usb: ChipIdea: add Nuvoton NPCM UDC support

This patch set add USB device controller for the NPCM Baseboard Management Controllers (BMC).

NPCM UDC driver is a part of the USB ChipIdea driver.

Adding CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag to modify the vbus_active parameter to active in case the ChipIdea USB IP role is device-only and there is no otgsc register.

BMC NPCM7XX and BMC NPCM8XX has ten identical NPCM UDC modules,

The NPCM UDC were tested on NPCM845 evaluation board.

Addressed comments from:
- Paul Menzel : https://www.spinics.net/lists/linux-usb/msg248033.html

Changes since version 6:
- Modify commit message.
- Modify debug event message.

Changes since version 5:
- Remove unnecessary npcm845-udc compatible.

Changes since version 4:
- Modify npcm845-udc compatible.

Changes since version 3:
- Add Acked-by Peter Chen.

Changes since version 2:
- Use dev_err_probe.
- Remove MODULE_ALIAS.

Changes since version 1:
- Add SoC specific compatible.
- Remove USB phy mux property from dt-binding, will be handled differently.
- Add CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS commit to this patch set.

Tomer Maimon (3):
usb: chipidea: add CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag
dt-bindings: usb: ci-hdrc-usb2: add npcm750 and npcm845 compatible
usb: chipidea: Add support for NPCM

 .../devicetree/bindings/usb/ci-hdrc-usb2.yaml |   6 +
 drivers/usb/chipidea/Kconfig                  |   4 +
 drivers/usb/chipidea/Makefile                 |   1 +
 drivers/usb/chipidea/ci_hdrc_npcm.c           | 114 ++++++++++++++++++
 drivers/usb/chipidea/otg.c                    |   5 +-
 include/linux/usb/chipidea.h                  |   1 +
 6 files changed, 130 insertions(+), 1 deletion(-)
 create mode 100644 drivers/usb/chipidea/ci_hdrc_npcm.c

2.33.0

Adding CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag to modify the vbus_active parameter to active in case the ChipIdea USB IP role is device-only and there is no otgsc register.

---
 drivers/usb/chipidea/otg.c   | 5 ++++-
 include/linux/usb/chipidea.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

index f5490f2a5b6b..647e98f4e351 100644
@@ -130,8 +130,11 @@ enum ci_role ci_otg_role(struct ci_hdrc *ci)
 
 void ci_handle_vbus_change(struct ci_hdrc *ci)
 {
-	if (!ci->is_otg)
+	if (!ci->is_otg) {
+		if (ci->platdata->flags & CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS)
+			usb_gadget_vbus_connect(&ci->gadget);
 		return;
+	}
 
 	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active)
 		usb_gadget_vbus_connect(&ci->gadget);

index 0b4f2d5faa08..5a7f96684ea2 100644
@@ -64,6 +64,7 @@ struct ci_hdrc_platform_data {
 #define CI_HDRC_PMQOS			BIT(15)
 #define CI_HDRC_PHY_VBUS_CONTROL	BIT(16)
 #define CI_HDRC_HAS_PORTSC_PEC_MISSED	BIT(17)
+#define CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS	BIT(18)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1

2.33.0

Add a compatible string for Nuvoton BMC NPCM750 and Nuvoton BMC NPCM845.

---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

index 1394557517b1..f5ec1aef839e 100644
@@ -16,6 +16,7 @@ properties:
       - enum:
           - chipidea,usb2
           - lsi,zevio-usb
+          - nuvoton,npcm750-udc
           - nvidia,tegra20-ehci
           - nvidia,tegra20-udc
           - nvidia,tegra30-ehci

@@ -66,6 +67,10 @@ properties:
       - items:
           - const: xlnx,zynq-usb-2.20a
           - const: chipidea,usb2
+      - items:
+          - enum:
+              - nuvoton,npcm845-udc
+          - const: nuvoton,npcm750-udc
 
   reg:
     minItems: 1

@@ -388,6 +393,7 @@ allOf:
             enum:
               - chipidea,usb2
               - lsi,zevio-usb
+              - nuvoton,npcm750-udc
               - nvidia,tegra20-udc
               - nvidia,tegra30-udc
               - nvidia,tegra114-udc

2.33.0

Best regards,
Krzysztof

Add Nuvoton NPCM BMC SoCs support to USB ChipIdea driver.
NPCM SoC includes ChipIdea IP block that is used for USB device controller mode.

---
 drivers/usb/chipidea/Kconfig        |   4 +
 drivers/usb/chipidea/Makefile       |   1 +
 drivers/usb/chipidea/ci_hdrc_npcm.c | 114 ++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 drivers/usb/chipidea/ci_hdrc_npcm.c

index c815824a0b2d..bab45bc62361 100644
@@ -43,6 +43,10 @@ config USB_CHIPIDEA_MSM
 	tristate "Enable MSM hsusb glue driver" if EXPERT
 	default USB_CHIPIDEA
 
+config USB_CHIPIDEA_NPCM
+	tristate "Enable NPCM hsusb glue driver" if EXPERT
+	default USB_CHIPIDEA
+
 config USB_CHIPIDEA_IMX
 	tristate "Enable i.MX USB glue driver" if EXPERT
 	depends on OF

index 71afeab97e83..718cb24603dd 100644
@@ -13,6 +13,7 @@ ci_hdrc-$(CONFIG_USB_OTG_FSM)		+= otg_fsm.o
 
 obj-$(CONFIG_USB_CHIPIDEA_GENERIC)	+= ci_hdrc_usb2.o
 obj-$(CONFIG_USB_CHIPIDEA_MSM)		+= ci_hdrc_msm.o
+obj-$(CONFIG_USB_CHIPIDEA_NPCM)		+= ci_hdrc_npcm.o
 obj-$(CONFIG_USB_CHIPIDEA_PCI)		+= ci_hdrc_pci.o
 obj-$(CONFIG_USB_CHIPIDEA_IMX)		+= usbmisc_imx.o ci_hdrc_imx.o
 obj-$(CONFIG_USB_CHIPIDEA_TEGRA)	+= ci_hdrc_tegra.o

2.33.0