1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright (C) 2015-2016 Free Electrons
4  * Copyright (C) 2015-2016 NextThing Co
6  * Maxime Ripard <maxime.ripard@free-electrons.com>
29 	struct drm_bridge	bridge;  member
36 	struct gpio_desc	*enable;  member
40 drm_bridge_to_simple_bridge(struct drm_bridge *bridge)  in drm_bridge_to_simple_bridge()  argument
42 	return container_of(bridge, struct simple_bridge, bridge);  in drm_bridge_to_simple_bridge()
57 	if (sbridge->next_bridge->ops & DRM_BRIDGE_OP_EDID) {  in simple_bridge_get_modes()
58 		drm_edid = drm_bridge_edid_read(sbridge->next_bridge, connector);  in simple_bridge_get_modes()
70 		 * bus from the next bridge), fallback on the XGA standards and  in simple_bridge_get_modes()
93 	return drm_bridge_detect(sbridge->next_bridge);  in simple_bridge_connector_detect()
105 static int simple_bridge_attach(struct drm_bridge *bridge,  in simple_bridge_attach()  argument
108 	struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);  in simple_bridge_attach()
111 	ret = drm_bridge_attach(bridge->encoder, sbridge->next_bridge, bridge,  in simple_bridge_attach()
119 	drm_connector_helper_add(&sbridge->connector,  in simple_bridge_attach()
121 	ret = drm_connector_init_with_ddc(bridge->dev, &sbridge->connector,  in simple_bridge_attach()
123 					  sbridge->info->connector_type,  in simple_bridge_attach()
124 					  sbridge->next_bridge->ddc);  in simple_bridge_attach()
130 	drm_connector_attach_encoder(&sbridge->connector, bridge->encoder);  in simple_bridge_attach()
135 static void simple_bridge_enable(struct drm_bridge *bridge)  in simple_bridge_enable()  argument
137 	struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);  in simple_bridge_enable()
140 	if (sbridge->vdd) {  in simple_bridge_enable()
141 		ret = regulator_enable(sbridge->vdd);  in simple_bridge_enable()
143 			DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);  in simple_bridge_enable()
146 	gpiod_set_value_cansleep(sbridge->enable, 1);  in simple_bridge_enable()
149 static void simple_bridge_disable(struct drm_bridge *bridge)  in simple_bridge_disable()  argument
151 	struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);  in simple_bridge_disable()
153 	gpiod_set_value_cansleep(sbridge->enable, 0);  in simple_bridge_disable()
155 	if (sbridge->vdd)  in simple_bridge_disable()
156 		regulator_disable(sbridge->vdd);  in simple_bridge_disable()
161 	.enable		= simple_bridge_enable,
170 	sbridge = devm_kzalloc(&pdev->dev, sizeof(*sbridge), GFP_KERNEL);  in simple_bridge_probe()
172 		return -ENOMEM;  in simple_bridge_probe()
174 	sbridge->info = of_device_get_match_data(&pdev->dev);  in simple_bridge_probe()
176 	/* Get the next bridge in the pipeline. */  in simple_bridge_probe()
177 	remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);  in simple_bridge_probe()
179 		return -EINVAL;  in simple_bridge_probe()
181 	sbridge->next_bridge = of_drm_find_bridge(remote);  in simple_bridge_probe()
184 	if (!sbridge->next_bridge) {  in simple_bridge_probe()
185 		dev_dbg(&pdev->dev, "Next bridge not found, deferring probe\n");  in simple_bridge_probe()
186 		return -EPROBE_DEFER;  in simple_bridge_probe()
190 	sbridge->vdd = devm_regulator_get_optional(&pdev->dev, "vdd");  in simple_bridge_probe()
191 	if (IS_ERR(sbridge->vdd)) {  in simple_bridge_probe()
192 		int ret = PTR_ERR(sbridge->vdd);  in simple_bridge_probe()
193 		if (ret == -EPROBE_DEFER)  in simple_bridge_probe()
194 			return -EPROBE_DEFER;  in simple_bridge_probe()
195 		sbridge->vdd = NULL;  in simple_bridge_probe()
196 		dev_dbg(&pdev->dev, "No vdd regulator found: %d\n", ret);  in simple_bridge_probe()
199 	sbridge->enable = devm_gpiod_get_optional(&pdev->dev, "enable",  in simple_bridge_probe()
201 	if (IS_ERR(sbridge->enable))  in simple_bridge_probe()
202 		return dev_err_probe(&pdev->dev, PTR_ERR(sbridge->enable),  in simple_bridge_probe()
203 				     "Unable to retrieve enable GPIO\n");  in simple_bridge_probe()
205 	/* Register the bridge. */  in simple_bridge_probe()
206 	sbridge->bridge.funcs = &simple_bridge_bridge_funcs;  in simple_bridge_probe()
207 	sbridge->bridge.of_node = pdev->dev.of_node;  in simple_bridge_probe()
208 	sbridge->bridge.timings = sbridge->info->timings;  in simple_bridge_probe()
210 	return devm_drm_bridge_add(&pdev->dev, &sbridge->bridge);  in simple_bridge_probe()
253 		.compatible = "dumb-vga-dac",
288 		.name		= "simple-bridge",
294 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
295 MODULE_DESCRIPTION("Simple DRM bridge driver");