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Subject[PATCH v6 2/3] drm: bridge: Add thc63lvd1024 LVDS decoder driver
Date
Add DRM bridge driver for Thine THC63LVD1024 LVDS to digital parallel
output converter.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
drivers/gpu/drm/bridge/Kconfig | 6 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/thc63lvd1024.c | 255 ++++++++++++++++++++++++++++++++++
3 files changed, 262 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 3b99d5a..5815a20 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -92,6 +92,12 @@ 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..02a54c2
--- /dev/null
+++ b/drivers/gpu/drm/bridge/thc63lvd1024.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * THC63LVD1024 LVDS to parallel data DRM bridge driver.
+ *
+ * Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@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_LVDS_IN0,
+ THC63_LVDS_IN1,
+ THC63_DIGITAL_OUT0,
+ THC63_DIGITAL_OUT1,
+};
+
+static const char * const thc63_reg_names[] = {
+ "vcc", "lvcc", "pvcc", "cvcc",
+};
+
+struct thc63_dev {
+ struct device *dev;
+
+ struct regulator *vccs[ARRAY_SIZE(thc63_reg_names)];
+
+ 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);
+ struct regulator *vcc;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++) {
+ vcc = thc63->vccs[i];
+ if (!vcc)
+ continue;
+
+ if (regulator_enable(vcc))
+ goto error_vcc_enable;
+ }
+
+ if (thc63->pdwn)
+ gpiod_set_value(thc63->pdwn, 0);
+
+ if (thc63->oe)
+ gpiod_set_value(thc63->oe, 1);
+
+ return;
+
+error_vcc_enable:
+ dev_err(thc63->dev, "Failed to enable regulator %s\n",
+ thc63_reg_names[i]);
+
+ for (i = i - 1; i >= 0; i--) {
+ vcc = thc63->vccs[i];
+ if (!vcc)
+ continue;
+
+ regulator_disable(vcc);
+ }
+}
+
+static void thc63_disable(struct drm_bridge *bridge)
+{
+ struct thc63_dev *thc63 = to_thc63(bridge);
+ struct regulator *vcc;
+ int i;
+
+ if (thc63->oe)
+ gpiod_set_value(thc63->oe, 0);
+
+ if (thc63->pdwn)
+ gpiod_set_value(thc63->pdwn, 1);
+
+ for (i = ARRAY_SIZE(thc63->vccs) - 1; i >= 0; i--) {
+ vcc = thc63->vccs[i];
+ if (!vcc)
+ continue;
+
+ if (regulator_disable(vcc))
+ dev_dbg(thc63->dev,
+ "Failed to disable regulator %s\n",
+ thc63_reg_names[i]);
+ }
+}
+
+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;
+ int ret = 0;
+
+ thc63_out = of_graph_get_endpoint_by_regs(thc63->dev->of_node,
+ THC63_DIGITAL_OUT0, -1);
+ if (!thc63_out) {
+ dev_err(thc63->dev, "Missing endpoint in Port@%u\n",
+ THC63_DIGITAL_OUT0);
+ return -ENODEV;
+ }
+
+ remote = of_graph_get_remote_port_parent(thc63_out);
+ if (!remote) {
+ dev_err(thc63->dev, "Endpoint in Port@%u unconnected\n",
+ THC63_DIGITAL_OUT0);
+ ret = -ENODEV;
+ goto error_put_out_node;
+ }
+
+ if (!of_device_is_available(remote)) {
+ dev_err(thc63->dev, "Port@%u remote endpoint is disabled\n",
+ THC63_DIGITAL_OUT0);
+ ret = -ENODEV;
+ goto error_put_remote_node;
+ }
+
+ thc63->next = of_drm_find_bridge(remote);
+ if (!thc63->next)
+ ret = -EPROBE_DEFER;
+
+error_put_remote_node:
+ of_node_put(remote);
+error_put_out_node:
+ of_node_put(thc63_out);
+
+ return ret;
+}
+
+static int thc63_gpio_init(struct thc63_dev *thc63)
+{
+ thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW);
+ if (IS_ERR(thc63->oe)) {
+ dev_err(thc63->dev, "Unable to get \"oe-gpios\"\n");
+ return PTR_ERR(thc63->oe);
+ }
+
+ thc63->pdwn = devm_gpiod_get_optional(thc63->dev, "pdwn",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(thc63->pdwn)) {
+ dev_err(thc63->dev, "Unable to get \"pdwn-gpios\"\n");
+ return PTR_ERR(thc63->pdwn);
+ }
+
+ return 0;
+}
+
+static int thc63_regulator_init(struct thc63_dev *thc63)
+{
+ struct regulator **reg;
+ int i;
+
+ reg = &thc63->vccs[0];
+ for (i = 0; i < ARRAY_SIZE(thc63->vccs); i++, reg++) {
+ *reg = devm_regulator_get_optional(thc63->dev,
+ thc63_reg_names[i]);
+ if (IS_ERR(*reg)) {
+ if (PTR_ERR(*reg) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ *reg = NULL;
+ }
+ }
+
+ 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);
+
+ ret = thc63_regulator_init(thc63);
+ if (ret)
+ return ret;
+
+ 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 <jacopo@jmondi.org>");
+MODULE_DESCRIPTION("Thine THC63LVD1024 LVDS decoder DRM bridge driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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