forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
146 lines
4.0 KiB
146 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* phy-can-transceiver.c - phy driver for CAN transceivers |
|
* |
|
* Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com |
|
* |
|
*/ |
|
#include<linux/phy/phy.h> |
|
#include<linux/platform_device.h> |
|
#include<linux/module.h> |
|
#include<linux/gpio.h> |
|
#include<linux/gpio/consumer.h> |
|
|
|
struct can_transceiver_data { |
|
u32 flags; |
|
#define CAN_TRANSCEIVER_STB_PRESENT BIT(0) |
|
#define CAN_TRANSCEIVER_EN_PRESENT BIT(1) |
|
}; |
|
|
|
struct can_transceiver_phy { |
|
struct phy *generic_phy; |
|
struct gpio_desc *standby_gpio; |
|
struct gpio_desc *enable_gpio; |
|
}; |
|
|
|
/* Power on function */ |
|
static int can_transceiver_phy_power_on(struct phy *phy) |
|
{ |
|
struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); |
|
|
|
if (can_transceiver_phy->standby_gpio) |
|
gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0); |
|
if (can_transceiver_phy->enable_gpio) |
|
gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 1); |
|
|
|
return 0; |
|
} |
|
|
|
/* Power off function */ |
|
static int can_transceiver_phy_power_off(struct phy *phy) |
|
{ |
|
struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); |
|
|
|
if (can_transceiver_phy->standby_gpio) |
|
gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1); |
|
if (can_transceiver_phy->enable_gpio) |
|
gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct phy_ops can_transceiver_phy_ops = { |
|
.power_on = can_transceiver_phy_power_on, |
|
.power_off = can_transceiver_phy_power_off, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static const struct can_transceiver_data tcan1042_drvdata = { |
|
.flags = CAN_TRANSCEIVER_STB_PRESENT, |
|
}; |
|
|
|
static const struct can_transceiver_data tcan1043_drvdata = { |
|
.flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_EN_PRESENT, |
|
}; |
|
|
|
static const struct of_device_id can_transceiver_phy_ids[] = { |
|
{ |
|
.compatible = "ti,tcan1042", |
|
.data = &tcan1042_drvdata |
|
}, |
|
{ |
|
.compatible = "ti,tcan1043", |
|
.data = &tcan1043_drvdata |
|
}, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, can_transceiver_phy_ids); |
|
|
|
static int can_transceiver_phy_probe(struct platform_device *pdev) |
|
{ |
|
struct phy_provider *phy_provider; |
|
struct device *dev = &pdev->dev; |
|
struct can_transceiver_phy *can_transceiver_phy; |
|
const struct can_transceiver_data *drvdata; |
|
const struct of_device_id *match; |
|
struct phy *phy; |
|
struct gpio_desc *standby_gpio; |
|
struct gpio_desc *enable_gpio; |
|
u32 max_bitrate = 0; |
|
|
|
can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL); |
|
if (!can_transceiver_phy) |
|
return -ENOMEM; |
|
|
|
match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node); |
|
drvdata = match->data; |
|
|
|
phy = devm_phy_create(dev, dev->of_node, |
|
&can_transceiver_phy_ops); |
|
if (IS_ERR(phy)) { |
|
dev_err(dev, "failed to create can transceiver phy\n"); |
|
return PTR_ERR(phy); |
|
} |
|
|
|
device_property_read_u32(dev, "max-bitrate", &max_bitrate); |
|
if (!max_bitrate) |
|
dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n"); |
|
phy->attrs.max_link_rate = max_bitrate; |
|
|
|
can_transceiver_phy->generic_phy = phy; |
|
|
|
if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) { |
|
standby_gpio = devm_gpiod_get(dev, "standby", GPIOD_OUT_HIGH); |
|
if (IS_ERR(standby_gpio)) |
|
return PTR_ERR(standby_gpio); |
|
can_transceiver_phy->standby_gpio = standby_gpio; |
|
} |
|
|
|
if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) { |
|
enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); |
|
if (IS_ERR(enable_gpio)) |
|
return PTR_ERR(enable_gpio); |
|
can_transceiver_phy->enable_gpio = enable_gpio; |
|
} |
|
|
|
phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy); |
|
|
|
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
|
|
|
return PTR_ERR_OR_ZERO(phy_provider); |
|
} |
|
|
|
static struct platform_driver can_transceiver_phy_driver = { |
|
.probe = can_transceiver_phy_probe, |
|
.driver = { |
|
.name = "can-transceiver-phy", |
|
.of_match_table = can_transceiver_phy_ids, |
|
}, |
|
}; |
|
|
|
module_platform_driver(can_transceiver_phy_driver); |
|
|
|
MODULE_AUTHOR("Faiz Abbas <[email protected]>"); |
|
MODULE_AUTHOR("Aswath Govindraju <[email protected]>"); |
|
MODULE_DESCRIPTION("CAN TRANSCEIVER PHY driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|