[PATCH 4/4] drm: bridge: simple-bridge: add tdp158 support

[Marc Gonzalez]

The TI TDP158 is an AC-Coupled HDMI signal to TMDS Redriver supporting
DVI 1.0 and HDMI 1.4b and 2.0b output signals.

Signed-off-by: Marc Gonzalez <mgonzalez at freebox.fr>
---
 drivers/gpu/drm/bridge/simple-bridge.c | 64 ++++++++++++++++++++++++++++++++--
 1 file changed, 61 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c
index f1e458a15882f..745d253e55f7e 100644
--- a/drivers/gpu/drm/bridge/simple-bridge.c
+++ b/drivers/gpu/drm/bridge/simple-bridge.c
@@ -6,6 +6,8 @@
  * Maxime Ripard <maxime.ripard at free-electrons.com>
  */
 
+#include <linux/i2c.h>
+#include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -32,6 +34,7 @@ struct simple_bridge {
 	const struct simple_bridge_info *info;
 
 	struct drm_bridge	*next_bridge;
+	struct regulator	*vcc;
 	struct regulator	*vdd;
 	struct gpio_desc	*enable;
 };
@@ -142,8 +145,16 @@ static void simple_bridge_enable(struct drm_bridge *bridge)
 	struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);
 	int ret;
 
+	if (sbridge->vcc) {
+		ret = regulator_enable(sbridge->vcc);
+		msleep(100);
+		if (ret)
+			DRM_ERROR("Failed to enable vcc regulator: %d\n", ret);
+	}
+
 	if (sbridge->vdd) {
 		ret = regulator_enable(sbridge->vdd);
+		msleep(100);
 		if (ret)
 			DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
 	}
@@ -159,6 +170,9 @@ static void simple_bridge_disable(struct drm_bridge *bridge)
 
 	if (sbridge->vdd)
 		regulator_disable(sbridge->vdd);
+
+	if (sbridge->vcc)
+		regulator_disable(sbridge->vcc);
 }
 
 static const struct drm_bridge_funcs simple_bridge_bridge_funcs = {
@@ -167,16 +181,14 @@ static const struct drm_bridge_funcs simple_bridge_bridge_funcs = {
 	.disable	= simple_bridge_disable,
 };
 
-static int simple_bridge_probe(struct platform_device *pdev)
+static int common_probe(struct device *dev, struct simple_bridge **res)
 {
-	struct device *dev = &pdev->dev;
 	struct simple_bridge *sbridge;
 	struct device_node *remote;
 
 	sbridge = devm_kzalloc(dev, sizeof(*sbridge), GFP_KERNEL);
 	if (!sbridge)
 		return -ENOMEM;
-	platform_set_drvdata(pdev, sbridge);
 
 	sbridge->info = of_device_get_match_data(dev);
 
@@ -203,6 +215,15 @@ static int simple_bridge_probe(struct platform_device *pdev)
 		dev_dbg(dev, "No vdd regulator found: %d\n", ret);
 	}
 
+	sbridge->vcc = devm_regulator_get_optional(dev, "vcc");
+	if (IS_ERR(sbridge->vcc)) {
+		int ret = PTR_ERR(sbridge->vcc);
+		if (ret == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		sbridge->vcc = NULL;
+		dev_dbg(dev, "No vcc regulator found: %d\n", ret);
+	}
+
 	sbridge->enable = devm_gpiod_get_optional(dev, "enable",
 						  GPIOD_OUT_LOW);
 	if (IS_ERR(sbridge->enable))
@@ -213,10 +234,27 @@ static int simple_bridge_probe(struct platform_device *pdev)
 	sbridge->bridge.funcs = &simple_bridge_bridge_funcs;
 	sbridge->bridge.of_node = dev->of_node;
 	sbridge->bridge.timings = sbridge->info->timings;
+	*res = sbridge;
 
 	return devm_drm_bridge_add(dev, &sbridge->bridge);
 }
 
+static int simple_bridge_probe(struct platform_device *pdev)
+{
+	struct simple_bridge *sbridge = NULL;
+	int err = common_probe(&pdev->dev, &sbridge);
+	platform_set_drvdata(pdev, sbridge);
+	return err;
+}
+
+static int i2c_probe(struct i2c_client *client)
+{
+	struct simple_bridge *sbridge = NULL;
+	int err = common_probe(&client->dev, &sbridge);
+	i2c_set_clientdata(client, sbridge);
+	return err;
+}
+
 /*
  * We assume the ADV7123 DAC is the "default" for historical reasons
  * Information taken from the ADV7123 datasheet, revision D.
@@ -298,6 +336,26 @@ static struct platform_driver simple_bridge_driver = {
 };
 module_platform_driver(simple_bridge_driver);
 
+static const struct of_device_id i2c_match_table[] = {
+	{
+		.compatible = "ti,tdp158",
+		.data = &(const struct simple_bridge_info) {
+			.connector_type = DRM_MODE_CONNECTOR_HDMIA,
+		},
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, i2c_match_table);
+
+static struct i2c_driver i2c_simple_bridge_driver = {
+	.probe = i2c_probe,
+	.driver = {
+		.name = "i2c-simple-bridge",
+		.of_match_table = i2c_match_table,
+	},
+};
+module_i2c_driver(i2c_simple_bridge_driver);
+
 MODULE_AUTHOR("Maxime Ripard <maxime.ripard at free-electrons.com>");
 MODULE_DESCRIPTION("Simple DRM bridge driver");
 MODULE_LICENSE("GPL");

-- 
2.34.1