Hi Christophe,
On Sat, 2 Mar 2024 at 21:20, Christophe JAILLET
<christophe.jaillet@xxxxxxxxxx> wrote:
>
> Le 01/03/2024 à 20:38, Anand Moon a écrit :
> > Use devm_regulator_bulk_get_enable() instead of open coded
> > 'devm_regulator_get(), regulator_enable(), regulator_disable().
> >
> > Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
> > ---
> > drivers/usb/dwc3/dwc3-exynos.c | 49 +++-------------------------------
> > 1 file changed, 4 insertions(+), 45 deletions(-)
> >
> > diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
> > index 5d365ca51771..7c77f3c69825 100644
> > --- a/drivers/usb/dwc3/dwc3-exynos.c
> > +++ b/drivers/usb/dwc3/dwc3-exynos.c
> > @@ -32,9 +32,6 @@ struct dwc3_exynos {
> > struct clk *clks[DWC3_EXYNOS_MAX_CLOCKS];
> > int num_clks;
> > int suspend_clk_idx;
> > -
> > - struct regulator *vdd33;
> > - struct regulator *vdd10;
> > };
> >
> > static int dwc3_exynos_probe(struct platform_device *pdev)
> > @@ -44,6 +41,7 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
> > struct device_node *node = dev->of_node;
> > const struct dwc3_exynos_driverdata *driver_data;
> > int i, ret;
> > + static const char * const regulators[] = { "vdd33", "vdd10" };
> >
> > exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
> > if (!exynos)
> > @@ -78,27 +76,9 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
> > if (exynos->suspend_clk_idx >= 0)
> > clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);
> >
> > - exynos->vdd33 = devm_regulator_get(dev, "vdd33");
> > - if (IS_ERR(exynos->vdd33)) {
> > - ret = PTR_ERR(exynos->vdd33);
> > - goto vdd33_err;
> > - }
> > - ret = regulator_enable(exynos->vdd33);
> > - if (ret) {
> > - dev_err(dev, "Failed to enable VDD33 supply\n");
> > - goto vdd33_err;
> > - }
> > -
> > - exynos->vdd10 = devm_regulator_get(dev, "vdd10");
> > - if (IS_ERR(exynos->vdd10)) {
> > - ret = PTR_ERR(exynos->vdd10);
> > - goto vdd10_err;
> > - }
> > - ret = regulator_enable(exynos->vdd10);
> > - if (ret) {
> > - dev_err(dev, "Failed to enable VDD10 supply\n");
> > - goto vdd10_err;
> > - }
> > + ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulators), regulators);
> > + if (ret)
> > + return dev_err_probe(dev, ret, "Failed to enable regulators\n");
> >
> > if (node) {
> > ret = of_platform_populate(node, NULL, NULL, dev);
> > @@ -115,10 +95,6 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
> > return 0;
> >
> > populate_err:
> > - regulator_disable(exynos->vdd10);
> > -vdd10_err:
> > - regulator_disable(exynos->vdd33);
> > -vdd33_err:
> > for (i = exynos->num_clks - 1; i >= 0; i--)
> > clk_disable_unprepare(exynos->clks[i]);
> >
> > @@ -140,9 +116,6 @@ static void dwc3_exynos_remove(struct platform_device *pdev)
> >
> > if (exynos->suspend_clk_idx >= 0)
> > clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
> > -
> > - regulator_disable(exynos->vdd33);
> > - regulator_disable(exynos->vdd10);
> > }
> >
> > static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
> > @@ -196,9 +169,6 @@ static int dwc3_exynos_suspend(struct device *dev)
> > for (i = exynos->num_clks - 1; i >= 0; i--)
> > clk_disable_unprepare(exynos->clks[i]);
> >
> > - regulator_disable(exynos->vdd33);
> > - regulator_disable(exynos->vdd10);
>
> Hi,
>
> Same here, I don't think that removing regulator_[en|dis]able from the
> suspend and resume function is correct.
>
> The goal is to stop some hardware when the system is suspended, in order
> to save some power.
Ok,
>
> Why did you removed it?
As per the description of the function devm_regulator_bulk_get_enable
* This helper function allows drivers to get several regulator
* consumers in one operation with management, the regulators will
* automatically be freed when the device is unbound. If any of the
* regulators cannot be acquired then any regulators that were
* allocated will be freed before returning to the caller.
[0] https://elixir.bootlin.com/linux/latest/source/drivers/regulator/devres.c#L330
I have tested with rtc suspend resume and did not find any issue with
this.patch.
>
> CJ
>
Thanks
-Anand
