[PATCH 1/4] usb: host: xhci-rcar: add xhci_rcar_is_compatible() function

[Yoshihiro Shimoda]

To add support for other SoCs in the future, this patch adds
xhci_rcar_is_compatible() to check the compatible string.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
 drivers/usb/host/xhci-plat.c |  9 ++-------
 drivers/usb/host/xhci-rcar.c | 12 ++++++++++++
 drivers/usb/host/xhci-rcar.h |  6 ++++++
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 890ad9d..26acece 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -48,11 +48,9 @@ static void xhci_plat_quirks(struct device *dev, struct 
xhci_hcd *xhci)
 /* called during probe() after chip reset completes */
 static int xhci_plat_setup(struct usb_hcd *hcd)
 {
-       struct device_node *of_node = hcd->self.controller->of_node;
        int ret;
 
-       if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
-           of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
+       if (xhci_rcar_is_compatible(hcd)) {
                ret = xhci_rcar_init_quirk(hcd);
                if (ret)
                        return ret;
@@ -63,10 +61,7 @@ static int xhci_plat_setup(struct usb_hcd *hcd)
 
 static int xhci_plat_start(struct usb_hcd *hcd)
 {
-       struct device_node *of_node = hcd->self.controller->of_node;
-
-       if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
-           of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
+       if (xhci_rcar_is_compatible(hcd))
                xhci_rcar_start(hcd);
 
        return xhci_run(hcd);
diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index ff0d1b4..642fe55 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -10,6 +10,7 @@
 
 #include <linux/firmware.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/usb/phy.h>
 
@@ -56,6 +57,17 @@ MODULE_FIRMWARE(FIRMWARE_NAME);
 #define RCAR_USB3_RX_POL_VAL   BIT(21)
 #define RCAR_USB3_TX_POL_VAL   BIT(4)
 
+bool xhci_rcar_is_compatible(struct usb_hcd *hcd)
+{
+       struct device_node *of_node = hcd->self.controller->of_node;
+
+       if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
+           of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
+               return true;
+
+       return false;
+}
+
 void xhci_rcar_start(struct usb_hcd *hcd)
 {
        u32 temp;
diff --git a/drivers/usb/host/xhci-rcar.h b/drivers/usb/host/xhci-rcar.h
index 5850125..0eb67fa 100644
--- a/drivers/usb/host/xhci-rcar.h
+++ b/drivers/usb/host/xhci-rcar.h
@@ -12,9 +12,15 @@
 #define _XHCI_RCAR_H
 
 #if IS_ENABLED(CONFIG_USB_XHCI_RCAR)
+bool xhci_rcar_is_compatible(struct usb_hcd *);
 void xhci_rcar_start(struct usb_hcd *hcd);
 int xhci_rcar_init_quirk(struct usb_hcd *hcd);
 #else
+static inline bool xhci_rcar_is_compatible(struct usb_hcd *hcd)
+{
+       return false;
+}
+
 static inline void xhci_rcar_start(struct usb_hcd *hcd)
 {
 }
-- 
1.9.1

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