[U-Boot] [PATCH v2 4/7] mvebu: usb: xhci: Add support for VBUS controlled by GPIO

[kostap at marvell.com]

From: Konstantin Porotchkin <kostap at marvell.com>

Add support for "marvell,vbus-gpio" property to mvebu XHCI
host adapter driver.
This option is valid when CONFIG_DM_GPIO=y

Change-Id: I930b3ebe001e50ae8d5abe1f3c774bcdb1739e64
Signed-off-by: Konstantin Porotchkin <kostap at marvell.com>
Cc: Stefan Roese <sr at denx.de>
Cc: Nadav Haklai <nadavh at marvell.com>
Cc: Neta Zur Hershkovits <neta at marvell.com>
Cc: Omri Itach <omrii at marvell.com>
Cc: Igal Liberman <igall at marvell.com>
Cc: Haim Boot <hayim at marvell.com>
Cc: Hanna Hawa <hannah at marvell.com>
---
Changes for v2:
- Move VBUS GPIO support from board-specific function to mvebu XHCI driver
- Increase delay after VBUS GPIO activation

 doc/device-tree-bindings/usb/marvell.xhci-usb.txt | 29 +++++++++++++++++++++++
 drivers/usb/host/xhci-mvebu.c                     | 14 +++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 doc/device-tree-bindings/usb/marvell.xhci-usb.txt

diff --git a/doc/device-tree-bindings/usb/marvell.xhci-usb.txt b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
new file mode 100644
index 0000000..b0a53ad
--- /dev/null
+++ b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
@@ -0,0 +1,29 @@
+Marvell SOC USB controllers
+
+This controller is integrated in Armada 3700/8K.
+It uses the same properties as a generic XHCI host controller
+
+Required properties :
+ - compatible: should be one or more of:
+   - "marvell,armada3700-xhci", "generic-xhci" for Armada 37xx SoCs
+   - "marvell,armada-8k-xhci", "generic-xhci" for Armada A8K SoCs
+ - reg: should contain address and length of the standard XHCI
+    register set for the device.
+ - interrupts: one XHCI interrupt should be described here.
+
+Optional properties:
+ - clocks: reference to a clock
+ - marvell,vbus-gpio : If present, specifies a gpio that needs to be
+   activated for the bus to be powered.
+
+Example:
+	cpm_usb3_0: usb3 at 500000 {
+		compatible = "marvell,armada-8k-xhci",
+			     "generic-xhci";
+		reg = <0x500000 0x4000>;
+		interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cpm_syscon0 1 22>;
+		marvell,vbus-gpio = <&cpm_gpio1 15 GPIO_ACTIVE_HIGH>;
+		status = "disabled";
+	};
+
diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
index 46eb937..64801e7 100644
--- a/drivers/usb/host/xhci-mvebu.c
+++ b/drivers/usb/host/xhci-mvebu.c
@@ -45,6 +45,20 @@ static int xhci_usb_probe(struct udevice *dev)
 	struct mvebu_xhci *ctx = dev_get_priv(dev);
 	struct xhci_hcor *hcor;
 	int len;
+#ifdef CONFIG_DM_GPIO
+	struct gpio_desc vbus_gpio;
+
+	gpio_request_by_name(dev, "marvell,vbus-gpio", 0, &vbus_gpio,
+			     GPIOD_IS_OUT);
+
+	if (dm_gpio_is_valid(&vbus_gpio)) {
+		dm_gpio_set_value(&vbus_gpio, 1);
+		/* Wait for the GPIO VBUS output set */
+		mdelay(500);
+	}
+#else
+	debug("USB VBUS on GPIO support is missing\n");
+#endif /* CONFIG_DM_GPIO */
 
 	ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
 	len = HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase));
-- 
2.7.4