Re: [PATCH 1/2] reset: Add API to count number of reset available with device

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From	Philipp Zabel <p.zabel@pengutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/2] reset: Add API to count number of reset available with device
Date	Wed, 15 Mar 2017 11:50:02 +0100
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Hi Vivek,

On Fri, 2017-03-10 at 20:10 +0530, Vivek Gautam wrote:
> Hi Philipp,
> 
> 
> On Wed, Feb 22, 2017 at 10:54 AM, Vivek Gautam
> <vivek.gautam@codeaurora.org> wrote:
> > Count number of reset phandles available with the device node
> > to know the resets a given device has.
> >
> > Cc: Philipp Zabel <p.zabel@pengutronix.de>
> > Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
> > ---
> 
> Any thoughts on this change?
> A small addition that seems useful.

Sorry I missed this one earlier.

> >
> > Based on torvald's master branch.
> >
> >  include/linux/reset.h | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> >
> > diff --git a/include/linux/reset.h b/include/linux/reset.h
> > index 5daff15722d3..88f63a640153 100644
> > --- a/include/linux/reset.h
> > +++ b/include/linux/reset.h
> > @@ -2,6 +2,7 @@
> >  #define _LINUX_RESET_H_
> >
> >  #include <linux/device.h>
> > +#include <linux/of.h>
> >
> >  struct reset_control;
> >
> > @@ -234,6 +235,21 @@ static inline struct reset_control *of_reset_control_get_shared_by_index(
> >  }
> >
> >  /**
> > + * of_reset_control_get_count - Count number of resets available with a device
> > + * @node: device to be reset by the controller
> > + */
> > +static inline unsigned int of_reset_control_get_count(struct device_node *node)
> > +{
> > +       int count;
> > +
> > +       count = of_count_phandle_with_args(node, "resets", "#reset-cells");
> > +       if (count < 0)
> > +               return 0;

Please don't silently ignore errors. gpiod_count doesn't ignore errors
either. tegra_powergate_of_resets in drivers/soc/tegra/pmc.c open codes
this, too. This should be changed so it can be used there, too.

regards
Philipp

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Re: [PATCH 1/2] reset: Add API to count number of reset available  with device Philipp Zabel <p.zabel@pengutronix.de> - 2017-03-15 11:50 +0100
  Re: [PATCH 1/2] reset: Add API to count number of reset available  with device Vivek Gautam <vivek.gautam@codeaurora.org> - 2017-03-16 04:50 +0100

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