You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
2.4 KiB
76 lines
2.4 KiB
9 years ago
|
From 9faae5a37b266afca6914163316856c5ed4ec366 Mon Sep 17 00:00:00 2001
|
||
|
9 years ago
|
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
|
||
|
9 years ago
|
Date: Sun, 1 Nov 2015 10:04:41 +0100
|
||
|
|
Subject: [PATCH] USB: bcma: switch to GPIO descriptor for power control
|
||
|
9 years ago
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
So far we were using simple (legacy) GPIO functions & some poor logic to
|
||
|
|
control power. It got many drawbacks: we were ignoring OF flags
|
||
|
|
(GPIO_ACTIVE_LOW), we were not setting direction to output and we were
|
||
|
|
assuming gpio_request success all the time.
|
||
|
|
Fix it by switching to gpiod functions and adding appropriate checks.
|
||
|
|
|
||
|
|
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
|
||
|
9 years ago
|
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
|
||
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
||
|
9 years ago
|
---
|
||
|
|
drivers/usb/host/bcma-hcd.c | 21 ++++++++++-----------
|
||
|
|
1 file changed, 10 insertions(+), 11 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/usb/host/bcma-hcd.c
|
||
|
|
+++ b/drivers/usb/host/bcma-hcd.c
|
||
|
|
@@ -21,6 +21,7 @@
|
||
|
|
*/
|
||
|
|
#include <linux/bcma/bcma.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
+#include <linux/gpio/consumer.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
@@ -36,6 +37,7 @@ MODULE_LICENSE("GPL");
|
||
|
|
struct bcma_hcd_device {
|
||
|
|
struct platform_device *ehci_dev;
|
||
|
|
struct platform_device *ohci_dev;
|
||
|
|
+ struct gpio_desc *gpio_desc;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Wait for bitmask in a register to get set or cleared.
|
||
|
9 years ago
|
@@ -228,19 +230,12 @@ static void bcma_hcd_init_chip_arm(struct bcma_device *dev)
|
||
|
9 years ago
|
|
||
|
|
static void bcma_hci_platform_power_gpio(struct bcma_device *dev, bool val)
|
||
|
|
{
|
||
|
|
- int gpio;
|
||
|
|
+ struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
|
||
|
|
|
||
|
|
- gpio = of_get_named_gpio(dev->dev.of_node, "vcc-gpio", 0);
|
||
|
|
- if (!gpio_is_valid(gpio))
|
||
|
|
+ if (IS_ERR_OR_NULL(usb_dev->gpio_desc))
|
||
|
|
return;
|
||
|
|
|
||
|
|
- if (val) {
|
||
|
|
- gpio_request(gpio, "bcma-hcd-gpio");
|
||
|
|
- gpio_set_value(gpio, 1);
|
||
|
|
- } else {
|
||
|
|
- gpio_set_value(gpio, 0);
|
||
|
|
- gpio_free(gpio);
|
||
|
|
- }
|
||
|
|
+ gpiod_set_value(usb_dev->gpio_desc, val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct usb_ehci_pdata ehci_pdata = {
|
||
|
9 years ago
|
@@ -314,7 +309,11 @@ static int bcma_hcd_probe(struct bcma_device *dev)
|
||
|
9 years ago
|
if (!usb_dev)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
- bcma_hci_platform_power_gpio(dev, true);
|
||
|
|
+ if (dev->dev.of_node)
|
||
|
|
+ usb_dev->gpio_desc = devm_get_gpiod_from_child(&dev->dev, "vcc",
|
||
|
|
+ &dev->dev.of_node->fwnode);
|
||
|
|
+ if (!IS_ERR_OR_NULL(usb_dev->gpio_desc))
|
||
|
|
+ gpiod_direction_output(usb_dev->gpio_desc, 1);
|
||
|
|
|
||
|
|
switch (dev->id.id) {
|
||
|
|
case BCMA_CORE_NS_USB20:
|