linux-kernel - [PATCH v2 3/6] usb: gadget: dummy_hcd: document ISO endpoint allocation pattern

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Message-ID: <20251201203715.17768-4-clintbgeorge@gmail.com>
Date: Tue,  2 Dec 2025 02:07:12 +0530
From: Clint George <clintbgeorge@...il.com>
To: stern@...land.harvard.edu,
	gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	david.hunter.linux@...il.com,
	linux-kernel-mentees@...ts.linux.dev,
	skhan@...uxfoundation.org,
	khalid@...nel.org,
	Clint George <clintbgeorge@...il.com>
Subject: [PATCH v2 3/6] usb: gadget: dummy_hcd: document ISO endpoint allocation pattern

Remove commented-out ISO definition and add relevant comment documenting
the ISO endpoint allocation pattern.
---
 drivers/usb/gadget/udc/dummy_hcd.c | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 39b571899..e4124838e 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -151,35 +151,23 @@ static const struct {
 	EP_INFO("ep2out-bulk",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 /*
-	EP_INFO("ep3in-iso",
-		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
-	EP_INFO("ep4out-iso",
-		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
-*/
+ *	If dummy-hcd supported isochronous transfers:
+ *	- Endpoints 3 and 4 would be ISO IN/OUT respectively
+ *	- Endpoints 8 and 9 would be ISO IN/OUT respectively
+ *	- Endpoints 13 and 14 would be ISO IN/OUT respectively
+ */
 	EP_INFO("ep5in-int",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 	EP_INFO("ep6in-bulk",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 	EP_INFO("ep7out-bulk",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
-/*
-	EP_INFO("ep8in-iso",
-		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
-	EP_INFO("ep9out-iso",
-		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
-*/
 	EP_INFO("ep10in-int",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 	EP_INFO("ep11in-bulk",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 	EP_INFO("ep12out-bulk",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
-/*
-	EP_INFO("ep13in-iso",
-		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
-	EP_INFO("ep14out-iso",
-		USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
-*/
 	EP_INFO("ep15in-int",
 		USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 
-- 
2.43.0