Add DRM bridge driver for Thine THC63LVD1024 LVDS to digital parallel
output converter.

Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
Reviewed-by: Andrzej Hajda <a.ha...@samsung.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
---
 drivers/gpu/drm/bridge/Kconfig        |   6 +
 drivers/gpu/drm/bridge/Makefile       |   1 +
 drivers/gpu/drm/bridge/thc63lvd1024.c | 212 ++++++++++++++++++++++++++++++++++
 3 files changed, 219 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/thc63lvd1024.c

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 3aa65bd..42c9c2d 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -93,6 +93,12 @@ config DRM_SII9234
          It is an I2C driver, that detects connection of MHL bridge
          and starts encapsulation of HDMI signal.
 
+config DRM_THINE_THC63LVD1024
+       tristate "Thine THC63LVD1024 LVDS decoder bridge"
+       depends on OF
+       ---help---
+         Thine THC63LVD1024 LVDS/parallel converter driver.
+
 config DRM_TOSHIBA_TC358767
        tristate "Toshiba TC358767 eDP bridge"
        depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 373eb28..fd90b16 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
 obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
 obj-$(CONFIG_DRM_SII902X) += sii902x.o
 obj-$(CONFIG_DRM_SII9234) += sii9234.o
+obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
 obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c 
b/drivers/gpu/drm/bridge/thc63lvd1024.c
new file mode 100644
index 0000000..c8fad9c
--- /dev/null
+++ b/drivers/gpu/drm/bridge/thc63lvd1024.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * THC63LVD1024 LVDS to parallel data DRM bridge driver.
+ *
+ * Copyright (C) 2018 Jacopo Mondi <jacopo+rene...@jmondi.org>
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_panel.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+enum thc63_ports {
+       THC63_LVDS_IN0,
+       THC63_LVDS_IN1,
+       THC63_RGB_OUT0,
+       THC63_RGB_OUT1,
+};
+
+struct thc63_dev {
+       struct device *dev;
+
+       struct regulator *vcc;
+
+       struct gpio_desc *pdwn;
+       struct gpio_desc *oe;
+
+       struct drm_bridge bridge;
+       struct drm_bridge *next;
+};
+
+static inline struct thc63_dev *to_thc63(struct drm_bridge *bridge)
+{
+       return container_of(bridge, struct thc63_dev, bridge);
+}
+
+static int thc63_attach(struct drm_bridge *bridge)
+{
+       struct thc63_dev *thc63 = to_thc63(bridge);
+
+       return drm_bridge_attach(bridge->encoder, thc63->next, bridge);
+}
+
+static void thc63_enable(struct drm_bridge *bridge)
+{
+       struct thc63_dev *thc63 = to_thc63(bridge);
+       int ret;
+
+       ret = regulator_enable(thc63->vcc);
+       if (ret) {
+               dev_err(thc63->dev,
+                       "Failed to enable regulator \"vcc\": %d\n", ret);
+               return;
+       }
+
+       if (thc63->pdwn)
+               gpiod_set_value(thc63->pdwn, 0);
+
+       if (thc63->oe)
+               gpiod_set_value(thc63->oe, 1);
+}
+
+static void thc63_disable(struct drm_bridge *bridge)
+{
+       struct thc63_dev *thc63 = to_thc63(bridge);
+       int ret;
+
+       if (thc63->oe)
+               gpiod_set_value(thc63->oe, 0);
+
+       if (thc63->pdwn)
+               gpiod_set_value(thc63->pdwn, 1);
+
+       ret = regulator_disable(thc63->vcc);
+       if (ret)
+               dev_err(thc63->dev,
+                       "Failed to disable regulator \"vcc\": %d\n", ret);
+}
+
+static const struct drm_bridge_funcs thc63_bridge_func = {
+       .attach = thc63_attach,
+       .enable = thc63_enable,
+       .disable = thc63_disable,
+};
+
+static int thc63_parse_dt(struct thc63_dev *thc63)
+{
+       struct device_node *thc63_out;
