target/linux/bcm53xx/patches-4.1/185-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 --- a/drivers/usb/host/bcma-hcd.c
  16 +++ b/drivers/usb/host/bcma-hcd.c
  17 @@ -24,6 +24,8 @@
  18  #include <linux/platform_device.h>
  19  #include <linux/module.h>
  20  #include <linux/slab.h>
  21 +#include <linux/of.h>
  22 +#include <linux/of_gpio.h>
  23  #include <linux/usb/ehci_pdriver.h>
  24  #include <linux/usb/ohci_pdriver.h>
  25
  26 @@ -224,6 +226,23 @@ static void bcma_hcd_init_chip_arm(struc
  27         }
  28  }
  29
  30 +static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
  31 +{
  32 +       int gpio;
  33 +
  34 +       gpio = of_get_named_gpio(dev->dev.of_node, "vcc-gpio", 0);
  35 +       if (!gpio_is_valid(gpio))
  36 +               return;
  37 +
  38 +       if (val) {
  39 +               gpio_request(gpio, "bcma-hcd-gpio");
  40 +               gpio_set_value(gpio, 1);
  41 +       } else {
  42 +               gpio_set_value(gpio, 0);
  43 +               gpio_free(gpio);
  44 +       }
  45 +}
  46 +
  47  static const struct usb_ehci_pdata ehci_pdata = {
  48  };
  49
  50 @@ -295,6 +314,8 @@ static int bcma_hcd_probe(struct bcma_de
  51         if (!usb_dev)
  52                 return -ENOMEM;
  53
  54 +       bcma_hci_platform_power_gpio(dev, true);
  55 +
  56         switch (dev->id.id) {
  57         case BCMA_CORE_NS_USB20:
  58                 bcma_hcd_init_chip_arm(dev);
  59 @@ -347,6 +368,7 @@ static void bcma_hcd_remove(struct bcma_
  60
  61  static void bcma_hcd_shutdown(struct bcma_device *dev)
  62  {
  63 +       bcma_hci_platform_power_gpio(dev, false);
  64         bcma_core_disable(dev, 0);
  65  }
  66
  67 @@ -354,6 +376,7 @@ static void bcma_hcd_shutdown(struct bcm
  68
  69  static int bcma_hcd_suspend(struct bcma_device *dev)
  70  {
  71 +       bcma_hci_platform_power_gpio(dev, false);
  72         bcma_core_disable(dev, 0);
  73
  74         return 0;
  75 @@ -361,6 +384,7 @@ static int bcma_hcd_suspend(struct bcma_
  76
  77  static int bcma_hcd_resume(struct bcma_device *dev)
  78  {
  79 +       bcma_hci_platform_power_gpio(dev, true);
  80         bcma_core_enable(dev, 0);
  81
  82         return 0;