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usb: phy: nop: Add device tree support and binding information

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The PHY clock, clock rate, VCC regulator and RESET regulator
can now be provided via device tree.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Roger Quadros 2013-03-12 13:24:25 +02:00 committed by Felipe Balbi
parent 90f4232f31
commit 0eba387973
2 changed files with 61 additions and 8 deletions
Documentation/devicetree/bindings/usb
usb-nop-xceiv.txt
drivers/usb/otg
nop-usb-xceiv.c

34
Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt Normal file

@ -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.

35
drivers/usb/otg/nop-usb-xceiv.c

@ -34,13 +34,14 @@
#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;
};
static struct platform_device *pd;
@ -140,10 +141,12 @@ 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;
int err;
u32 clk_rate = 0;
nop = devm_kzalloc(&pdev->dev, sizeof(*nop), GFP_KERNEL);
if (!nop)
@ -154,8 +157,16 @@ 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;
if (of_property_read_u32(node, "clock-frequency", &clk_rate))
clk_rate = 0;
} else if (pdata) {
type = pdata->type;
clk_rate = pdata->clk_rate;
}
nop->clk = devm_clk_get(&pdev->dev, "main_clk");
if (IS_ERR(nop->clk)) {
@ -163,8 +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) && clk_rate) {
err = clk_set_rate(nop->clk, clk_rate);
if (err) {
dev_err(&pdev->dev, "Error setting clock rate\n");
return err;
@ -237,12 +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),
},
};