linux-kernel - Re: [PATCH v3 4/5] gpio: gpio-aspeed-sgpio: Add set

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Message-ID: <20210604021807.GB25112@aspeedtech.com>
Date:   Fri, 4 Jun 2021 10:18:08 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        "Hongweiz@....com" <Hongweiz@....com>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v3 4/5] gpio: gpio-aspeed-sgpio: Add set_config function

The 06/03/2021 19:07, Andy Shevchenko wrote:
> On Thu, Jun 3, 2021 at 1:20 PM Steven Lee <steven_lee@...eedtech.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