usb: isp1760: use dr_mode binding

There is already a binding to describe the dual role mode (dr_mode),
use that instead of defining a new one (port1-otg).

Update driver code and devicetree files that use that port1-otg
binding.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Link: https://lore.kernel.org/r/20210513084717.2487366-7-rui.silva@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm/boot/dts/arm-realview-eb.dtsi

@@ -148,7 +148,7 @@ ethernet: ethernet@4e000000 {
 	usb: usb@4f000000 {
 		compatible = "nxp,usb-isp1761";
 		reg = <0x4f000000 0x20000>;
-		port1-otg;
+		dr_mode = "peripheral";
 	};
 
 	bridge {

arch/arm/boot/dts/arm-realview-pb1176.dts

@@ -166,7 +166,7 @@ usb@3b000000 {
 		reg = <0x3b000000 0x20000>;
 		interrupt-parent = <&intc_fpga1176>;
 		interrupts = <0 11 IRQ_TYPE_LEVEL_HIGH>;
-		port1-otg;
+		dr_mode = "peripheral";
 	};
 
 	bridge {

arch/arm/boot/dts/arm-realview-pb11mp.dts

@@ -712,7 +712,7 @@ usb@4f000000 {
 			reg = <0x4f000000 0x20000>;
 			interrupt-parent = <&intc_tc11mp>;
 			interrupts = <0 3 IRQ_TYPE_LEVEL_HIGH>;
-			port1-otg;
+			dr_mode = "peripheral";
 		};
 	};
 };

arch/arm/boot/dts/arm-realview-pbx.dtsi

@@ -164,7 +164,7 @@ ethernet: ethernet@4e000000 {
 	usb: usb@4f000000 {
 		compatible = "nxp,usb-isp1761";
 		reg = <0x4f000000 0x20000>;
-		port1-otg;
+		dr_mode = "peripheral";
 	};
 
 	bridge {

arch/arm/boot/dts/vexpress-v2m-rs1.dtsi

@@ -144,7 +144,7 @@ usb@203000000 {
 				compatible = "nxp,usb-isp1761";
 				reg = <2 0x03000000 0x20000>;
 				interrupts = <16>;
-				port1-otg;
+				dr_mode = "peripheral";
 			};
 
 			iofpga-bus@300000000 {

arch/arm/boot/dts/vexpress-v2m.dtsi

@@ -62,7 +62,7 @@ usb@3,03000000 {
 				compatible = "nxp,usb-isp1761";
 				reg = <3 0x03000000 0x20000>;
 				interrupts = <16>;
-				port1-otg;
+				dr_mode = "peripheral";
 			};
 
 			iofpga@7,00000000 {

drivers/usb/isp1760/isp1760-core.c

@@ -73,10 +73,9 @@ static void isp1760_init_core(struct isp1760_device *isp)
 	 * on ISP1761.
 	 *
 	 * TODO: Really support OTG. For now we configure port 1 in device mode
-	 * when OTG is requested.
 	 */
 	if ((isp->devflags & ISP1760_FLAG_ISP1761) &&
-	    (isp->devflags & ISP1760_FLAG_OTG_EN)) {
+	    (isp->devflags & ISP1760_FLAG_PERIPHERAL_EN)) {
 		isp1760_field_set(hcd->fields, HW_DM_PULLDOWN);
 		isp1760_field_set(hcd->fields, HW_DP_PULLDOWN);
 		isp1760_field_set(hcd->fields, HW_OTG_DISABLE);

drivers/usb/isp1760/isp1760-core.h

@@ -28,7 +28,7 @@ struct gpio_desc;
  * a sane default configuration.
  */
 #define ISP1760_FLAG_BUS_WIDTH_16	0x00000002 /* 16-bit data bus width */
-#define ISP1760_FLAG_OTG_EN		0x00000004 /* Port 1 supports OTG */
+#define ISP1760_FLAG_PERIPHERAL_EN	0x00000004 /* Port 1 supports Peripheral mode*/
 #define ISP1760_FLAG_ANALOG_OC		0x00000008 /* Analog overcurrent */
 #define ISP1760_FLAG_DACK_POL_HIGH	0x00000010 /* DACK active high */
 #define ISP1760_FLAG_DREQ_POL_HIGH	0x00000020 /* DREQ active high */

drivers/usb/isp1760/isp1760-if.c

@@ -17,6 +17,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/usb/hcd.h>
+#include <linux/usb/otg.h>
 
 #include "isp1760-core.h"
 #include "isp1760-regs.h"
@@ -213,8 +214,8 @@ static int isp1760_plat_probe(struct platform_device *pdev)
 		if (bus_width == 16)
 			devflags |= ISP1760_FLAG_BUS_WIDTH_16;
 
-		if (of_property_read_bool(dp, "port1-otg"))
-			devflags |= ISP1760_FLAG_OTG_EN;
+		if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL)
+			devflags |= ISP1760_FLAG_PERIPHERAL_EN;
 
 		if (of_property_read_bool(dp, "analog-oc"))
 			devflags |= ISP1760_FLAG_ANALOG_OC;