83 lines
2.1 KiB
Diff
83 lines
2.1 KiB
Diff
From f3cf44a313b3687efd55ba091558e20a4d218c31 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Thu, 11 Jun 2015 22:57:40 +0200
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Subject: [PATCH] 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
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possible to specify such a GPIO in device tree.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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drivers/usb/host/bcma-hcd.c | 24 ++++++++++++++++++++++++
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1 file changed, 24 insertions(+)
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--- a/drivers/usb/host/bcma-hcd.c
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+++ b/drivers/usb/host/bcma-hcd.c
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@@ -24,6 +24,8 @@
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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+#include <linux/of.h>
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+#include <linux/of_gpio.h>
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#include <linux/usb/ehci_pdriver.h>
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#include <linux/usb/ohci_pdriver.h>
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@@ -224,6 +226,23 @@ static void bcma_hcd_init_chip_arm(struc
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}
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}
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+static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
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+{
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+ int gpio;
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+
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+ gpio = of_get_named_gpio(dev->dev.of_node, "vcc-gpio", 0);
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+ if (!gpio_is_valid(gpio))
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+ return;
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+
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+ if (val) {
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+ gpio_request(gpio, "bcma-hcd-gpio");
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+ gpio_set_value(gpio, 1);
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+ } else {
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+ gpio_set_value(gpio, 0);
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+ gpio_free(gpio);
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+ }
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+}
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+
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static const struct usb_ehci_pdata ehci_pdata = {
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};
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@@ -295,6 +314,8 @@ static int bcma_hcd_probe(struct bcma_de
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if (!usb_dev)
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return -ENOMEM;
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+ bcma_hci_platform_power_gpio(dev, true);
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+
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switch (dev->id.id) {
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case BCMA_CORE_NS_USB20:
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bcma_hcd_init_chip_arm(dev);
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@@ -347,6 +368,7 @@ static void bcma_hcd_remove(struct bcma_
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static void bcma_hcd_shutdown(struct bcma_device *dev)
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{
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+ bcma_hci_platform_power_gpio(dev, false);
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bcma_core_disable(dev, 0);
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}
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@@ -354,6 +376,7 @@ static void bcma_hcd_shutdown(struct bcm
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static int bcma_hcd_suspend(struct bcma_device *dev)
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{
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+ bcma_hci_platform_power_gpio(dev, false);
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bcma_core_disable(dev, 0);
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return 0;
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@@ -361,6 +384,7 @@ static int bcma_hcd_suspend(struct bcma_
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static int bcma_hcd_resume(struct bcma_device *dev)
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{
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+ bcma_hci_platform_power_gpio(dev, true);
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bcma_core_enable(dev, 0);
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return 0;
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