leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

phy: phy-can-transceiver: Add support for setting mux

Browse Source 
On some boards, for routing CAN signals from controller to transceiver,
muxes might need to be set. Therefore, add support for setting the mux by
reading the mux-states property from the device tree node.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Link: https://lore.kernel.org/r/20220408111316.21189-1-a-govindraju@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Aswath Govindraju 2022-04-08 16:43:16 +05:30 committed by Vinod Koul
parent 3123109284
commit e4d4371253
2 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/phy/Kconfig
View File

@ -64,6 +64,7 @@ config USB_LGM_PHY
config PHY_CAN_TRANSCEIVER config PHY_CAN_TRANSCEIVER
tristate "CAN transceiver PHY" tristate "CAN transceiver PHY"
select GENERIC_PHY select GENERIC_PHY
select MULTIPLEXER
help help
This option enables support for CAN transceivers as a PHY. This This option enables support for CAN transceivers as a PHY. This
driver provides function for putting the transceivers in various driver provides function for putting the transceivers in various

22
drivers/phy/phy-can-transceiver.c
View File

@ -10,6 +10,7 @@
#include<linux/module.h> #include<linux/module.h>
#include<linux/gpio.h> #include<linux/gpio.h>
#include<linux/gpio/consumer.h> #include<linux/gpio/consumer.h>
#include <linux/mux/consumer.h>
struct can_transceiver_data { struct can_transceiver_data {
u32 flags; u32 flags;
@ -21,13 +22,22 @@ struct can_transceiver_phy {
struct phy *generic_phy; struct phy *generic_phy;
struct gpio_desc *standby_gpio; struct gpio_desc *standby_gpio;
struct gpio_desc *enable_gpio; struct gpio_desc *enable_gpio;
struct mux_state *mux_state;
}; };
/* Power on function */ /* Power on function */
static int can_transceiver_phy_power_on(struct phy *phy) static int can_transceiver_phy_power_on(struct phy *phy)
{ {
struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
int ret;
if (can_transceiver_phy->mux_state) {
ret = mux_state_select(can_transceiver_phy->mux_state);
if (ret) {
dev_err(&phy->dev, "Failed to select CAN mux: %d\n", ret);
return ret;
}
}
if (can_transceiver_phy->standby_gpio) if (can_transceiver_phy->standby_gpio)
gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0); gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0);
if (can_transceiver_phy->enable_gpio) if (can_transceiver_phy->enable_gpio)
@ -45,6 +55,8 @@ static int can_transceiver_phy_power_off(struct phy *phy)
gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1); gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
if (can_transceiver_phy->enable_gpio) if (can_transceiver_phy->enable_gpio)
gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0); gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
if (can_transceiver_phy->mux_state)
mux_state_deselect(can_transceiver_phy->mux_state);
return 0; return 0;
} }
@ -95,6 +107,16 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node); match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
drvdata = match->data; drvdata = match->data;
if (of_property_read_bool(dev->of_node, "mux-states")) {
struct mux_state *mux_state;
mux_state = devm_mux_state_get(dev, NULL);
if (IS_ERR(mux_state))
return dev_err_probe(&pdev->dev, PTR_ERR(mux_state),
"failed to get mux\n");
can_transceiver_phy->mux_state = mux_state;
}
phy = devm_phy_create(dev, dev->of_node, phy = devm_phy_create(dev, dev->of_node,
&can_transceiver_phy_ops); &can_transceiver_phy_ops);
if (IS_ERR(phy)) { if (IS_ERR(phy)) {