[v3,1/2] usb: typec: tps6598x: add reset gpio support
Commit Message
The TPS6598x PD controller provides an active-high hardware reset input
that reinitializes all device settings. If it is not grounded by
design, the driver must be able to de-assert it in order to initialize
the device.
The PD controller is not ready for registration right after the reset
de-assertion and a delay must be introduced in that case. According to
TI, the delay can reach up to 1000 ms [1], which is in line with the
experimental results obtained with a TPS65987D.
Add a GPIO descriptor for the reset signal and basic reset management
for initialization and suspend/resume.
[1] https://e2e.ti.com/support/power-management-group/power-management/
f/power-management-forum/1269856/tps65987d-tps65987d-reset-de-assert-
to-normal-operation/4809389#4809389
Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/usb/typec/tipd/core.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
@@ -8,6 +8,7 @@
#include <linux/i2c.h>
#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/power_supply.h>
@@ -64,6 +65,9 @@
#define TPS_PBMC_RC 0 /* Return code */
#define TPS_PBMC_DPCS 2 /* device patch complete status */
+/* reset de-assertion to ready for operation */
+#define TPS_SETUP_MS 1000
+
enum {
TPS_PORTINFO_SINK,
TPS_PORTINFO_SINK_ACCESSORY,
@@ -119,6 +123,7 @@ struct tps6598x {
struct mutex lock; /* device lock */
u8 i2c_protocol:1;
+ struct gpio_desc *reset;
struct typec_port *port;
struct typec_partner *partner;
struct usb_pd_identity partner_identity;
@@ -1190,6 +1195,13 @@ static int tps6598x_probe(struct i2c_client *client)
mutex_init(&tps->lock);
tps->dev = &client->dev;
+ tps->reset = devm_gpiod_get_optional(tps->dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(tps->reset))
+ return dev_err_probe(tps->dev, PTR_ERR(tps->reset),
+ "failed to get reset GPIO\n");
+ if (tps->reset)
+ msleep(TPS_SETUP_MS);
+
tps->regmap = devm_regmap_init_i2c(client, &tps6598x_regmap_config);
if (IS_ERR(tps->regmap))
return PTR_ERR(tps->regmap);
@@ -1344,6 +1356,9 @@ static void tps6598x_remove(struct i2c_client *client)
/* Reset PD controller to remove any applied patch */
if (device_is_compatible(tps->dev, "ti,tps25750"))
tps6598x_exec_cmd_tmo(tps, "GAID", 0, NULL, 0, NULL, 2000, 0);
+
+ if (tps->reset)
+ gpiod_set_value_cansleep(tps->reset, 1);
}
static int __maybe_unused tps6598x_suspend(struct device *dev)
@@ -1354,6 +1369,8 @@ static int __maybe_unused tps6598x_suspend(struct device *dev)
if (tps->wakeup) {
disable_irq(client->irq);
enable_irq_wake(client->irq);
+ } else if (tps->reset) {
+ gpiod_set_value_cansleep(tps->reset, 1);
}
if (!client->irq)
@@ -1381,6 +1398,9 @@ static int __maybe_unused tps6598x_resume(struct device *dev)
if (tps->wakeup) {
disable_irq_wake(client->irq);
enable_irq(client->irq);
+ } else if (tps->reset) {
+ gpiod_set_value_cansleep(tps->reset, 0);
+ msleep(TPS_SETUP_MS);
}
if (!client->irq)