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 <balbi@xxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
---
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 a9bac09d3750..463b744d6688 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -29,11 +29,13 @@
#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_array *resets;
};
static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
@@ -96,9 +98,20 @@ 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_array_deassert(simple->resets);
+ if (ret)
+ goto err_resetc_put;
+
ret = dwc3_of_simple_clk_init(simple, of_clk_get_parent_count(np));
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_array_assert(simple->resets);
+
+err_resetc_put:
+ reset_control_array_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_array_assert(simple->resets);
+ reset_control_array_put(simple->resets);
+
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
--
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a Linux Foundation Collaborative Project
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