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usb: dwc3: of-simple: add support for shared and pulsed reset lines

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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@googlemail.com>
Tested-by: Yixun Lan <yixun.lan@amlogic.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Martin Blumenstingl 2018-02-11 22:15:16 +01:00 committed by Felipe Balbi
parent a5d411962c
commit ff0a632f08
1 changed files with 17 additions and 6 deletions
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23
drivers/usb/dwc3/dwc3-of-simple.c
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@ -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);
@ -145,7 +154,9 @@ static int dwc3_of_simple_remove(struct platform_device *pdev)
}
simple->num_clocks = 0;
reset_control_assert(simple->resets);
if (!simple->pulse_resets)
reset_control_assert(simple->resets);
reset_control_put(simple->resets);
pm_runtime_put_sync(dev);