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usb: dwc3: of-simple: Add support to get resets for the device 

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>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Vivek Gautam 2017-10-19 13:47:43 +02:00 committed by Felipe Balbi
parent d6d9c2a3ea
commit 06c47e6286
1 changed files with 25 additions and 2 deletions
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27
drivers/usb/dwc3/dwc3-of-simple.c
View File

@ -28,11 +28,13 @@
#include <linux/of.h> #include <linux/of.h>
#include <linux/of_platform.h> #include <linux/of_platform.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
#include <linux/reset.h>
struct dwc3_of_simple { struct dwc3_of_simple {
struct device *dev; struct device *dev;
struct clk **clks; struct clk **clks;
int num_clocks; int num_clocks;
struct reset_control *resets;
}; };
static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count) 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); platform_set_drvdata(pdev, simple);
simple->dev = dev; 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, ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
"clocks", "#clock-cells")); "clocks", "#clock-cells"));
if (ret) if (ret)
return ret; goto err_resetc_assert;
ret = of_platform_populate(np, NULL, NULL, dev); ret = of_platform_populate(np, NULL, NULL, dev);
if (ret) { if (ret) {
@ -107,7 +120,7 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
clk_put(simple->clks[i]); clk_put(simple->clks[i]);
} }
return ret; goto err_resetc_assert;
} }
pm_runtime_set_active(dev); pm_runtime_set_active(dev);
@ -115,6 +128,13 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
pm_runtime_get_sync(dev); pm_runtime_get_sync(dev);
return 0; 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) 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]); clk_put(simple->clks[i]);
} }
reset_control_assert(simple->resets);
reset_control_put(simple->resets);
pm_runtime_put_sync(dev); pm_runtime_put_sync(dev);
pm_runtime_disable(dev); pm_runtime_disable(dev);