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Date:   Fri, 4 Jun 2021 10:18:08 +0800
From:   Steven Lee <steven_lee@aspeedtech.com>
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
CC:     Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
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        open list <linux-kernel@vger.kernel.org>,
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        Ryan Chen <ryan_chen@aspeedtech.com>,
        Billy Tsai <billy_tsai@aspeedtech.com>
Subject: Re: [PATCH v3 4/5] gpio: gpio-aspeed-sgpio: Add set_config function
Message-ID: <20210604021807.GB25112@aspeedtech.com>
References: <20210603101822.9645-1-steven_lee@aspeedtech.com>
 <20210603101822.9645-5-steven_lee@aspeedtech.com>
 <CAHp75VcPdUeK49w9qg9RuJY7ASMyFMEEi=cX1gnp=wM_QHDZ+w@mail.gmail.com>
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The 06/03/2021 19:07, Andy Shevchenko wrote:
> On Thu, Jun 3, 2021 at 1:20 PM Steven Lee <steven_lee@aspeedtech.com> wrote:
> >
> > AST SoC supports *retain pin state* function when wdt reset.
> > The patch adds set_config function for handling sgpio reset tolerance
> > register.
> 
> ...
> 
> > +static int aspeed_sgpio_set_config(struct gpio_chip *chip, unsigned int offset,
> > +                                  unsigned long config)
> > +{
> > +       unsigned long param = pinconf_to_config_param(config);
> > +       u32 arg = pinconf_to_config_argument(config);
> > +
> > +       if (param == PIN_CONFIG_PERSIST_STATE)
> > +               return aspeed_sgpio_reset_tolerance(chip, offset, arg);
> 
> > +       else
> 
> Redundant.
> 
> > +               return -EOPNOTSUPP;
> 
> IIRC we are using ENOTSUPP internally in the kernel. YEs, checkpatch
> warning may be ignored.
> 
> > +}
> 

I will modify the code as you suggested above, thanks.

> -- 
> With Best Regards,
> Andy Shevchenko