1 // SPDX-License-Identifier: GPL-2.0-only
3  * NXP PTN3460 DP/LVDS bridge driver
31 	struct drm_bridge bridge;  member
40 		bridge_to_ptn3460(struct drm_bridge *bridge)  in bridge_to_ptn3460()  argument
42 	return container_of(bridge, struct ptn3460_bridge, bridge);  in bridge_to_ptn3460()
56 	ret = i2c_master_send(ptn_bridge->client, &addr, 1);  in ptn3460_read_bytes()
62 	ret = i2c_master_recv(ptn_bridge->client, buf, len);  in ptn3460_read_bytes()
80 	ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));  in ptn3460_write_byte()
96 			ptn_bridge->edid_emulation);  in ptn3460_select_edid()
104 		ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;  in ptn3460_select_edid()
115 static void ptn3460_pre_enable(struct drm_bridge *bridge)  in ptn3460_pre_enable()  argument
117 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);  in ptn3460_pre_enable()
120 	if (ptn_bridge->enabled)  in ptn3460_pre_enable()
123 	gpiod_set_value(ptn_bridge->gpio_pd_n, 1);  in ptn3460_pre_enable()
125 	gpiod_set_value(ptn_bridge->gpio_rst_n, 0);  in ptn3460_pre_enable()
127 	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);  in ptn3460_pre_enable()
140 	ptn_bridge->enabled = true;  in ptn3460_pre_enable()
143 static void ptn3460_disable(struct drm_bridge *bridge)  in ptn3460_disable()  argument
145 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);  in ptn3460_disable()
147 	if (!ptn_bridge->enabled)  in ptn3460_disable()
150 	ptn_bridge->enabled = false;  in ptn3460_disable()
152 	gpiod_set_value(ptn_bridge->gpio_rst_n, 1);  in ptn3460_disable()
153 	gpiod_set_value(ptn_bridge->gpio_pd_n, 0);  in ptn3460_disable()
157 static const struct drm_edid *ptn3460_edid_read(struct drm_bridge *bridge,  in ptn3460_edid_read()  argument
160 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);  in ptn3460_edid_read()
166 	power_off = !ptn_bridge->enabled;  in ptn3460_edid_read()
167 	ptn3460_pre_enable(&ptn_bridge->bridge);  in ptn3460_edid_read()
186 		ptn3460_disable(&ptn_bridge->bridge);  in ptn3460_edid_read()
197 	drm_edid = ptn3460_edid_read(&ptn_bridge->bridge, connector);  in ptn3460_connector_get_modes()
217 static int ptn3460_bridge_attach(struct drm_bridge *bridge,  in ptn3460_bridge_attach()  argument
220 	struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);  in ptn3460_bridge_attach()
224 	ret = drm_bridge_attach(bridge->encoder, ptn_bridge->panel_bridge,  in ptn3460_bridge_attach()
225 				bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR);  in ptn3460_bridge_attach()
232 	ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;  in ptn3460_bridge_attach()
233 	ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,  in ptn3460_bridge_attach()
239 	drm_connector_helper_add(&ptn_bridge->connector,  in ptn3460_bridge_attach()
241 	drm_connector_register(&ptn_bridge->connector);  in ptn3460_bridge_attach()
242 	drm_connector_attach_encoder(&ptn_bridge->connector,  in ptn3460_bridge_attach()
243 							bridge->encoder);  in ptn3460_bridge_attach()
245 	drm_helper_hpd_irq_event(ptn_bridge->connector.dev);  in ptn3460_bridge_attach()
259 	struct device *dev = &client->dev;  in ptn3460_probe()
266 		return -ENOMEM;  in ptn3460_probe()
269 	panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);  in ptn3460_probe()
273 	ptn_bridge->panel_bridge = panel_bridge;  in ptn3460_probe()
274 	ptn_bridge->client = client;  in ptn3460_probe()
276 	ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown",  in ptn3460_probe()
278 	if (IS_ERR(ptn_bridge->gpio_pd_n)) {  in ptn3460_probe()
279 		ret = PTR_ERR(ptn_bridge->gpio_pd_n);  in ptn3460_probe()
285 	 * Request the reset pin low to avoid the bridge being  in ptn3460_probe()
288 	ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",  in ptn3460_probe()
290 	if (IS_ERR(ptn_bridge->gpio_rst_n)) {  in ptn3460_probe()
291 		ret = PTR_ERR(ptn_bridge->gpio_rst_n);  in ptn3460_probe()
296 	ret = of_property_read_u32(dev->of_node, "edid-emulation",  in ptn3460_probe()
297 			&ptn_bridge->edid_emulation);  in ptn3460_probe()
303 	ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;  in ptn3460_probe()
304 	ptn_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;  in ptn3460_probe()
305 	ptn_bridge->bridge.type = DRM_MODE_CONNECTOR_LVDS;  in ptn3460_probe()
306 	ptn_bridge->bridge.of_node = dev->of_node;  in ptn3460_probe()
307 	drm_bridge_add(&ptn_bridge->bridge);  in ptn3460_probe()
318 	drm_bridge_remove(&ptn_bridge->bridge);  in ptn3460_remove()
345 MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");