Add DRM bridge driver for Thine THC63LVD1024 LVDS to digital parallel output converter.
Signed-off-by: Jacopo Mondi jacopo+renesas@jmondi.org --- 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..067f231 --- /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 %u\n", 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 %u\n", 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; +} + +#ifdef CONFIG_OF +static const struct of_device_id thc63_match[] = { + { .compatible = "thine,thc63lvd1024", }, + { }, +}; +MODULE_DEVICE_TABLE(of, thc63_match); +#endif + +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");