240 		dev_err(tpg->dev, "SPI message error %d\n", ret);  in tpg110_readwrite_reg()
264 	/* De-assert the reset signal */  in tpg110_startup()
265 	gpiod_set_value_cansleep(tpg->grestb, 0);  in tpg110_startup()
267 	dev_dbg(tpg->dev, "de-asserted GRESTB\n");  in tpg110_startup()
273 		dev_err(tpg->dev, "failed communication test\n");  in tpg110_startup()
274 		return -ENODEV;  in tpg110_startup()
278 	dev_info(tpg->dev, "TPG110 chip ID: %d version: %d\n",  in tpg110_startup()
286 		dev_info(tpg->dev, "IN 400x240 RGB -> OUT 800x480 RGB (dual scan)\n");  in tpg110_startup()
289 		dev_info(tpg->dev, "IN 480x272 RGB -> OUT 800x480 RGB (dual scan)\n");  in tpg110_startup()
292 		dev_info(tpg->dev, "480x640 RGB\n");  in tpg110_startup()
295 		dev_info(tpg->dev, "480x272 RGB\n");  in tpg110_startup()
298 		dev_info(tpg->dev, "640x480 RGB\n");  in tpg110_startup()
301 		dev_info(tpg->dev, "800x480 RGB\n");  in tpg110_startup()
304 		dev_err(tpg->dev, "ILLEGAL RESOLUTION 0x%02x\n", val);  in tpg110_startup()
316 		if (pm->magic == val) {  in tpg110_startup()
317 			tpg->panel_mode = pm;  in tpg110_startup()
322 		dev_err(tpg->dev, "unsupported mode (%02x) detected\n", val);  in tpg110_startup()
323 		return -ENODEV;  in tpg110_startup()
327 	dev_info(tpg->dev, "resolution and standby is controlled by %s\n",  in tpg110_startup()
363  * tpg110_get_modes() - return the appropriate mode
377 	connector->display_info.width_mm = tpg->width;  in tpg110_get_modes()
378 	connector->display_info.height_mm = tpg->height;  in tpg110_get_modes()
379 	connector->display_info.bus_flags = tpg->panel_mode->bus_flags;  in tpg110_get_modes()
381 	mode = drm_mode_duplicate(connector->dev, &tpg->panel_mode->mode);  in tpg110_get_modes()
383 		return -ENOMEM;  in tpg110_get_modes()
385 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;  in tpg110_get_modes()
387 	mode->width_mm = tpg->width;  in tpg110_get_modes()
388 	mode->height_mm = tpg->height;  in tpg110_get_modes()
403 	struct device *dev = &spi->dev;  in tpg110_probe()
404 	struct device_node *np = dev->of_node;  in tpg110_probe()
410 		return -ENOMEM;  in tpg110_probe()
411 	tpg->dev = dev;  in tpg110_probe()
414 	ret = of_property_read_u32(np, "width-mm", &tpg->width);  in tpg110_probe()
417 	ret = of_property_read_u32(np, "height-mm", &tpg->height);  in tpg110_probe()
421 	/* This asserts the GRESTB signal, putting the display into reset */  in tpg110_probe()
422 	tpg->grestb = devm_gpiod_get(dev, "grestb", GPIOD_OUT_HIGH);  in tpg110_probe()
423 	if (IS_ERR(tpg->grestb)) {  in tpg110_probe()
425 		return -ENODEV;  in tpg110_probe()
428 	spi->bits_per_word = 8;  in tpg110_probe()
429 	spi->mode |= SPI_3WIRE_HIZ;  in tpg110_probe()
435 	tpg->spi = spi;  in tpg110_probe()
441 	drm_panel_init(&tpg->panel, dev, &tpg110_drm_funcs,  in tpg110_probe()
444 	ret = drm_panel_of_backlight(&tpg->panel);  in tpg110_probe()
450 	drm_panel_add(&tpg->panel);  in tpg110_probe()
459 	drm_panel_remove(&tpg->panel);  in tpg110_remove()
479 		.name	= "tpo-tpg110-panel",