The PHY clock, clock rate, VCC regulator and RESET regulator
can now be provided via device tree.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Acked-by: Felipe Balbi <balbi@xxxxxx>
---
.../devicetree/bindings/usb/usb-nop-xceiv.txt | 34 ++++++++++++++++++
drivers/usb/otg/nop-usb-xceiv.c | 36 +++++++++++++++----
2 files changed, 62 insertions(+), 8 deletions(-)
create mode 100644 Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
diff --git a/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
new file mode 100644
index 0000000..d7e2726
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
@@ -0,0 +1,34 @@
+USB NOP PHY
+
+Required properties:
+- compatible: should be usb-nop-xceiv
+
+Optional properties:
+- clocks: phandle to the PHY clock. Use as per Documentation/devicetree
+ /bindings/clock/clock-bindings.txt
+ This property is required if clock-frequency is specified.
+
+- clock-names: Should be "main_clk"
+
+- clock-frequency: the clock frequency (in Hz) that the PHY clock must
+ be configured to.
+
+- vcc-supply: phandle to the regulator that provides RESET to the PHY.
+
+- reset-supply: phandle to the regulator that provides power to the PHY.
+
+Example:
+
+ hsusb1_phy {
+ compatible = "usb-nop-xceiv";
+ clock-frequency = <19200000>;
+ clocks = <&osc 0>;
+ clock-names = "main_clk";
+ vcc-supply = <&hsusb1_vcc_regulator>;
+ reset-supply = <&hsusb1_reset_regulator>;
+ };
+
+hsusb1_phy is a NOP USB PHY device that gets its clock from an oscillator
+and expects that clock to be configured to 19.2MHz by the NOP PHY driver.
+hsusb1_vcc_regulator provides power to the PHY and hsusb1_reset_regulator
+controls RESET.
diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
index ac027a1..6b7a9a0 100644
--- a/drivers/usb/otg/nop-usb-xceiv.c
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -34,13 +34,15 @@
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
+#include <linux/of.h>
struct nop_usb_xceiv {
- struct usb_phy phy;
- struct device *dev;
- struct clk *clk;
- struct regulator *vcc;
- struct regulator *reset;
+ struct usb_phy phy;
+ struct device *dev;
+ struct clk *clk;
+ struct regulator *vcc;
+ struct regulator *reset;
+ u32 clk_rate;
};
static struct platform_device *pd;
@@ -140,6 +142,7 @@ static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
static int nop_usb_xceiv_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct nop_usb_xceiv_platform_data *pdata = pdev->dev.platform_data;
struct nop_usb_xceiv *nop;
enum usb_phy_type type = USB_PHY_TYPE_USB2;
@@ -153,8 +156,17 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
if (!nop->phy.otg)
return -ENOMEM;
- if (pdata)
+ if (dev->of_node) {
+ struct device_node *node = dev->of_node;
+ u32 clk_rate;
+
+ if (!of_property_read_u32(node, "clock-frequency", &clk_rate))
+ nop->clk_rate = clk_rate;
+
+ } else if (pdata) {
type = pdata->type;
+ nop->clk_rate = pdata->clk_rate;
+ }
nop->clk = devm_clk_get(&pdev->dev, "main_clk");
if (IS_ERR(nop->clk)) {
@@ -162,8 +174,8 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
PTR_ERR(nop->clk));
}
- if (!IS_ERR(nop->clk) && pdata && pdata->clk_rate) {
- err = clk_set_rate(nop->clk, pdata->clk_rate);
+ if (!IS_ERR(nop->clk) && nop->clk_rate) {
+ err = clk_set_rate(nop->clk, nop->clk_rate);
if (err) {
dev_err(&pdev->dev, "Error setting clock rate\n");
return err;
@@ -236,12 +248,20 @@ static int nop_usb_xceiv_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id nop_xceiv_dt_ids[] = {
+ { .compatible = "usb-nop-xceiv" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
+
static struct platform_driver nop_usb_xceiv_driver = {
.probe = nop_usb_xceiv_probe,
.remove = nop_usb_xceiv_remove,
.driver = {
.name = "nop_usb_xceiv",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(nop_xceiv_dt_ids),
},
};
--
1.7.4.1
--
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