Commit 0eba3879 authored by Roger Quadros's avatar Roger Quadros Committed by Felipe Balbi
Browse files

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



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

Signed-off-by: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 90f4232f

Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt

0 → 100644
+34 −0
Original line number Diff line number Diff line 
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.

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

+27 −8
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 
#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;
@@ -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),

	},

};