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Commit a08ae2b2 authored by Hemant Kumar's avatar Hemant Kumar
Browse files

usb: xhci-msm-hsic: Add support for GDSC regulator 



Global Distributed Switch Controller (GDSC) regulator is
needed to turn on and off HSIC controller.

Change-Id: Ibe73038f2d903a09d77e38bfee0da1b3eb78d92d
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent a9f87265

Documentation/devicetree/bindings/usb/msm-xhci-hsic.txt

+2 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ Required properties : 
	"pwr_event_irq" : Interrupt generated by HSIC controller due to

	change in power state.

- <supply-name>-supply: handle to the regulator device tree node

  Required "supply-name" is "hsic-vdd-dig".

  Required "supply-name" are "hsic-vdd-dig" and "hsic-gdsc-supply".

- hsic,<gpio-name>-gpio : handle to the GPIO node, see "gpios property"

  in Documentation/devicetree/bindings/gpio/gpio.txt.

  Required "gpio-name" are "strobe" and "data".
@@ -25,6 +25,7 @@ Example MSM HSIC XHCI controller device node : 
			   <0 29 0>;

		interrupt-names = "core_irq", "pwr_event_irq";

		hsic-vdd-dig-supply = <&pma8084_s2_corner>;

		hsic-gdsc-supply = <&gdsc_usb_hsic>;

		hsic,strobe-gpio = <&msmgpio 134 0x00>;

		hsic,data-gpio = <&msmgpio 135 0x00>;

		qcom,vdd-voltage-level = <1 5 7>;

drivers/usb/host/xhci-msm-hsic.c

+35 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ struct mxhci_hsic_hcd { 
	struct clk		*cal_clk;



	struct regulator	*hsic_vddcx;

	struct regulator	*hsic_gdsc;



	struct wakeup_source	ws;
@@ -255,6 +256,33 @@ out: 
	return ret;

}



/*

 * Config Global Distributed Switch Controller (GDSC)

 * to turn on/off HSIC controller

 */

static int mxhci_msm_config_gdsc(struct mxhci_hsic_hcd *mxhci, int on)

{

	int ret = 0;



	if (!mxhci->hsic_gdsc) {

		mxhci->hsic_gdsc = devm_regulator_get(mxhci->dev, "hsic-gdsc");

			if (IS_ERR(mxhci->hsic_gdsc))

				return PTR_ERR(mxhci->hsic_gdsc);

	}



	if (on) {

		ret = regulator_enable(mxhci->hsic_gdsc);

		if (ret) {

			dev_err(mxhci->dev, "unable to enable hsic gdsc\n");

			return ret;

		}

	} else {

		regulator_disable(mxhci->hsic_gdsc);

	}



	return 0;

}



static int mxhci_hsic_config_gpios(struct mxhci_hsic_hcd *mxhci)

{

	int rc = 0;
@@ -655,6 +683,12 @@ static int mxhci_hsic_probe(struct platform_device *pdev) 
		goto put_hcd;

	}



	ret = mxhci_msm_config_gdsc(mxhci, 1);

	if (ret) {

		dev_err(&pdev->dev, "unable to configure hsic gdsc\n");

		goto put_hcd;

	}



	ret = mxhci_hsic_init_clocks(mxhci, 1);

	if (ret) {

		dev_err(&pdev->dev, "unable to initialize clocks\n");
@@ -808,6 +842,7 @@ static int mxhci_hsic_remove(struct platform_device *pdev) 
	device_init_wakeup(&pdev->dev, 0);

	mxhci_hsic_init_vddcx(mxhci, 0);

	mxhci_hsic_init_clocks(mxhci, 0);

	mxhci_msm_config_gdsc(mxhci, 0);

	wakeup_source_trash(&mxhci->ws);

	usb_put_hcd(hcd);