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: Vivek Gautam <vivek.gautam@codeaurora.org> [p.zabel@pengutronix.de: switch to hidden reset control array] Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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@ -28,11 +28,13 @@
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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struct dwc3_of_simple {
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struct device *dev;
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struct clk **clks;
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int num_clocks;
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struct reset_control *resets;
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};
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static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
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@ -95,10 +97,21 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, simple);
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simple->dev = dev;
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simple->resets = of_reset_control_array_get_optional_exclusive(np);
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if (IS_ERR(simple->resets)) {
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ret = PTR_ERR(simple->resets);
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dev_err(dev, "failed to get device resets, err=%d\n", ret);
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return ret;
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}
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ret = reset_control_deassert(simple->resets);
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if (ret)
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goto err_resetc_put;
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ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
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"clocks", "#clock-cells"));
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if (ret)
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return ret;
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goto err_resetc_assert;
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ret = of_platform_populate(np, NULL, NULL, dev);
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if (ret) {
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@ -107,7 +120,7 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
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clk_put(simple->clks[i]);
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}
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return ret;
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goto err_resetc_assert;
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}
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pm_runtime_set_active(dev);
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@ -115,6 +128,13 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
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pm_runtime_get_sync(dev);
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return 0;
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err_resetc_assert:
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reset_control_assert(simple->resets);
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err_resetc_put:
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reset_control_put(simple->resets);
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return ret;
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}
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static int dwc3_of_simple_remove(struct platform_device *pdev)
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@ -130,6 +150,9 @@ static int dwc3_of_simple_remove(struct platform_device *pdev)
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clk_put(simple->clks[i]);
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}
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reset_control_assert(simple->resets);
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reset_control_put(simple->resets);
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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