On Thu, Apr 10, 2014 at 02:25:46PM +0200, Boris BREZILLON wrote: > The A31 SoC define a reset line for the R_PIO block which needs to be > deasserted for the pin controller to be usable. > > Try to retrieve a reset line and deassert if one was found. > > Signed-off-by: Boris BREZILLON <boris.brezil...@free-electrons.com> > --- > drivers/pinctrl/pinctrl-sunxi.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/pinctrl/pinctrl-sunxi.c b/drivers/pinctrl/pinctrl-sunxi.c > index ee62027..b752495 100644 > --- a/drivers/pinctrl/pinctrl-sunxi.c > +++ b/drivers/pinctrl/pinctrl-sunxi.c > @@ -26,6 +26,7 @@ > #include <linux/pinctrl/pinconf-generic.h> > #include <linux/pinctrl/pinmux.h> > #include <linux/platform_device.h> > +#include <linux/reset.h> > #include <linux/slab.h> > > #include "core.h" > @@ -792,6 +793,7 @@ static int sunxi_pinctrl_probe(struct platform_device > *pdev) > const struct of_device_id *device; > struct pinctrl_pin_desc *pins; > struct sunxi_pinctrl *pctl; > + struct reset_control *rstc; > int i, ret, last_pin; > struct clk *clk; > > @@ -885,6 +887,13 @@ static int sunxi_pinctrl_probe(struct platform_device > *pdev) > > clk_prepare_enable(clk); > > + rstc = devm_reset_control_get(&pdev->dev, NULL);
You should use devm_reset_control_get_optional here.
> + if (!IS_ERR(rstc)) {
> + ret = reset_control_deassert(rstc);
> + if (ret)
> + goto gpiochip_error;
> + }
> +
It would be good to put back the device in reset if probe fails later
on.
Thanks
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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