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>
34 	struct gpio_desc	*enable;  member
37 static inline struct simple_bridge *
43 static inline struct simple_bridge *
49 static int simple_bridge_get_modes(struct drm_connector *connector)  in simple_bridge_get_modes()
55 	if (sbridge->next_bridge->ops & DRM_BRIDGE_OP_EDID) {  in simple_bridge_get_modes()
56 		edid = drm_bridge_get_edid(sbridge->next_bridge, connector);  in simple_bridge_get_modes()
81 static const struct drm_connector_helper_funcs simple_bridge_con_helper_funcs = {
85 static enum drm_connector_status
90 	return drm_bridge_detect(sbridge->next_bridge);  in simple_bridge_connector_detect()
93 static const struct drm_connector_funcs simple_bridge_con_funcs = {
102 static int simple_bridge_attach(struct drm_bridge *bridge,  in simple_bridge_attach()
108 	ret = drm_bridge_attach(bridge->encoder, sbridge->next_bridge, bridge,  in simple_bridge_attach()
116 	if (!bridge->encoder) {  in simple_bridge_attach()
118 		return -ENODEV;  in simple_bridge_attach()
121 	drm_connector_helper_add(&sbridge->connector,  in simple_bridge_attach()
123 	ret = drm_connector_init_with_ddc(bridge->dev, &sbridge->connector,  in simple_bridge_attach()
125 					  sbridge->info->connector_type,  in simple_bridge_attach()
126 					  sbridge->next_bridge->ddc);  in simple_bridge_attach()
132 	drm_connector_attach_encoder(&sbridge->connector, bridge->encoder);  in simple_bridge_attach()
137 static void simple_bridge_enable(struct drm_bridge *bridge)  in simple_bridge_enable()
142 	if (sbridge->vdd) {  in simple_bridge_enable()
143 		ret = regulator_enable(sbridge->vdd);  in simple_bridge_enable()
145 			DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);  in simple_bridge_enable()
148 	gpiod_set_value_cansleep(sbridge->enable, 1);  in simple_bridge_enable()
151 static void simple_bridge_disable(struct drm_bridge *bridge)  in simple_bridge_disable()
155 	gpiod_set_value_cansleep(sbridge->enable, 0);  in simple_bridge_disable()
157 	if (sbridge->vdd)  in simple_bridge_disable()
158 		regulator_disable(sbridge->vdd);  in simple_bridge_disable()
161 static const struct drm_bridge_funcs simple_bridge_bridge_funcs = {
163 	.enable		= simple_bridge_enable,
167 static int simple_bridge_probe(struct platform_device *pdev)  in simple_bridge_probe()
172 	sbridge = devm_kzalloc(&pdev->dev, sizeof(*sbridge), GFP_KERNEL);  in simple_bridge_probe()
174 		return -ENOMEM;  in simple_bridge_probe()
177 	sbridge->info = of_device_get_match_data(&pdev->dev);  in simple_bridge_probe()
180 	remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);  in simple_bridge_probe()
182 		return -EINVAL;  in simple_bridge_probe()
184 	sbridge->next_bridge = of_drm_find_bridge(remote);  in simple_bridge_probe()
187 	if (!sbridge->next_bridge) {  in simple_bridge_probe()
188 		dev_dbg(&pdev->dev, "Next bridge not found, deferring probe\n");  in simple_bridge_probe()
189 		return -EPROBE_DEFER;  in simple_bridge_probe()
193 	sbridge->vdd = devm_regulator_get_optional(&pdev->dev, "vdd");  in simple_bridge_probe()
194 	if (IS_ERR(sbridge->vdd)) {  in simple_bridge_probe()
195 		int ret = PTR_ERR(sbridge->vdd);  in simple_bridge_probe()
196 		if (ret == -EPROBE_DEFER)  in simple_bridge_probe()
197 			return -EPROBE_DEFER;  in simple_bridge_probe()
198 		sbridge->vdd = NULL;  in simple_bridge_probe()
199 		dev_dbg(&pdev->dev, "No vdd regulator found: %d\n", ret);  in simple_bridge_probe()
202 	sbridge->enable = devm_gpiod_get_optional(&pdev->dev, "enable",  in simple_bridge_probe()
204 	if (IS_ERR(sbridge->enable)) {  in simple_bridge_probe()
205 		if (PTR_ERR(sbridge->enable) != -EPROBE_DEFER)  in simple_bridge_probe()
206 			dev_err(&pdev->dev, "Unable to retrieve enable GPIO\n");  in simple_bridge_probe()
207 		return PTR_ERR(sbridge->enable);  in simple_bridge_probe()
211 	sbridge->bridge.funcs = &simple_bridge_bridge_funcs;  in simple_bridge_probe()
212 	sbridge->bridge.of_node = pdev->dev.of_node;  in simple_bridge_probe()
213 	sbridge->bridge.timings = sbridge->info->timings;  in simple_bridge_probe()
215 	drm_bridge_add(&sbridge->bridge);  in simple_bridge_probe()
220 static int simple_bridge_remove(struct platform_device *pdev)  in simple_bridge_remove()
224 	drm_bridge_remove(&sbridge->bridge);  in simple_bridge_remove()
235 static const struct drm_bridge_timings default_bridge_timings = {
246 static const struct drm_bridge_timings ti_ths8134_bridge_timings = {
259 static const struct drm_bridge_timings ti_ths8135_bridge_timings = {
267 static const struct of_device_id simple_bridge_match[] = {
269 		.compatible = "dumb-vga-dac",
301 static struct platform_driver simple_bridge_driver = {
305 		.name		= "simple-bridge",
311 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");