Messages in this thread Patch in this message | | | From | Philipp Zabel <> | Subject | [PATCH v8] usb: dwc3: of-simple: Add support to get resets for the device | Date | Thu, 19 Oct 2017 13:47:43 +0200 |
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From: Vivek Gautam <vivek.gautam@codeaurora.org>
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> --- v7: Rebased onto git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git testing/next --- drivers/usb/dwc3/dwc3-of-simple.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c index e129c32780818..ceea1619f8aa3 100644 --- a/drivers/usb/dwc3/dwc3-of-simple.c +++ b/drivers/usb/dwc3/dwc3-of-simple.c @@ -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); -- 2.11.0
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