Some SoCs (such as Amlogic Meson GXL for example) share the reset line
with other components (in case of the Meson GXL example there's a shared
reset line between the USB2 PHYs, USB3 PHYs and the dwc3 controller).
Additionally SoC implementations may prefer a reset pulse over level
resets.
For now this falls back to the old defaults, which are:
- reset lines are exclusive
- level resets are being used
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Tested-by: Yixun Lan <yixun.lan@xxxxxxxxxxx>
---
drivers/usb/dwc3/dwc3-of-simple.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index 7ae0eefc7cc7..d2e4928c8d62 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -27,6 +27,7 @@ struct dwc3_of_simple {
struct clk **clks;
int num_clocks;
struct reset_control *resets;
+ bool pulse_resets;
};
static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
@@ -83,6 +84,7 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
int ret;
int i;
+ bool shared_resets = false;
simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
if (!simple)
@@ -91,16 +93,22 @@ 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);
+ simple->resets = of_reset_control_array_get(np, shared_resets, true);
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;
+ if (simple->pulse_resets) {
+ ret = reset_control_reset(simple->resets);
+ if (ret)
+ goto err_resetc_put;
+ } else {
+ 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"));
@@ -124,7 +132,8 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
return 0;
err_resetc_assert:
- reset_control_assert(simple->resets);
+ if (!simple->pulse_resets)
+ reset_control_assert(simple->resets);
err_resetc_put:
reset_control_put(simple->resets);
@@ -144,7 +153,9 @@ static int dwc3_of_simple_remove(struct platform_device *pdev)
clk_put(simple->clks[i]);
}
- reset_control_assert(simple->resets);
+ if (!simple->pulse_resets)
+ reset_control_assert(simple->resets);
+
reset_control_put(simple->resets);
pm_runtime_put_sync(dev);
--
2.16.1
--
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