[PATCH v20 4/5] usb: core: hcd: Create platform devices for onboard hubs in probe()

Matthias Kaehlcke
2022-01-19T20:44:42Z

Call onboard_hub_create/destroy_pdevs() from usb_add/remove_hcd()
for primary HCDs to create/destroy platform devices for onboard
USB hubs that may be connected to the root hub of the controller.
These functions are a NOP unless CONFIG_USB_ONBOARD_HUB=y/m.

Also add a field to struct usb_hcd to keep track of the onboard hub
platform devices that are owned by the HCD.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---

Changes in v20:
- added 'Reviewed-by' tags from Doug and Stephen

Changes in v19:
- none

Changes in v18:
- none

Changes in v17:
- create the platform devices in the generic HCD code instead of
the xhci_platform driver
- updated subject and commit message to reflect the above change
- dropped initialization of platform device list, which is now
done in onboard_hub_create_pdevs()

Changes in v16:
- none

Changes in v15:
- none

Changes in v14:
- none

Changes in v13:
- added comment for 'depends on USB_ONBOARD_HUB || !USB_ONBOARD_HUB'
construct

Changes in v12:
- none

Changes in v11:
- use onboard_hub_create/destroy_pdevs() to support multiple onboard
hubs that are connected to the same root hub
- moved field/list to keep track of platform devices from struct
usb_hcd to struct xhci_hcd
- updated commit message

Changes in v10:
- none

Changes in v9:
- added dependency on USB_ONBOARD_HUB (or !!USB_ONBOARD_HUB) to
USB_XHCI_PLATFORM

Changes in v8:
- none

Changes in v7:
- none

Changes in v6:
- none

Changes in v5:
- patch added to the series

drivers/usb/core/hcd.c | 6 ++++++
include/linux/usb/hcd.h | 1 +
2 files changed, 7 insertions(+)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 4d326ee12c36..b8220e411e07 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -36,6 +36,7 @@
#include <linux/phy/phy.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
+#include <linux/usb/onboard_hub.h>
#include <linux/usb/otg.h>

#include "usb.h"
@@ -2963,6 +2964,9 @@ int usb_add_hcd(struct usb_hcd *hcd,
if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
usb_hcd_poll_rh_status(hcd);

+ if (usb_hcd_is_primary_hcd(hcd))
+ onboard_hub_create_pdevs(hcd->self.root_hub, &hcd->onboard_hub_devs);
+
return retval;

err_register_root_hub:
@@ -3041,6 +3045,8 @@ void usb_remove_hcd(struct usb_hcd *hcd)
if (usb_hcd_is_primary_hcd(hcd)) {
if (hcd->irq > 0)
free_irq(hcd->irq, hcd);
+
+ onboard_hub_destroy_pdevs(&hcd->onboard_hub_devs);
}

usb_deregister_bus(&hcd->self);
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 548a028f2dab..4ebc91c09182 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -198,6 +198,7 @@ struct usb_hcd {
struct usb_hcd *shared_hcd;
struct usb_hcd *primary_hcd;

+ struct list_head onboard_hub_devs;

#define HCD_BUFFER_POOLS 4
struct dma_pool *pool[HCD_BUFFER_POOLS];
--
2.34.1.703.g22d0c6ccf7-goog