+       struct device_node *remote;
+
+       thc63_out = of_graph_get_endpoint_by_regs(thc63->dev->of_node,
+                                                 THC63_RGB_OUT0, -1);
+       if (!thc63_out) {
+               dev_err(thc63->dev, "Missing endpoint in port@%u\n",
+                       THC63_RGB_OUT0);
+               return -ENODEV;
+       }
+
+       remote = of_graph_get_remote_port_parent(thc63_out);
+       of_node_put(thc63_out);
+       if (!remote) {
+               dev_err(thc63->dev, "Endpoint in port@%u unconnected\n",
+                       THC63_RGB_OUT0);
+               return -ENODEV;
+       }
+
+       if (!of_device_is_available(remote)) {
+               dev_err(thc63->dev, "port@%u remote endpoint is disabled\n",
+                       THC63_RGB_OUT0);
+               of_node_put(remote);
+               return -ENODEV;
+       }
+
+       thc63->next = of_drm_find_bridge(remote);
+       if (!thc63->next) {
+               of_node_put(remote);
+               return -EPROBE_DEFER;
+       }
+
+       return 0;
+}
+
+static int thc63_gpio_init(struct thc63_dev *thc63)
+{
+       thc63->oe = devm_gpiod_get_optional(thc63->dev, "enable", 
GPIOD_OUT_LOW);
+       if (IS_ERR(thc63->oe)) {
+               dev_err(thc63->dev, "Unable to get \"enable-gpios\": %ld\n",
+                       PTR_ERR(thc63->oe));
+               return PTR_ERR(thc63->oe);
+       }
+
+       thc63->pdwn = devm_gpiod_get_optional(thc63->dev, "powerdown",
+                                             GPIOD_OUT_HIGH);
+       if (IS_ERR(thc63->pdwn)) {
+               dev_err(thc63->dev, "Unable to get \"powerdown-gpios\": %ld\n",
+                       PTR_ERR(thc63->pdwn));
+               return PTR_ERR(thc63->pdwn);
+       }
+
+       return 0;
+}
+
+static int thc63_probe(struct platform_device *pdev)
+{
+       struct thc63_dev *thc63;
+       int ret;
+
+       thc63 = devm_kzalloc(&pdev->dev, sizeof(*thc63), GFP_KERNEL);
+       if (!thc63)
+               return -ENOMEM;
+
+       thc63->dev = &pdev->dev;
+       platform_set_drvdata(pdev, thc63);
+
+       thc63->vcc = devm_regulator_get(thc63->dev, "vcc");
+       if (IS_ERR(thc63->vcc)) {
+               if (PTR_ERR(thc63->vcc) == -EPROBE_DEFER)
+                       return -EPROBE_DEFER;
+
+               dev_err(thc63->dev, "Unable to get \"vcc\" supply: %ld\n",
+                       PTR_ERR(thc63->vcc));
+               return PTR_ERR(thc63->vcc);
+       }
+
+       ret = thc63_gpio_init(thc63);
+       if (ret)
+               return ret;
+
+       ret = thc63_parse_dt(thc63);
+       if (ret)
+               return ret;
+
+       thc63->bridge.driver_private = thc63;
+       thc63->bridge.of_node = pdev->dev.of_node;
+       thc63->bridge.funcs = &thc63_bridge_func;
+
+       drm_bridge_add(&thc63->bridge);
+
+       return 0;
+}
+
+static int thc63_remove(struct platform_device *pdev)
+{
+       struct thc63_dev *thc63 = platform_get_drvdata(pdev);
+
+       drm_bridge_remove(&thc63->bridge);
+
+       return 0;
+}
+
+static const struct of_device_id thc63_match[] = {
+       { .compatible = "thine,thc63lvd1024", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, thc63_match);
+
+static struct platform_driver thc63_driver = {
+       .probe  = thc63_probe,
+       .remove = thc63_remove,
+       .driver = {
+               .name           = "thc63lvd1024",
+               .of_match_table = thc63_match,
+       },
+};
+module_platform_driver(thc63_driver);
+
+MODULE_AUTHOR("Jacopo Mondi <jac...@jmondi.org>");
+MODULE_DESCRIPTION("Thine THC63LVD1024 LVDS decoder DRM bridge driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

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