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at91: ohci-at91: add vbus_pin_inverted platform attribute

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The existing OHCI AT91 driver made the assumption that the enable
input of the USB power switch was active low. However, some USB power
switches such as the Micrel MIC2026-1 [1] have an active high input to
enable the power. A new vbus_pin_inverted attribute is added to the
at91_usbh_data structure so that board files can tell the OHCI driver
if the vbus pin logic is active low or active high.

[1] http://www.micrel.com/page.do?page=product-info/products/mic2026.shtml

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Thomas Petazzoni 2011-07-13 11:29:16 +02:00 committed by Arnd Bergmann
parent 0af4316bab
commit e7da859e42
2 changed files with 3 additions and 2 deletions
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1
arch/arm/mach-at91/include/mach/board.h
View file

@ -98,6 +98,7 @@ extern void __init at91_add_device_eth(struct at91_eth_data *data);
struct at91_usbh_data {
u8 ports; /* number of ports on root hub */
u8 vbus_pin[2]; /* port power-control pin */
u8 vbus_pin_inverted;
};
extern void __init at91_add_device_usbh(struct at91_usbh_data *data);
extern void __init at91_add_device_usbh_ohci(struct at91_usbh_data *data);

4
drivers/usb/host/ohci-at91.c
View file

@ -279,7 +279,7 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
if (pdata->vbus_pin[i] <= 0)
continue;
gpio_request(pdata->vbus_pin[i], "ohci_vbus");
gpio_direction_output(pdata->vbus_pin[i], 0);
gpio_direction_output(pdata->vbus_pin[i], pdata->vbus_pin_inverted);
}
}
@ -296,7 +296,7 @@ static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
if (pdata->vbus_pin[i] <= 0)
continue;
gpio_direction_output(pdata->vbus_pin[i], 1);
gpio_direction_output(pdata->vbus_pin[i], !pdata->vbus_pin_inverted);
gpio_free(pdata->vbus_pin[i]);
}
}