diff options
| author | Hauke Mehrtens <hauke@hauke-m.de> | 2015-06-11 22:57:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-22 15:43:34 -0700 |
| commit | eb4861c3cef7f745df0d2a26b0f4287da0190424 (patch) | |
| tree | e9d318d85d7b5862498e0ea064b97103b1af560d /drivers/usb/host/bcma-hcd.c | |
| parent | 10bc04b744c69f253dfe47bc143325349ce8becc (diff) | |
USB: bcma: add support for controlling bus power through GPIO
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>
Diffstat (limited to 'drivers/usb/host/bcma-hcd.c')
| -rw-r--r-- | drivers/usb/host/bcma-hcd.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/usb/host/bcma-hcd.c b/drivers/usb/host/bcma-hcd.c index 96f172581a85..5398e3d42822 100644 --- a/drivers/usb/host/bcma-hcd.c +++ b/drivers/usb/host/bcma-hcd.c @@ -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; |