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usb: phy: generic: migrate to gpio_desc

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Change internal gpio handling from integer gpios into gpio
descriptors. This change only addresses the internal API and
device-tree/ACPI, while the legacy platform data remains integer space
based.

This change is only build compile tested, and very prone to error. I
leave this comment for now in the commit message so that this patch gets
some testing as I'm pretty sure it's buggy.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Robert Jarzmik 2014-12-06 22:05:13 +01:00 committed by Felipe Balbi
parent e3a912a124
commit e9f2cefb0c
2 changed files with 21 additions and 44 deletions
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61
drivers/usb/phy/phy-generic.c
View File

@ -59,16 +59,8 @@ static int nop_set_suspend(struct usb_phy *x, int suspend)
static void nop_reset_set(struct usb_phy_generic *nop, int asserted)
{
int value;
if (!gpio_is_valid(nop->gpio_reset))
return;
value = asserted;
if (nop->reset_active_low)
value = !value;
gpio_set_value_cansleep(nop->gpio_reset, value);
if (nop->gpiod_reset)
gpiod_set_value(nop->gpiod_reset, asserted);
if (!asserted)
usleep_range(10000, 20000);
@ -143,35 +135,38 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
struct usb_phy_generic_platform_data *pdata)
{
enum usb_phy_type type = USB_PHY_TYPE_USB2;
int err;
int err = 0;
u32 clk_rate = 0;
bool needs_vcc = false;
nop->reset_active_low = true; /* default behaviour */
if (dev->of_node) {
struct device_node *node = dev->of_node;
enum of_gpio_flags flags = 0;
if (of_property_read_u32(node, "clock-frequency", &clk_rate))
clk_rate = 0;
needs_vcc = of_property_read_bool(node, "vcc-supply");
nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
0, &flags);
if (nop->gpio_reset == -EPROBE_DEFER)
return -EPROBE_DEFER;
nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
nop->gpiod_reset = devm_gpiod_get(dev, "reset-gpios");
err = PTR_ERR(nop->gpiod_reset);
} else if (pdata) {
type = pdata->type;
clk_rate = pdata->clk_rate;
needs_vcc = pdata->needs_vcc;
nop->gpio_reset = pdata->gpio_reset;
} else {
nop->gpio_reset = -1;
if (gpio_is_valid(gpio->gpio_reset)) {
err = devm_gpio_request_one(dev, pdata->gpio_reset, 0,
dev_name(dev));
if (!err)
nop->gpiod_reset =
gpio_to_desc(pdata->gpio_reset);
}
}
if (err == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (err) {
dev_err(dev, "Error requesting RESET GPIO\n");
return err;
}
nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
@ -201,24 +196,6 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
return -EPROBE_DEFER;
}
if (gpio_is_valid(nop->gpio_reset)) {
unsigned long gpio_flags;
/* Assert RESET */
if (nop->reset_active_low)
gpio_flags = GPIOF_OUT_INIT_LOW;
else
gpio_flags = GPIOF_OUT_INIT_HIGH;
err = devm_gpio_request_one(dev, nop->gpio_reset,
gpio_flags, dev_name(dev));
if (err) {
dev_err(dev, "Error requesting RESET GPIO %d\n",
nop->gpio_reset);
return err;
}
}
nop->dev = dev;
nop->phy.dev = nop->dev;
nop->phy.label = "nop-xceiv";

4
drivers/usb/phy/phy-generic.h
View File

@ -2,14 +2,14 @@
#define _PHY_GENERIC_H_
#include <linux/usb/usb_phy_generic.h>
#include <linux/gpio/consumer.h>
struct usb_phy_generic {
struct usb_phy phy;
struct device *dev;
struct clk *clk;
struct regulator *vcc;
int gpio_reset;
bool reset_active_low;
struct gpio_desc *gpiod_reset;
};
int usb_gen_phy_init(struct usb_phy *phy);