linux-kernel - Re: [RFC 09/11] tools: gpio: Add new hardware clock type

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Message-ID: <20210731061617.GA12414@sol>
Date:   Sat, 31 Jul 2021 14:16:17 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     Dipen Patel <dipenp@...dia.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [RFC 09/11] tools: gpio: Add new hardware clock type

On Thu, Jul 29, 2021 at 08:17:22PM -0700, Dipen Patel wrote:
> 
> On 6/27/21 4:36 AM, Linus Walleij wrote:
> > On Sat, Jun 26, 2021 at 1:48 AM Dipen Patel <dipenp@...dia.com> wrote:
> >
> >> gpiolib-cdev is extended to support hardware clock type, this
> >> patch reflects that fact.
> >>
> >> Signed-off-by: Dipen Patel <dipenp@...dia.com>
> > (...)
> >>                 case 'w':
> >>                         config.flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME;
> >>                         break;
> >> +               case 't':
> >> +                       config.flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_HARDWARE;
> >> +                       break;
> > After the checking of the command line options we need a small sanity
> > check so we don't try to enable both realtime and hardware clock
> > at the same time, we will only be able to request one of them.
> 
> This will any way fail at gpiolib-cdev layer. Do we want to add it here
> 
> as well?
> 

I can't speak for Linus, but I'm fine with it as is as it allows the tool
to be used to exercise the sanity check in the kernel.

Cheers,
Kent.