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From 0cb136f9882e4649ad6160bb7b48955ff728888c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Sun, 1 Nov 2015 08:17:21 +0100
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Subject: [PATCH V2] USB: bcma: switch to GPIO descriptor for power control
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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So far we were using simple (legacy) GPIO functions & some poor logic to
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control power. It got many drawbacks: we were ignoring OF flags
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(GPIO_ACTIVE_LOW), we were not setting direction to output and we were
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assuming gpio_request success all the time.
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Fix it by switching to gpiod functions and adding appropriate checks.
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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---
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drivers/usb/host/bcma-hcd.c | 21 ++++++++++-----------
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1 file changed, 10 insertions(+), 11 deletions(-)
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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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@@ -21,6 +21,7 @@
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*/
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#include <linux/bcma/bcma.h>
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#include <linux/delay.h>
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+#include <linux/gpio/consumer.h>
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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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@@ -36,6 +37,7 @@ MODULE_LICENSE("GPL");
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struct bcma_hcd_device {
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struct platform_device *ehci_dev;
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struct platform_device *ohci_dev;
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+ struct gpio_desc *gpio_desc;
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};
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/* Wait for bitmask in a register to get set or cleared.
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@@ -228,19 +230,12 @@ static void bcma_hcd_init_chip_arm(struc
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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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+ struct bcma_hcd_device *usb_dev = bcma_get_drvdata(dev);
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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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+ if (IS_ERR_OR_NULL(usb_dev->gpio_desc))
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return;
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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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+ gpiod_set_value(usb_dev->gpio_desc, val);
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}
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static const struct usb_ehci_pdata ehci_pdata = {
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@@ -314,7 +309,11 @@ 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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+ if (dev->dev.of_node)
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+ usb_dev->gpio_desc = devm_get_gpiod_from_child(&dev->dev, "vcc",
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+ &dev->dev.of_node->fwnode);
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+ if (!IS_ERR_OR_NULL(usb_dev->gpio_desc))
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+ gpiod_direction_output(usb_dev->gpio_desc, 1);
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switch (dev->id.id) {
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case BCMA_CORE_NS_USB20:
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