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authorMaxime Ripard <maxime.ripard@free-electrons.com>2014-05-13 17:44:20 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-27 15:53:00 -0700
commit4615f3bd089fc4c549ed90e14982b360779feb50 (patch)
treed9a0820c9679ca20a4af417c90f021affc8d55e8
parent38e0c109404506266e33c29c77c2da39630954a4 (diff)
usb: ohci-platform: Enable optional use of reset controller
The OHCI controllers used in the Allwinner A31 are asserted in reset using a global reset controller. Add optional support for such a controller in the OHCI platform driver. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--Documentation/devicetree/bindings/usb/usb-ohci.txt1
-rw-r--r--drivers/usb/host/ohci-platform.c27
2 files changed, 25 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
index 45f67d91e88..b968a1aea99 100644
--- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
@@ -12,6 +12,7 @@ Optional properties:
- clocks : a list of phandle + clock specifier pairs
- phys : phandle + phy specifier pair
- phy-names : "usb"
+- resets : phandle + reset specifier pair
Example:
diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
index b6002c951c5..4369299064c 100644
--- a/drivers/usb/host/ohci-platform.c
+++ b/drivers/usb/host/ohci-platform.c
@@ -24,6 +24,7 @@
#include <linux/err.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/usb/ohci_pdriver.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
@@ -36,6 +37,7 @@
struct ohci_platform_priv {
struct clk *clks[OHCI_MAX_CLKS];
+ struct reset_control *rst;
struct phy *phy;
};
@@ -191,6 +193,19 @@ static int ohci_platform_probe(struct platform_device *dev)
break;
}
}
+
+ }
+
+ 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)
@@ -203,7 +218,7 @@ static int ohci_platform_probe(struct platform_device *dev)
dev_err(&dev->dev,
"Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
err = -EINVAL;
- goto err_put_clks;
+ goto err_reset;
}
#endif
#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
@@ -211,14 +226,14 @@ static int ohci_platform_probe(struct platform_device *dev)
dev_err(&dev->dev,
"Error: CONFIG_USB_OHCI_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;
@@ -242,6 +257,9 @@ static int ohci_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]);
@@ -266,6 +284,9 @@ static int ohci_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 < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
clk_put(priv->clks[clk]);