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

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Message-ID: <CAFp+6iFekTwuaznQq9bkFVrDxz25xD-2SmLV5BBB9akDD8HP6A@mail.gmail.com>
Date:   Thu, 16 Mar 2017 09:18:40 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/2] reset: Add API to count number of reset available
 with device

Hi Philipp,


On Wed, Mar 15, 2017 at 4:10 PM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> 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@...eaurora.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@...gutronix.de>
>> > Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.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.

Sure, will change this. I can prepare a patch for tegra/pmc.c as well
using this.

Best regards
Vivek

>
> regards
> Philipp
>
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