The host controller by itself may sometimes need to handle PHY
and/or calibrate some of the PHY settings to get full support out
of the PHY controller. The PHY core provides a calibration
funtionality now to do so.
Therefore, facilitate getting the two possible PHYs, viz.
USB 2.0 type (UTMI+) and USB 3.0 type (PIPE3), provided
by the parent - Synopsys's DWC3 controller
Signed-off-by: Vivek Gautam <gautam.vi...@samsung.com>
---
drivers/usb/host/xhci-plat.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 29d8adb..e50bd7d 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
#include <linux/slab.h>
#include "xhci.h"
@@ -101,6 +102,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
struct clk *clk;
int ret;
int irq;
+ struct device *parent;
if (usb_disabled())
return -ENODEV;
@@ -165,6 +167,23 @@ static int xhci_plat_probe(struct platform_device *pdev)
goto unmap_registers;
}
+ parent = pdev->dev.parent;
+ /*
+ * Get possile USB 2.0 type PHY (UTMI+) registered by xhci's parent:
+ * Synopsys-dwc3
+ */
+ if (of_device_is_compatible(parent->of_node, "synopsys,dwc3") ||
+ of_device_is_compatible(parent->of_node, "snps,dwc3")) {
+ hcd->gen_phy = devm_phy_get(&pdev->dev, "usb2-phy");
+ if (IS_ERR(hcd->gen_phy)) {
+ ret = PTR_ERR(hcd->gen_phy);
+ if (ret != -ENOSYS && ret != -ENODEV) {
+ dev_err(&pdev->dev, "no usb2 phy configured\n");
+ return ret;
+ }
+ }
+ }
+
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret)
goto disable_clk;
@@ -191,6 +210,23 @@ static int xhci_plat_probe(struct platform_device *pdev)
if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
xhci->shared_hcd->can_do_streams = 1;
+ /*
+ * Get possile USB 3.0 type PHY (PIPE3) registered by xhci's parent:
+ * Synopsys-dwc3
+ */
+ if (of_device_is_compatible(parent->of_node, "synopsys,dwc3") ||
+ of_device_is_compatible(parent->of_node, "snps,dwc3")) {
+ xhci->shared_hcd->gen_phy = devm_phy_get(&pdev->dev,
+ "usb3-phy");
+ if (IS_ERR(xhci->shared_hcd->gen_phy)) {
+ ret = PTR_ERR(xhci->shared_hcd->gen_phy);
+ if (ret != -ENOSYS && ret != -ENODEV) {
+ dev_err(&pdev->dev, "no usb3 phy configured\n");
+ return ret;
+ }
+ }
+ }
+
ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
if (ret)
goto put_usb3_hcd;
--
1.7.10.4
--
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