linux-kernel - [PATCH v8 4/5] usb: host: xhci-plat: Create platform device for onboard hubs in probe()

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Date:   Wed, 28 Apr 2021 11:41:31 -0700
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>
Cc:     linux-kernel@...r.kernel.org,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        Michal Simek <michal.simek@...inx.com>,
        Bastien Nocera <hadess@...ess.net>, linux-usb@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, devicetree@...r.kernel.org,
        Peter Chen <peter.chen@....com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>
Subject: [PATCH v8 4/5] usb: host: xhci-plat: Create platform device for onboard hubs in probe()

Check during probe() if a hub supported by the onboard_usb_hub
driver is connected to the controller. If such a hub is found
create the corresponding platform device. This requires the
device tree to have a node for the hub with its vendor and
product id (which is not common for USB devices). Further the
platform device is only created when CONFIG_USB_ONBOARD_HUB=y/m.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---

Changes in v8:
- none

Changes in v7:
- none

Changes in v6:
- none

Changes in v5:
- patch added to the series

 drivers/usb/host/xhci-plat.c | 16 ++++++++++++++++
 include/linux/usb/hcd.h      |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index c1edcc9b13ce..9c0fb7e8df1f 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -15,6 +15,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/usb/onboard_hub.h>
 #include <linux/usb/phy.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
@@ -195,6 +196,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	int			ret;
 	int			irq;
 	struct xhci_plat_priv	*priv = NULL;
+	struct device_node	*np;
 
 
 	if (usb_disabled())
@@ -374,6 +376,17 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	 */
 	pm_runtime_forbid(&pdev->dev);
 
+	np = usb_of_get_device_node(hcd->self.root_hub, hcd->self.busnum);
+	if (np && of_is_onboard_usb_hub(np)) {
+		struct platform_device *pdev;
+
+		pdev = of_platform_device_create(np, NULL, NULL);
+		if (pdev)
+			hcd->onboard_hub_dev = &pdev->dev;
+		else
+			xhci_warn(xhci, "failed to create onboard hub platform device\n");
+	}
+
 	return 0;
 
 
@@ -420,6 +433,9 @@ static int xhci_plat_remove(struct platform_device *dev)
 	usb_remove_hcd(hcd);
 	usb_put_hcd(shared_hcd);
 
+	if (hcd->onboard_hub_dev)
+		of_platform_device_destroy(hcd->onboard_hub_dev, NULL);
+
 	clk_disable_unprepare(clk);
 	clk_disable_unprepare(reg_clk);
 	usb_put_hcd(hcd);
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 96281cd50ff6..d02a508e19b0 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -225,6 +225,8 @@ struct usb_hcd {
 	 * (ohci 32, uhci 1024, ehci 256/512/1024).
 	 */
 
+	struct device *onboard_hub_dev;
+
 	/* The HC driver's private data is stored at the end of
 	 * this structure.
 	 */
-- 
2.31.1.498.g6c1eba8ee3d-goog