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USB: bcma: add support for controlling bus power through GPIO

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On some boards a GPIO is needed to activate USB controller. Make it
possible to specify such a GPIO in device tree.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hauke Mehrtens 2015-06-11 22:57:40 +02:00 committed by Greg Kroah-Hartman
parent 10bc04b744
commit eb4861c3ce
1 changed files with 24 additions and 0 deletions
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24
drivers/usb/host/bcma-hcd.c
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@ -24,6 +24,8 @@
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/usb/ehci_pdriver.h>
#include <linux/usb/ohci_pdriver.h>
@ -224,6 +226,23 @@ static void bcma_hcd_init_chip_arm(struct bcma_device *dev)
}
}
static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
{
int gpio;
gpio = of_get_named_gpio(dev->dev.of_node, "vcc-gpio", 0);
if (!gpio_is_valid(gpio))
return;
if (val) {
gpio_request(gpio, "bcma-hcd-gpio");
gpio_set_value(gpio, 1);
} else {
gpio_set_value(gpio, 0);
gpio_free(gpio);
}
}
static const struct usb_ehci_pdata ehci_pdata = {
};
@ -295,6 +314,8 @@ static int bcma_hcd_probe(struct bcma_device *dev)
if (!usb_dev)
return -ENOMEM;
bcma_hci_platform_power_gpio(dev, true);
switch (dev->id.id) {
case BCMA_CORE_NS_USB20:
bcma_hcd_init_chip_arm(dev);
@ -347,6 +368,7 @@ static void bcma_hcd_remove(struct bcma_device *dev)
static void bcma_hcd_shutdown(struct bcma_device *dev)
{
bcma_hci_platform_power_gpio(dev, false);
bcma_core_disable(dev, 0);
}
@ -354,6 +376,7 @@ static void bcma_hcd_shutdown(struct bcma_device *dev)
static int bcma_hcd_suspend(struct bcma_device *dev)
{
bcma_hci_platform_power_gpio(dev, false);
bcma_core_disable(dev, 0);
return 0;
@ -361,6 +384,7 @@ static int bcma_hcd_suspend(struct bcma_device *dev)
static int bcma_hcd_resume(struct bcma_device *dev)
{
bcma_hci_platform_power_gpio(dev, true);
bcma_core_enable(dev, 0);
return 0;