phy: phy-can-transceiver: Add support for generic CAN transceiver driver

The driver adds support for generic CAN transceivers. Currently
the modes supported by this driver are standby and normal modes for TI
TCAN1042 and TCAN1043 CAN transceivers.

The transceiver is modelled as a phy with pins controlled by gpios, to put
the transceiver in various device functional modes. It also gets the phy
attribute max_link_rate for the usage of CAN drivers.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20210510051006.11393-4-a-govindraju@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Aswath Govindraju 2021-05-10 10:40:05 +05:30 committed by Vinod Koul
parent ad92330614
commit a4a86d273f
4 changed files with 157 additions and 0 deletions

View File

@ -4042,6 +4042,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git
F: Documentation/devicetree/bindings/net/can/ F: Documentation/devicetree/bindings/net/can/
F: Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml F: Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml
F: drivers/net/can/ F: drivers/net/can/
F: drivers/phy/phy-can-transceiver.c
F: include/linux/can/bittiming.h F: include/linux/can/bittiming.h
F: include/linux/can/dev.h F: include/linux/can/dev.h
F: include/linux/can/led.h F: include/linux/can/led.h

View File

@ -61,6 +61,15 @@ config USB_LGM_PHY
interface to interact with USB GEN-II and USB 3.x PHY that is part interface to interact with USB GEN-II and USB 3.x PHY that is part
of the Intel network SOC. of the Intel network SOC.
config PHY_CAN_TRANSCEIVER
tristate "CAN transceiver PHY"
select GENERIC_PHY
help
This option enables support for CAN transceivers as a PHY. This
driver provides function for putting the transceivers in various
functional modes using gpios and sets the attribute max link
rate, for CAN drivers.
source "drivers/phy/allwinner/Kconfig" source "drivers/phy/allwinner/Kconfig"
source "drivers/phy/amlogic/Kconfig" source "drivers/phy/amlogic/Kconfig"
source "drivers/phy/broadcom/Kconfig" source "drivers/phy/broadcom/Kconfig"

View File

@ -5,6 +5,7 @@
obj-$(CONFIG_GENERIC_PHY) += phy-core.o obj-$(CONFIG_GENERIC_PHY) += phy-core.o
obj-$(CONFIG_GENERIC_PHY_MIPI_DPHY) += phy-core-mipi-dphy.o obj-$(CONFIG_GENERIC_PHY_MIPI_DPHY) += phy-core-mipi-dphy.o
obj-$(CONFIG_PHY_CAN_TRANSCEIVER) += phy-can-transceiver.o
obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o
obj-$(CONFIG_PHY_XGENE) += phy-xgene.o obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o

View File

@ -0,0 +1,146 @@
// 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 <faiz_abbas@ti.com>");
MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>");
MODULE_DESCRIPTION("CAN TRANSCEIVER PHY driver");
MODULE_LICENSE("GPL v2");