diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/ti-tdp158.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/ti-tdp158.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/ti-tdp158.c b/drivers/gpu/drm/bridge/ti-tdp158.c new file mode 100644 index 000000000000..3472ed5924e8 --- /dev/null +++ b/drivers/gpu/drm/bridge/ti-tdp158.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2024 Freebox SAS + */ + +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> + +struct tdp158 { + struct drm_bridge bridge; + struct drm_bridge *next; + struct gpio_desc *enable; // Operation Enable - pin 36 + struct regulator *vcc; // 3.3V + struct regulator *vdd; // 1.1V + struct device *dev; +}; + +static void tdp158_enable(struct drm_bridge *bridge, struct drm_bridge_state *prev) +{ + int err; + struct tdp158 *tdp158 = bridge->driver_private; + + err = regulator_enable(tdp158->vcc); + if (err) + dev_err(tdp158->dev, "failed to enable vcc: %d", err); + + err = regulator_enable(tdp158->vdd); + if (err) + dev_err(tdp158->dev, "failed to enable vdd: %d", err); + + gpiod_set_value_cansleep(tdp158->enable, 1); +} + +static void tdp158_disable(struct drm_bridge *bridge, struct drm_bridge_state *prev) +{ + struct tdp158 *tdp158 = bridge->driver_private; + + gpiod_set_value_cansleep(tdp158->enable, 0); + regulator_disable(tdp158->vdd); + regulator_disable(tdp158->vcc); +} + +static int tdp158_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) +{ + struct tdp158 *tdp158 = bridge->driver_private; + + return drm_bridge_attach(bridge->encoder, tdp158->next, bridge, flags); +} + +static const struct drm_bridge_funcs tdp158_bridge_funcs = { + .attach = tdp158_attach, + .atomic_enable = tdp158_enable, + .atomic_disable = tdp158_disable, + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, + .atomic_reset = drm_atomic_helper_bridge_reset, +}; + +static int tdp158_probe(struct i2c_client *client) +{ + struct tdp158 *tdp158; + struct device *dev = &client->dev; + + tdp158 = devm_kzalloc(dev, sizeof(*tdp158), GFP_KERNEL); + if (!tdp158) + return -ENOMEM; + + tdp158->next = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); + if (IS_ERR(tdp158->next)) + return dev_err_probe(dev, PTR_ERR(tdp158->next), "missing bridge"); + + tdp158->vcc = devm_regulator_get(dev, "vcc"); + if (IS_ERR(tdp158->vcc)) + return dev_err_probe(dev, PTR_ERR(tdp158->vcc), "vcc"); + + tdp158->vdd = devm_regulator_get(dev, "vdd"); + if (IS_ERR(tdp158->vdd)) + return dev_err_probe(dev, PTR_ERR(tdp158->vdd), "vdd"); + + tdp158->enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(tdp158->enable)) + return dev_err_probe(dev, PTR_ERR(tdp158->enable), "enable"); + + tdp158->bridge.of_node = dev->of_node; + tdp158->bridge.funcs = &tdp158_bridge_funcs; + tdp158->bridge.driver_private = tdp158; + tdp158->dev = dev; + + return devm_drm_bridge_add(dev, &tdp158->bridge); +} + +static const struct of_device_id tdp158_match_table[] = { + { .compatible = "ti,tdp158" }, + { } +}; +MODULE_DEVICE_TABLE(of, tdp158_match_table); + +static struct i2c_driver tdp158_driver = { + .probe = tdp158_probe, + .driver = { + .name = "tdp158", + .of_match_table = tdp158_match_table, + }, +}; +module_i2c_driver(tdp158_driver); + +MODULE_DESCRIPTION("TI TDP158 driver"); +MODULE_LICENSE("GPL"); |