[PATCH] usb: dwc2: handle return code of dev_read_size() in of to plat function

[Wolfgang Grandegger]

dev_read_size() returns -EINVAL (-22) if the property does not exist.

Signed-off-by: Wolfgang Grandegger <wg at aries-embedded.de>
---
 drivers/usb/gadget/dwc2_udc_otg.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
index 2748270..00f7e8e 100644
--- a/drivers/usb/gadget/dwc2_udc_otg.c
+++ b/drivers/usb/gadget/dwc2_udc_otg.c
@@ -996,8 +996,9 @@ static int dwc2_udc_otg_of_to_plat(struct udevice *dev)
 	plat->rx_fifo_sz = dev_read_u32_default(dev, "g-rx-fifo-size", 0);
 	plat->np_tx_fifo_sz = dev_read_u32_default(dev, "g-np-tx-fifo-size", 0);
 
-	plat->tx_fifo_sz_nb =
-		dev_read_size(dev, "g-tx-fifo-size") / sizeof(u32);
+	ret = dev_read_size(dev, "g-tx-fifo-size");
+	if (ret > 0)
+		platdata->tx_fifo_sz_nb = ret / sizeof(u32);
 	if (plat->tx_fifo_sz_nb > DWC2_MAX_HW_ENDPOINTS)
 		plat->tx_fifo_sz_nb = DWC2_MAX_HW_ENDPOINTS;
 	if (plat->tx_fifo_sz_nb) {
@@ -1052,7 +1053,6 @@ static int dwc2_udc_otg_reset_init(struct udevice *dev,
 		return ret;
 
 	ret = reset_assert_bulk(resets);
-
 	if (!ret) {
 		udelay(2);
 		ret = reset_deassert_bulk(resets);
-- 
1.9.1