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usb: usb251xb: add vdd supply support

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Currently we don't handle the supply. We need to add the supply support
to be able to switch the supply off e.g. during a suspend-to-ram
operation. So we can guarantee a correct (re-)initialization.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Richard Leitner <richard.leitner@skidata.com>
Tested-by: Richard Leitner <richard.leitner@skidata.com>
Link: https://lore.kernel.org/r/20190917144449.32739-3-m.felsch@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marco Felsch 2019-09-17 16:44:47 +02:00 committed by Greg Kroah-Hartman
parent ad9480ae36
commit 4d7201cda2
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/misc/usb251xb.c
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@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
/* Internal Register Set Addresses & Default Values acc. to DS00001692C */
@ -116,6 +117,7 @@
struct usb251xb {
struct device *dev;
struct i2c_client *i2c;
struct regulator *vdd;
u8 skip_config;
struct gpio_desc *gpio_reset;
u16 vendor_id;
@ -420,6 +422,10 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
return err;
}
hub->vdd = devm_regulator_get(dev, "vdd");
if (IS_ERR(hub->vdd))
return PTR_ERR(hub->vdd);
if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
hub->vendor_id = USB251XB_DEF_VENDOR_ID;
@ -665,6 +671,10 @@ static int usb251xb_probe(struct usb251xb *hub)
if (err)
return err;
err = regulator_enable(hub->vdd);
if (err)
return err;
err = usb251xb_connect(hub);
if (err) {
dev_err(dev, "Failed to connect hub (%d)\n", err);