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-rw-r--r--Documentation/devicetree/bindings/usb/usb-ehci.txt1
-rw-r--r--drivers/usb/host/ehci-platform.c26
2 files changed, 24 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
index ff151ec084c4..43c1a4e06767 100644
--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
@@ -15,6 +15,7 @@ Optional properties:
- clocks : a list of phandle + clock specifier pairs
- phys : phandle + phy specifier pair
- phy-names : "usb"
+ - resets : phandle + reset specifier pair
Example (Sequoia 440EPx):
ehci@e0000300 {
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index c7dd93aad20c..2f5b9ce3e042 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -29,6 +29,7 @@
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/ehci_pdriver.h>
@@ -41,6 +42,7 @@
struct ehci_platform_priv {
struct clk *clks[EHCI_MAX_CLKS];
+ struct reset_control *rst;
struct phy *phy;
};
@@ -208,6 +210,18 @@ static int ehci_platform_probe(struct platform_device *dev)
}
}
+ priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
+ if (IS_ERR(priv->rst)) {
+ err = PTR_ERR(priv->rst);
+ if (err == -EPROBE_DEFER)
+ goto err_put_clks;
+ priv->rst = NULL;
+ } else {
+ err = reset_control_deassert(priv->rst);
+ if (err)
+ goto err_put_clks;
+ }
+
if (pdata->big_endian_desc)
ehci->big_endian_desc = 1;
if (pdata->big_endian_mmio)
@@ -218,7 +232,7 @@ static int ehci_platform_probe(struct platform_device *dev)
dev_err(&dev->dev,
"Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
err = -EINVAL;
- goto err_put_clks;
+ goto err_reset;
}
#endif
#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
@@ -226,14 +240,14 @@ static int ehci_platform_probe(struct platform_device *dev)
dev_err(&dev->dev,
"Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
err = -EINVAL;
- goto err_put_clks;
+ goto err_reset;
}
#endif
if (pdata->power_on) {
err = pdata->power_on(dev);
if (err < 0)
- goto err_put_clks;
+ goto err_reset;
}
hcd->rsrc_start = res_mem->start;
@@ -256,6 +270,9 @@ static int ehci_platform_probe(struct platform_device *dev)
err_power:
if (pdata->power_off)
pdata->power_off(dev);
+err_reset:
+ if (priv->rst)
+ reset_control_assert(priv->rst);
err_put_clks:
while (--clk >= 0)
clk_put(priv->clks[clk]);
@@ -280,6 +297,9 @@ static int ehci_platform_remove(struct platform_device *dev)
if (pdata->power_off)
pdata->power_off(dev);
+ if (priv->rst)
+ reset_control_assert(priv->rst);
+
for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
clk_put(priv->clks[clk]);