drm/bridge: Add driver for the TI TPD12S015 HDMI level shifter

The TI TPD12S015 is an HDMI level shifter and ESD protector controlled
through GPIOs. Add a DRM bridge driver for the device.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-17-laurent.pinchart@ideasonboard.com

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index d63283661850558e51c4521ab113217412929250..aaed2347ace9d8112ae508f6e9ee93b1027e8468 100644 (file)
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -172,6 +172,14 @@ config DRM_TI_SN65DSI86
        help
          Texas Instruments SN65DSI86 DSI to eDP Bridge driver
 
+config DRM_TI_TPD12S015
+       tristate "TI TPD12S015 HDMI level shifter and ESD protection"
+       depends on OF
+       select DRM_KMS_HELPER
+       help
+         Texas Instruments TPD12S015 HDMI level shifter and ESD protection
+         driver.
+
 source "drivers/gpu/drm/bridge/analogix/Kconfig"
 
 source "drivers/gpu/drm/bridge/adv7511/Kconfig"

diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 17f1f155e803bc7a641df62b18b75248673fc55e..6fb062b5b0f04e493dcb6cf6a89cefc10ff3ddad 100644 (file)
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
 obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
 obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
+obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o
 
 obj-y += analogix/
 obj-y += synopsys/

diff --git a/drivers/gpu/drm/bridge/ti-tpd12s015.c b/drivers/gpu/drm/bridge/ti-tpd12s015.c
new file mode 100644 (file)
index 0000000..514cbf0
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ti-tpd12s015.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TPD12S015 HDMI ESD protection & level shifter chip driver
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated
+ *
+ * Based on the omapdrm-specific encoder-opa362 driver
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_bridge.h>
+
+struct tpd12s015_device {
+       struct drm_bridge bridge;
+
+       struct gpio_desc *ct_cp_hpd_gpio;
+       struct gpio_desc *ls_oe_gpio;
+       struct gpio_desc *hpd_gpio;
+       int hpd_irq;
+
+       struct drm_bridge *next_bridge;
+};
+
+static inline struct tpd12s015_device *to_tpd12s015(struct drm_bridge *bridge)
+{
+       return container_of(bridge, struct tpd12s015_device, bridge);
+}
+
+static int tpd12s015_attach(struct drm_bridge *bridge,
+                           enum drm_bridge_attach_flags flags)
+{
+       struct tpd12s015_device *tpd = to_tpd12s015(bridge);
+       int ret;
+
+       if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
+               return -EINVAL;
+
+       ret = drm_bridge_attach(bridge->encoder, tpd->next_bridge,
+                               bridge, flags);
+       if (ret < 0)
+               return ret;
+
+       gpiod_set_value_cansleep(tpd->ls_oe_gpio, 1);
+
+       /* DC-DC converter needs at max 300us to get to 90% of 5V. */
+       usleep_range(300, 1000);
+
+       return 0;
+}
+
+static void tpd12s015_detach(struct drm_bridge *bridge)
+{
+       struct tpd12s015_device *tpd = to_tpd12s015(bridge);
+
+       gpiod_set_value_cansleep(tpd->ls_oe_gpio, 0);
+}
+
+static enum drm_connector_status tpd12s015_detect(struct drm_bridge *bridge)
+{
+       struct tpd12s015_device *tpd = to_tpd12s015(bridge);
+
+       if (gpiod_get_value_cansleep(tpd->hpd_gpio))
+               return connector_status_connected;
+       else
+               return connector_status_disconnected;
+}
+
+static void tpd12s015_hpd_enable(struct drm_bridge *bridge)
+{
+       struct tpd12s015_device *tpd = to_tpd12s015(bridge);
+
+       gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 1);
+}
+
+static void tpd12s015_hpd_disable(struct drm_bridge *bridge)
+{
+       struct tpd12s015_device *tpd = to_tpd12s015(bridge);
+
