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

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Date:   Wed, 19 Jan 2022 12:43:44 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>
Cc:     devicetree@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Peter Chen <peter.chen@...nel.org>,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Roger Quadros <rogerq@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        linux-usb@...r.kernel.org, Bastien Nocera <hadess@...ess.net>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Li Jun <jun.li@....com>, Peter Chen <peter.chen@....com>,
        Sasha Levin <sashal@...nel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Subject: [PATCH v20 4/5] usb: core: hcd: Create platform devices for onboard hubs in probe()

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@...omium.org>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.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