usb: usb251xb: add vdd supply support

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>

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 6ca9111d150a34b5fe567cc77e07c2c95c2b470e..05819167604d70efb1159d2d67513b9dd4c751cc 100644 (file)
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -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);