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usb: misc: usb3503: support usb3803 and bypass mode

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Add support for USB3803 and bypass mode, with this change
is also possible to move the component out of bypass mode.

In bypass mode the downstream port 3 is connected to the
upstream port with low switch resistance R_on.

Controlling mode of operations:

| RESET_N | BYPASS_N | Mode    |
--------------------------------
|    0    |    0     | standby |
|    1    |    0     | bypass  |
|    1    |    1     | hub     |

Datasheet: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/00001691D.pdf
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20230313165039.255579-4-francesco@dolcini.it
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Emanuele Ghidoli 2023-03-13 17:50:39 +01:00 committed by Greg Kroah-Hartman
parent b04b32cd67
commit b91e610711
2 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/usb/misc/usb3503.c
View File

@ -46,6 +46,7 @@ struct usb3503 {
struct device *dev;
struct clk *clk;
u8 port_off_mask;
struct gpio_desc *bypass;
struct gpio_desc *intn;
struct gpio_desc *reset;
struct gpio_desc *connect;
@ -109,18 +110,25 @@ static int usb3503_connect(struct usb3503 *hub)
static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
{
struct device *dev = hub->dev;
int rst, conn;
int rst, bypass, conn;
switch (mode) {
case USB3503_MODE_HUB:
conn = 1;
rst = 0;
bypass = 0;
break;
case USB3503_MODE_STANDBY:
conn = 0;
rst = 1;
bypass = 1;
dev_info(dev, "switched to STANDBY mode\n");
break;
case USB3503_MODE_BYPASS:
conn = 0;
rst = 0;
bypass = 1;
break;
default:
dev_err(dev, "unknown mode is requested\n");
return -EINVAL;
@ -132,6 +140,9 @@ static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
if (hub->reset)
gpiod_set_value_cansleep(hub->reset, rst);
if (hub->bypass)
gpiod_set_value_cansleep(hub->bypass, bypass);
if (conn) {
/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
usleep_range(4000, 10000);
@ -247,6 +258,14 @@ static int usb3503_probe(struct usb3503 *hub)
if (hub->connect)
gpiod_set_consumer_name(hub->connect, "usb3503 connect");
hub->bypass = devm_gpiod_get_optional(dev, "bypass", GPIOD_OUT_HIGH);
if (IS_ERR(hub->bypass)) {
err = PTR_ERR(hub->bypass);
goto err_clk;
}
if (hub->bypass)
gpiod_set_consumer_name(hub->bypass, "usb3503 bypass");
hub->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(hub->reset)) {
err = PTR_ERR(hub->reset);
@ -382,6 +401,7 @@ MODULE_DEVICE_TABLE(i2c, usb3503_id);
static const struct of_device_id usb3503_of_match[] = {
{ .compatible = "smsc,usb3503", },
{ .compatible = "smsc,usb3503a", },
{ .compatible = "smsc,usb3803", },
{},
};
MODULE_DEVICE_TABLE(of, usb3503_of_match);

1
include/linux/platform_data/usb3503.h
View File

@ -12,6 +12,7 @@ enum usb3503_mode {
USB3503_MODE_UNKNOWN,
USB3503_MODE_HUB,
USB3503_MODE_STANDBY,
USB3503_MODE_BYPASS,
};
struct usb3503_platform_data {