usb: usb251xb: add boost-up property support

Add support for boost-up register of usb251xb hub.
boost-up property control USB electrical drive strength
This register can be set:

 - Normal mode -> 0x00
 - Low         -> 0x01
 - Medium      -> 0x10
 - High        -> 0x11

(Normal Default)

References:
 - http://www.mouser.com/catalog/specsheets/2514.pdf p29

Reviewed-by: Richard Leitner <richard.leitner@linux.dev>
Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Link: https://lore.kernel.org/r/20220128181713.96856-1-tomm.merciai@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 507deef..04c4e3f 100644 (file)
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -543,6 +543,9 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
        if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
                hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
 
+       if (of_property_read_u8(np, "boost-up", &hub->boost_up))
+               hub->boost_up = USB251XB_DEF_BOOST_UP;
+
        cproperty_char = of_get_property(np, "manufacturer", NULL);
        strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
                sizeof(str));
@@ -584,7 +587,6 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
         * may be as soon as needed.
         */
        hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
-       hub->boost_up = USB251XB_DEF_BOOST_UP;
        hub->boost_57 = USB251XB_DEF_BOOST_57;
        hub->boost_14 = USB251XB_DEF_BOOST_14;
        hub->port_map12 = USB251XB_DEF_PORT_MAP_12;