Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
Cc: linux-usb@xxxxxxxxxxxxxxx
Acked-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
v2:
use devm_kzalloc
Best Regards,
J.
.../devicetree/bindings/usb/atmel-usb.txt | 19 ++++
drivers/usb/host/ohci-at91.c | 101 +++++++++++++++++++-
2 files changed, 119 insertions(+), 1 deletions(-)
create mode 100644 Documentation/devicetree/bindings/usb/atmel-usb.txt
diff --git a/Documentation/devicetree/bindings/usb/atmel-usb.txt b/Documentation/devicetree/bindings/usb/atmel-usb.txt
new file mode 100644
index 0000000..6c7f728
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt
@@ -0,0 +1,19 @@
+Atmel SOC USB controllers
+
+OHCI
+
+Required properties:
+ - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers
+ used in host mode.
+ - num-ports: Number of ports.
+ - atmel,vbus-gpio: If present, specifies a gpio that needs to be
+ activated for the bus to be powered.
+ - atmel,oc-gpio: If present, specifies a gpio that needs to be
+ activated for the overcurrent detection.
+
+usb0: ohci@00500000 {
+ compatible = "atmel,at91rm9200-ohci", "usb-ohci";
+ reg = <0x00500000 0x100000>;
+ interrupts = <20 4>;
+ num-ports = <2>;
+};
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 8e855eb..db8963f 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -14,6 +14,8 @@
#include <linux/clk.h>
#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
#include <mach/hardware.h>
#include <asm/gpio.h>
@@ -477,13 +479,109 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
return IRQ_HANDLED;
}
+#ifdef CONFIG_OF
+static const struct of_device_id at91_ohci_dt_ids[] = {
+ { .compatible = "atmel,at91rm9200-ohci" },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
+
+static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
+
+static int __devinit ohci_at91_of_init(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int i, ret, gpio;
+ enum of_gpio_flags flags;
+ struct at91_usbh_data *pdata;
+ u32 ports;
+
+ if (!np)
+ return 0;
+
+ /* Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we have dma capability bindings this can go away.
+ */
+ if (!pdev->dev.dma_mask)
+ pdev->dev.dma_mask = &at91_ohci_dma_mask;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ if (!of_property_read_u32(np, "num-ports", &ports))
+ pdata->ports = ports;
+
+ for (i = 0; i < 2; i++) {
+ gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
+ pdata->vbus_pin[i] = gpio;
+ if (!gpio_is_valid(gpio))
+ continue;
+ pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
+ ret = gpio_request(gpio, "ohci_vbus");
+ if (ret) {
+ dev_warn(&pdev->dev, "can't request vbus gpio %d", gpio);
+ continue;
+ }
+ ret = gpio_direction_output(gpio, !(flags & OF_GPIO_ACTIVE_LOW) ^ 1);
+ if (ret)
+ dev_warn(&pdev->dev, "can't put vbus gpio %d as output %d",
+ !(flags & OF_GPIO_ACTIVE_LOW) ^ 1, gpio);
+ }
+
+ for (i = 0; i < 2; i++) {
+ gpio = of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
+ pdata->overcurrent_pin[i] = gpio;
+ if (!gpio_is_valid(gpio))
+ continue;
+ ret = gpio_request(gpio, "ohci_overcurrent");
+ if (ret) {
+ dev_err(&pdev->dev, "can't request overcurrent gpio %d", gpio);
+ continue;
+ }
+
+ ret = gpio_direction_input(gpio);
+ if (ret) {
+ dev_err(&pdev->dev, "can't configure overcurrent gpio %d as input", gpio);
+ continue;
+ }
+
+ ret = request_irq(gpio_to_irq(gpio),
+ ohci_hcd_at91_overcurrent_irq,
+ IRQF_SHARED, "ohci_overcurrent", pdev);
+ if (ret) {
+ gpio_free(gpio);
+ dev_warn(& pdev->dev, "cannot get GPIO IRQ for overcurrent\n");
+ }
+ }
+
+ pdev->dev.platform_data = pdata;
+
+ return 0;
+}
+#else
+static int __devinit ohci_at91_of_init(struct platform_device *pdev)
+{
+ return 0;
+}
+#endif
+
/*-------------------------------------------------------------------------*/
static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
{
- struct at91_usbh_data *pdata = pdev->dev.platform_data;
+ struct at91_usbh_data *pdata;
int i;
+ i = ohci_at91_of_init(pdev);
+
+ if (i)
+ return i;
+
+ pdata = pdev->dev.platform_data;
+
if (pdata) {
for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
if (!gpio_is_valid(pdata->vbus_pin[i]))
@@ -596,5 +694,6 @@ static struct platform_driver ohci_hcd_at91_driver = {
.driver = {
.name = "at91_ohci",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(at91_ohci_dt_ids),
},
};
--
1.7.7
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