+       gpiod_set_value_cansleep(tpd->ct_cp_hpd_gpio, 0);
+}
+
+static const struct drm_bridge_funcs tpd12s015_bridge_funcs = {
+       .attach                 = tpd12s015_attach,
+       .detach                 = tpd12s015_detach,
+       .detect                 = tpd12s015_detect,
+       .hpd_enable             = tpd12s015_hpd_enable,
+       .hpd_disable            = tpd12s015_hpd_disable,
+};
+
+static irqreturn_t tpd12s015_hpd_isr(int irq, void *data)
+{
+       struct tpd12s015_device *tpd = data;
+       struct drm_bridge *bridge = &tpd->bridge;
+
+       drm_bridge_hpd_notify(bridge, tpd12s015_detect(bridge));
+
+       return IRQ_HANDLED;
+}
+
+static int tpd12s015_probe(struct platform_device *pdev)
+{
+       struct tpd12s015_device *tpd;
+       struct device_node *node;
+       struct gpio_desc *gpio;
+       int ret;
+
+       tpd = devm_kzalloc(&pdev->dev, sizeof(*tpd), GFP_KERNEL);
+       if (!tpd)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, tpd);
+
+       tpd->bridge.funcs = &tpd12s015_bridge_funcs;
+       tpd->bridge.of_node = pdev->dev.of_node;
+       tpd->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
+       tpd->bridge.ops = DRM_BRIDGE_OP_DETECT;
+
+       /* Get the next bridge, connected to port@1. */
+       node = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
+       if (!node)
+               return -ENODEV;
+
+       tpd->next_bridge = of_drm_find_bridge(node);
+       of_node_put(node);
+
+       if (!tpd->next_bridge)
+               return -EPROBE_DEFER;
+
+       /* Get the control and HPD GPIOs. */
+       gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
+                                            GPIOD_OUT_LOW);
+       if (IS_ERR(gpio))
+               return PTR_ERR(gpio);
+
+       tpd->ct_cp_hpd_gpio = gpio;
+
+       gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
+                                            GPIOD_OUT_LOW);
+       if (IS_ERR(gpio))
+               return PTR_ERR(gpio);
+
+       tpd->ls_oe_gpio = gpio;
+
+       gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_IN);
+       if (IS_ERR(gpio))
+               return PTR_ERR(gpio);
+
+       tpd->hpd_gpio = gpio;
+
+       /* Register the IRQ if the HPD GPIO is IRQ-capable. */
+       tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
+       if (tpd->hpd_irq) {
+               ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
+                                               tpd12s015_hpd_isr,
+                                               IRQF_TRIGGER_RISING |
+                                               IRQF_TRIGGER_FALLING |
+                                               IRQF_ONESHOT,
+                                               "tpd12s015 hpd", tpd);
+               if (ret)
+                       return ret;
+
+               tpd->bridge.ops |= DRM_BRIDGE_OP_HPD;
+       }
+
+       /* Register the DRM bridge. */
+       drm_bridge_add(&tpd->bridge);
+
+       return 0;
+}
+
+static int __exit tpd12s015_remove(struct platform_device *pdev)
+{
+       struct tpd12s015_device *tpd = platform_get_drvdata(pdev);
+
+       drm_bridge_remove(&tpd->bridge);
+
+       return 0;
+}
+
+static const struct of_device_id tpd12s015_of_match[] = {
+       { .compatible = "ti,tpd12s015", },
+       {},
+};
+
+MODULE_DEVICE_TABLE(of, tpd12s015_of_match);
+
+static struct platform_driver tpd12s015_driver = {
+       .probe  = tpd12s015_probe,
+       .remove = __exit_p(tpd12s015_remove),
+       .driver = {
+               .name   = "tpd12s015",
+               .of_match_table = tpd12s015_of_match,
+       },
+};
+
+module_platform_driver(tpd12s015_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("TPD12S015 HDMI level shifter and ESD protection driver");
+MODULE_LICENSE("GPL");