[PATCH 2/2] ehci-platform: Add support for clks and phy passed through devicetree
Hans de Goede
hdegoede at redhat.com
Sun Jan 5 18:04:40 EST 2014
Currently ehci-platform is only used in combination with devicetree when used
with some via socs. By extending it to (optionally) get clks and a phy from
devicetree, and enabling / disabling those on power_on / off, it can be used
more generically. Specifically after this commit it can be used for the
ehci controller on Allwinner sunxi SoCs.
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
.../devicetree/bindings/usb/platform-ehci.txt | 25 +++++
.../devicetree/bindings/usb/vt8500-ehci.txt | 12 --
drivers/usb/host/ehci-platform.c | 125 +++++++++++++++++----
3 files changed, 131 insertions(+), 31 deletions(-)
create mode 100644 Documentation/devicetree/bindings/usb/platform-ehci.txt
delete mode 100644 Documentation/devicetree/bindings/usb/vt8500-ehci.txt
diff --git a/Documentation/devicetree/bindings/usb/platform-ehci.txt b/Documentation/devicetree/bindings/usb/platform-ehci.txt
new file mode 100644
index 0000000..aba6da1
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/platform-ehci.txt
@@ -0,0 +1,25 @@
+Generic Platform EHCI controller
+
+Required properties:
+ - compatible: Should be "platform-ehci"
+ (legacy: via,vt8500-ehci" or "wm,prizm-ehci")
+ - reg: Address range of the ehci registers.
+ - interrupts: Should contain the ehci interrupt.
+
+Optional properties:
+ - clocks: array of clocks
+ - clock-names: clock names "ahb" and/or "ehci"
+ - phys: phy
+ - phy-names: "usb_phy"
+
+Example:
+
+usb: ehci at D8007100 {
+ compatible = "platform-ehci";
+ reg = <0xD8007100 0x200>;
+ interrupts = <1>;
+ clocks = <&ahb_gates 2>, <&usb_clk 6>;
+ clock-names = "ahb", "ehci";
+ phys = <&usbphy 1>;
+ phy-names = "usb_phy";
+};
diff --git a/Documentation/devicetree/bindings/usb/vt8500-ehci.txt b/Documentation/devicetree/bindings/usb/vt8500-ehci.txt
deleted file mode 100644
index 5fb8fd6..0000000
--- a/Documentation/devicetree/bindings/usb/vt8500-ehci.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-VIA VT8500 and Wondermedia WM8xxx SoC USB controllers.
-
-Required properties:
- - compatible: Should be "via,vt8500-ehci" or "wm,prizm-ehci".
- - reg: Address range of the ehci registers. size should be 0x200
- - interrupts: Should contain the ehci interrupt.
-
-usb: ehci at D8007100 {
- compatible = "wm,prizm-ehci", "usb-ehci";
- reg = <0xD8007100 0x200>;
- interrupts = <1>;
-};
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 7f30b71..01d9a97 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -18,6 +18,7 @@
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
+#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/kernel.h>
@@ -25,6 +26,7 @@
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
@@ -34,6 +36,12 @@
#define DRIVER_DESC "EHCI generic platform driver"
+struct ehci_platform_priv {
+ struct clk *ahb_clk;
+ struct clk *ehci_clk;
+ struct phy *phy;
+};
+
static const char hcd_name[] = "ehci-platform";
static int ehci_platform_reset(struct usb_hcd *hcd)
@@ -64,13 +72,79 @@ static int ehci_platform_reset(struct usb_hcd *hcd)
return 0;
}
+static int ehci_platform_power_on(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ehci_platform_priv *priv =
+ (struct ehci_platform_priv *)hcd_to_ehci(hcd)->priv;
+ int ret;
+
+ if (!IS_ERR(priv->ehci_clk)) {
+ ret = clk_prepare_enable(priv->ehci_clk);
+ if (ret)
+ return ret;
+ }
+
+ if (!IS_ERR(priv->ahb_clk)) {
+ ret = clk_prepare_enable(priv->ahb_clk);
+ if (ret)
+ goto err_disable_ehci_clk;
+ }
+
+ if (!IS_ERR(priv->phy)) {
+ ret = phy_init(priv->phy);
+ if (ret)
+ goto err_disable_ahb_clk;
+
+ ret = phy_power_on(priv->phy);
+ if (ret)
+ goto err_exit_phy;
+ }
+
+ return 0;
+
