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Commit 06c47e62 authored by Vivek Gautam's avatar Vivek Gautam Committed by Felipe Balbi
Browse files

usb: dwc3: of-simple: Add support to get resets for the device 



Add support to get a list of resets available for the device.
These resets must be kept de-asserted until the device is
in use.

Signed-off-by: default avatarVivek Gautam <vivek.gautam@codeaurora.org>
[p.zabel@pengutronix.de: switch to hidden reset control array]
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent d6d9c2a3

drivers/usb/dwc3/dwc3-of-simple.c

+25 −2
Original line number Diff line number Diff line
@@ -28,11 +28,13 @@ 
#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/pm_runtime.h>

#include <linux/reset.h>



struct dwc3_of_simple {

	struct device		*dev;

	struct clk		**clks;

	int			num_clocks;

	struct reset_control	*resets;

};



static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
@@ -95,10 +97,21 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) 
	platform_set_drvdata(pdev, simple);

	simple->dev = dev;



	simple->resets = of_reset_control_array_get_optional_exclusive(np);

	if (IS_ERR(simple->resets)) {

		ret = PTR_ERR(simple->resets);

		dev_err(dev, "failed to get device resets, err=%d\n", ret);

		return ret;

	}



	ret = reset_control_deassert(simple->resets);

	if (ret)

		goto err_resetc_put;



	ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,

						"clocks", "#clock-cells"));

	if (ret)

		return ret;

		goto err_resetc_assert;



	ret = of_platform_populate(np, NULL, NULL, dev);

	if (ret) {
@@ -107,7 +120,7 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) 
			clk_put(simple->clks[i]);

		}



		return ret;

		goto err_resetc_assert;

	}



	pm_runtime_set_active(dev);
@@ -115,6 +128,13 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) 
	pm_runtime_get_sync(dev);



	return 0;



err_resetc_assert:

	reset_control_assert(simple->resets);



err_resetc_put:

	reset_control_put(simple->resets);

	return ret;

}



static int dwc3_of_simple_remove(struct platform_device *pdev)
@@ -130,6 +150,9 @@ static int dwc3_of_simple_remove(struct platform_device *pdev) 
		clk_put(simple->clks[i]);

	}



	reset_control_assert(simple->resets);

	reset_control_put(simple->resets);



	pm_runtime_put_sync(dev);

	pm_runtime_disable(dev);