drm: bridge: Add thc63lvd1024 LVDS decoder driver (cdc33b86) · Commits · 戴 / test

drivers/gpu/drm/bridge/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -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

drivers/gpu/drm/bridge/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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/

drivers/gpu/drm/bridge/thc63lvd1024.c

0 → 100644

+206 −0

Original line number	Diff line number	Diff line
		// 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>
		#include <linux/slab.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;
		}

		gpiod_set_value(thc63->pdwn, 0);
		gpiod_set_value(thc63->oe, 1);
		}

		static void thc63_disable(struct drm_bridge *bridge)
		{
		struct thc63_dev *thc63 = to_thc63(bridge);
		int ret;

		gpiod_set_value(thc63->oe, 0);
		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);
		of_node_put(remote);
		if (!thc63->next)
		return -EPROBE_DEFER;

		return 0;
		}

		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\": %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_optional(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 <jacopo@jmondi.org>");
		MODULE_DESCRIPTION("Thine THC63LVD1024 LVDS decoder DRM bridge driver");
		MODULE_LICENSE("GPL v2");

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