+err_exit_phy:
+ phy_exit(priv->phy);
+err_disable_ahb_clk:
+ if (!IS_ERR(priv->ahb_clk))
+ clk_disable_unprepare(priv->ahb_clk);
+err_disable_ehci_clk:
+ if (!IS_ERR(priv->ehci_clk))
+ clk_disable_unprepare(priv->ehci_clk);
+
+ return ret;
+}
+
+static void ehci_platform_power_off(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ehci_platform_priv *priv =
+ (struct ehci_platform_priv *)hcd_to_ehci(hcd)->priv;
+
+ if (!IS_ERR(priv->phy)) {
+ phy_power_off(priv->phy);
+ phy_exit(priv->phy);
+ }
+
+ if (!IS_ERR(priv->ahb_clk))
+ clk_disable_unprepare(priv->ahb_clk);
+
+ if (!IS_ERR(priv->ehci_clk))
+ clk_disable_unprepare(priv->ehci_clk);
+}
+
static struct hc_driver __read_mostly ehci_platform_hc_driver;
static const struct ehci_driver_overrides platform_overrides __initconst = {
- .reset = ehci_platform_reset,
+ .reset = ehci_platform_reset,
+ .extra_priv_size = sizeof(struct ehci_platform_priv),
};
-static struct usb_ehci_pdata ehci_platform_defaults;
+static struct usb_ehci_pdata ehci_platform_defaults = {
+ .power_on = ehci_platform_power_on,
+ .power_suspend = ehci_platform_power_off,
+ .power_off = ehci_platform_power_off,
+};
static int ehci_platform_probe(struct platform_device *dev)
{
@@ -85,7 +159,7 @@ static int ehci_platform_probe(struct platform_device *dev)
/*
* use reasonable defaults so platforms don't have to provide these.
- * with DT probing on ARM, none of these are set.
+ * with DT probing on ARM.
*/
if (!dev_get_platdata(&dev->dev))
dev->dev.platform_data = &ehci_platform_defaults;
@@ -107,17 +181,30 @@ static int ehci_platform_probe(struct platform_device *dev)
return -ENXIO;
}
+ hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
+ dev_name(&dev->dev));
+ if (!hcd)
+ return -ENOMEM;
+
+ if (pdata == &ehci_platform_defaults) {
+ struct ehci_platform_priv *priv = (struct ehci_platform_priv *)
+ hcd_to_ehci(hcd)->priv;
+
+ priv->phy = devm_phy_get(&dev->dev, "usb_phy");
+ if (IS_ERR(priv->phy) && PTR_ERR(priv->phy) == -EPROBE_DEFER) {
+ err = -EPROBE_DEFER;
+ goto err_put_hcd;
+ }
+
+ priv->ehci_clk = devm_clk_get(&dev->dev, "ehci");
+ priv->ahb_clk = devm_clk_get(&dev->dev, "ahb");
+ }
+
+ platform_set_drvdata(dev, hcd);
if (pdata->power_on) {
err = pdata->power_on(dev);
if (err < 0)
- return err;
- }
-
- hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
- dev_name(&dev->dev));
- if (!hcd) {
- err = -ENOMEM;
- goto err_power;
+ goto err_put_hcd;
}
hcd->rsrc_start = res_mem->start;
@@ -126,21 +213,19 @@ static int ehci_platform_probe(struct platform_device *dev)
hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
if (IS_ERR(hcd->regs)) {
err = PTR_ERR(hcd->regs);
- goto err_put_hcd;
+ goto err_power;
}
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err)
- goto err_put_hcd;
-
- platform_set_drvdata(dev, hcd);
+ goto err_power;
return err;
-err_put_hcd:
- usb_put_hcd(hcd);
err_power:
if (pdata->power_off)
pdata->power_off(dev);
+err_put_hcd:
+ usb_put_hcd(hcd);
return err;
}
@@ -203,11 +288,13 @@ static int ehci_platform_resume(struct device *dev)
#define ehci_platform_resume NULL
#endif /* CONFIG_PM */
-static const struct of_device_id vt8500_ehci_ids[] = {
+static const struct of_device_id ehci_platform_ids[] = {
{ .compatible = "via,vt8500-ehci", },
{ .compatible = "wm,prizm-ehci", },
+ { .compatible = "platform-ehci", },
{}
};
+MODULE_DEVICE_TABLE(of, ehci_platform_ids);
static const struct platform_device_id ehci_platform_table[] = {
{ "ehci-platform", 0 },
@@ -229,7 +316,7 @@ static struct platform_driver ehci_platform_driver = {
.owner = THIS_MODULE,
.name = "ehci-platform",
.pm = &ehci_platform_pm_ops,
- .of_match_table = vt8500_ehci_ids,
+ .of_match_table = ehci_platform_ids,
}
};
--
1.8.4.2
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