This enables the platform-roothub for the xhci-plat driver. This allows
specifying a PHY for each port via devicetree. All PHYs will then be
enabled/disabled by the platform-roothub driver.
One example where this is required is the Amlogic GXL and GXM SoCs:
They are using a dwc3 USB controller with up to three ports enabled on
the internal roothub. Using only the top-level "phy" properties does not
work here since one can only specify one "usb2-phy" and one "usb3-phy",
while actually at least two "usb2-phy" have to be specified.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/usb/usb-xhci.txt | 7 ++++++
drivers/usb/host/Kconfig | 1 +
drivers/usb/host/xhci-plat.c | 27 +++++++++++++++++++++-
drivers/usb/host/xhci.h | 2 ++
4 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index 2d80b60eeabe..31b4f681e9ca 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -29,6 +29,13 @@ Optional properties:
- usb3-lpm-capable: determines if platform is USB3 LPM capable
- quirk-broken-port-ped: set if the controller has broken port disable mechanism
+sub-nodes:
+- optionally there can be a node for the root-hub, see usb-roothub.txt in the
+ current directory
+- one or more nodes with reg 1-31 for each port to which a device is connected.
+ See usb-device.txt in the current directory for more information.
+
+
Example:
usb@f0931000 {
compatible = "generic-xhci";
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index b8b05c786b2a..3bdc49e89c0f 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -36,6 +36,7 @@ config USB_XHCI_PCI
config USB_XHCI_PLATFORM
tristate "Generic xHCI driver for a platform device"
select USB_XHCI_RCAR if ARCH_RENESAS
+ select USB_PLATFORM_ROOTHUB
---help---
Adds an xHCI host driver for a generic platform device, which
provides a memory space and an irq.
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index c04144b25a67..6fa27393e241 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <linux/acpi.h>
+#include "platform-roothub.h"
#include "xhci.h"
#include "xhci-plat.h"
#include "xhci-mvebu.h"
@@ -285,10 +286,20 @@ static int xhci_plat_probe(struct platform_device *pdev)
goto put_usb3_hcd;
}
- ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ xhci->platform_roothub = platform_roothub_init(sysdev);
+ if (IS_ERR(xhci->platform_roothub)) {
+ ret = PTR_ERR(xhci->platform_roothub);
+ goto disable_usb_phy;
+ }
+
+ ret = platform_roothub_power_on(xhci->platform_roothub);
if (ret)
goto disable_usb_phy;
+ ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (ret)
+ goto disable_plat_roothub;
+
if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
xhci->shared_hcd->can_do_streams = 1;
@@ -311,6 +322,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
dealloc_usb2_hcd:
usb_remove_hcd(hcd);
+disable_plat_roothub:
+ platform_roothub_power_off(xhci->platform_roothub);
+
disable_usb_phy:
usb_phy_shutdown(hcd->usb_phy);
@@ -342,6 +356,8 @@ static int xhci_plat_remove(struct platform_device *dev)
usb_remove_hcd(xhci->shared_hcd);
usb_phy_shutdown(hcd->usb_phy);
+ platform_roothub_power_off(xhci->platform_roothub);
+
usb_remove_hcd(hcd);
usb_put_hcd(xhci->shared_hcd);
@@ -374,6 +390,11 @@ static int __maybe_unused xhci_plat_suspend(struct device *dev)
if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk))
clk_disable_unprepare(xhci->clk);
+ if (ret)
+ return ret;
+
+ platform_roothub_power_off(xhci->platform_roothub);
+
return ret;
}
@@ -386,6 +407,10 @@ static int __maybe_unused xhci_plat_resume(struct device *dev)
if (!device_may_wakeup(dev) && !IS_ERR(xhci->clk))
clk_prepare_enable(xhci->clk);
+ ret = platform_roothub_power_on(xhci->platform_roothub);
+ if (ret)
+ return ret;
+
ret = xhci_priv_resume_quirk(hcd);
if (ret)
return ret;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 3c6da1f93c84..1079ac1dc596 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1725,6 +1725,8 @@ struct xhci_hcd {
int msix_count;
/* optional clock */
struct clk *clk;
+ /* optional platform root-hub */
+ struct platform_roothub *platform_roothub;
/* data structures */
struct xhci_device_context_array *dcbaa;
struct xhci_ring *cmd_ring;
--
2.13.2
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