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authorAndrey Smirnov <andrew.smirnov@gmail.com>2017-06-03 20:11:54 -0700
committerSascha Hauer <s.hauer@pengutronix.de>2017-06-06 08:27:16 +0200
commita762345c7c331cf0c80819ab2fc368f3cec0a4e9 (patch)
treeda118269da92a8ac28102c52331d7a8457a3c2db /drivers/phy
parent37e6bee7e55ca1fbea5aefa0e64184fa10936276 (diff)
downloadbarebox-a762345c7c331cf0c80819ab2fc368f3cec0a4e9.tar.gz
usb-nop-xceiv: Add support for 'reset-gpios' binding
Cc: cphealy@gmail.com Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/usb-nop-xceiv.c45
1 files changed, 41 insertions, 4 deletions
diff --git a/drivers/phy/usb-nop-xceiv.c b/drivers/phy/usb-nop-xceiv.c
index d403fe4..b124e6c 100644
--- a/drivers/phy/usb-nop-xceiv.c
+++ b/drivers/phy/usb-nop-xceiv.c
@@ -22,12 +22,15 @@
#include <linux/phy/phy.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <gpio.h>
+#include <of_gpio.h>
struct nop_usbphy {
struct usb_phy usb_phy;
struct phy *phy;
struct phy_provider *provider;
struct clk *clk;
+ int reset;
};
static struct phy *nop_usbphy_xlate(struct device_d *dev,
@@ -40,9 +43,22 @@ static struct phy *nop_usbphy_xlate(struct device_d *dev,
static int nop_usbphy_init(struct phy *phy)
{
+ int ret;
struct nop_usbphy *nopphy = phy_get_drvdata(phy);
- return clk_enable(nopphy->clk);
+ ret = clk_enable(nopphy->clk);
+ if (ret < 0)
+ return ret;
+
+ if (gpio_is_valid(nopphy->reset)) {
+ /*
+ * Let's wait for 100 ms before deasserting reset line
+ */
+ mdelay(100);
+ gpio_set_active(nopphy->reset, false);
+ }
+
+ return 0;
}
static struct usb_phy *nop_usbphy_to_usbphy(struct phy *phy)
@@ -61,6 +77,9 @@ static int nop_usbphy_probe(struct device_d *dev)
{
int ret;
struct nop_usbphy *nopphy;
+ enum of_gpio_flags of_flags;
+ char *name = NULL;
+ unsigned long flags = GPIOF_OUT_INIT_ACTIVE;
nopphy = xzalloc(sizeof(*nopphy));
@@ -70,6 +89,20 @@ static int nop_usbphy_probe(struct device_d *dev)
if (IS_ERR(nopphy->clk))
nopphy->clk = NULL;
+ nopphy->reset = of_get_named_gpio_flags(dev->device_node,
+ "reset-gpios", 0, &of_flags);
+ if (gpio_is_valid(nopphy->reset)) {
+ /* assert reset */
+
+ if (of_flags & OF_GPIO_ACTIVE_LOW)
+ flags |= GPIOF_ACTIVE_LOW;
+
+ name = basprintf("%s reset", dev_name(dev));
+ ret = gpio_request_one(nopphy->reset, flags, name);
+ if (ret < 0)
+ goto err_free;
+ }
+
/* FIXME: Add vbus regulator support */
/* FIXME: Add vbus-detect-gpio support */
@@ -77,7 +110,7 @@ static int nop_usbphy_probe(struct device_d *dev)
nopphy->phy = phy_create(dev, NULL, &nop_phy_ops, NULL);
if (IS_ERR(nopphy->phy)) {
ret = PTR_ERR(nopphy->phy);
- goto err_free;
+ goto release_gpio;
}
phy_set_drvdata(nopphy->phy, nopphy);
@@ -85,13 +118,17 @@ static int nop_usbphy_probe(struct device_d *dev)
nopphy->provider = of_phy_provider_register(dev, nop_usbphy_xlate);
if (IS_ERR(nopphy->provider)) {
ret = PTR_ERR(nopphy->provider);
- goto err_free;
+ goto release_gpio;
}
return 0;
+
+release_gpio:
+ if (gpio_is_valid(nopphy->reset))
+ gpio_free(nopphy->reset);
err_free:
free(nopphy);
-
+ free(name);
return ret;
};