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.
Cc: Felipe Balbi <[email protected]> Cc: Philipp Zabel <[email protected]> Signed-off-by: Vivek Gautam <[email protected]> --- drivers/usb/dwc3/dwc3-of-simple.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c index fe414e7a9c78..9116df649f0b 100644 --- a/drivers/usb/dwc3/dwc3-of-simple.c +++ b/drivers/usb/dwc3/dwc3-of-simple.c @@ -29,13 +29,39 @@ #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_array *resets; }; +static int dwc3_of_simple_reset_init(struct dwc3_of_simple *simple) +{ + struct device *dev = simple->dev; + int ret; + + simple->resets = of_reset_control_array_get_exclusive(dev->of_node); + if (IS_ERR(simple->resets)) { + ret = PTR_ERR(simple->resets); + if (ret == -ENOENT) + /* not all controllers required resets */ + return 0; + dev_err(dev, "failed to get device resets\n"); + return ret; + } + + ret = reset_control_array_deassert(simple->resets); + if (ret) { + reset_control_array_put(simple->resets); + return ret; + } + + return 0; +} + static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count) { struct device *dev = simple->dev; @@ -100,6 +126,10 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) if (ret) return ret; + ret = dwc3_of_simple_reset_init(simple); + if (ret) + return ret; + ret = of_platform_populate(np, NULL, NULL, dev); if (ret) { for (i = 0; i < simple->num_clocks; i++) { @@ -107,6 +137,9 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) clk_put(simple->clks[i]); } + reset_control_array_assert(simple->resets); + reset_control_array_put(simple->resets); + return ret; } @@ -128,6 +161,9 @@ static int dwc3_of_simple_remove(struct platform_device *pdev) clk_put(simple->clks[i]); } + reset_control_array_assert(simple->resets); + reset_control_array_put(simple->resets); + of_platform_depopulate(dev); pm_runtime_put_sync(dev); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
