target/linux/bcm53xx/patches-3.18/185-USB-bcma-add-support-for-controlling-bus-power-throu.patch

   1 From f3cf44a313b3687efd55ba091558e20a4d218c31 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Thu, 11 Jun 2015 22:57:40 +0200
   4 Subject: [PATCH] USB: bcma: add support for controlling bus power through GPIO
   5
   6 On some boards a GPIO is needed to activate USB controller. Make it
   7 possible to specify such a GPIO in device tree.
   8
   9 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  10 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  11 ---
  12  drivers/usb/host/bcma-hcd.c | 24 ++++++++++++++++++++++++
  13  1 file changed, 24 insertions(+)
  14
  15 diff --git a/drivers/usb/host/bcma-hcd.c b/drivers/usb/host/bcma-hcd.c
  16 index 983bc67..a01c6ce 100644
  17 --- a/drivers/usb/host/bcma-hcd.c
  18 +++ b/drivers/usb/host/bcma-hcd.c
  19 @@ -24,6 +24,8 @@
  20  #include <linux/platform_device.h>
  21  #include <linux/module.h>
  22  #include <linux/slab.h>
  23 +#include <linux/of.h>
  24 +#include <linux/of_gpio.h>
  25  #include <linux/usb/ehci_pdriver.h>
  26  #include <linux/usb/ohci_pdriver.h>
  27
  28 @@ -224,6 +226,23 @@ static void bcma_hcd_init_chip_arm(struct bcma_device *dev)
  29         }
  30  }
  31
  32 +static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
  33 +{
  34 +       int gpio;
  35 +
  36 +       gpio = of_get_named_gpio(dev->dev.of_node, "vcc-gpio", 0);
  37 +       if (!gpio_is_valid(gpio))
  38 +               return;
  39 +
  40 +       if (val) {
  41 +               gpio_request(gpio, "bcma-hcd-gpio");
  42 +               gpio_set_value(gpio, 1);
  43 +       } else {
  44 +               gpio_set_value(gpio, 0);
  45 +               gpio_free(gpio);
  46 +       }
  47 +}
  48 +
  49  static const struct usb_ehci_pdata ehci_pdata = {
  50  };
  51
  52 @@ -295,6 +314,8 @@ static int bcma_hcd_probe(struct bcma_device *dev)
  53         if (!usb_dev)
  54                 return -ENOMEM;
  55
  56 +       bcma_hci_platform_power_gpio(dev, true);
  57 +
  58         switch (dev->id.id) {
  59         case BCMA_CORE_NS_USB20:
  60                 bcma_hcd_init_chip_arm(dev);
  61 @@ -347,6 +368,7 @@ static void bcma_hcd_remove(struct bcma_device *dev)
  62
  63  static void bcma_hcd_shutdown(struct bcma_device *dev)
  64  {
  65 +       bcma_hci_platform_power_gpio(dev, false);
  66         bcma_core_disable(dev, 0);
  67  }
  68
  69 @@ -354,6 +376,7 @@ static void bcma_hcd_shutdown(struct bcma_device *dev)
  70
  71  static int bcma_hcd_suspend(struct bcma_device *dev)
  72  {
  73 +       bcma_hci_platform_power_gpio(dev, false);
  74         bcma_core_disable(dev, 0);
  75
  76         return 0;
  77 @@ -361,6 +384,7 @@ static int bcma_hcd_suspend(struct bcma_device *dev)
  78
  79  static int bcma_hcd_resume(struct bcma_device *dev)
  80  {
  81 +       bcma_hci_platform_power_gpio(dev, true);
  82         bcma_core_enable(dev, 0);
  83
  84         return 0;
  85 --
  86 1.8.4.5
  87