netdev - Re: [RFC v8 net-next 06/16] pinctrl: microchip-sgpio: add ability to be used in a non-mmio configuration

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Date:   Mon, 9 May 2022 10:44:42 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        netdev@...r.kernel.org, Terry Bowman <terry.bowman@....com>,
        Wolfram Sang <wsa@...nel.org>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>, UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [RFC v8 net-next 06/16] pinctrl: microchip-sgpio: add ability to
 be used in a non-mmio configuration

On Sun, May 8, 2022 at 8:53 PM Colin Foster
<colin.foster@...advantage.com> wrote:
>
> There are a few Ocelot chips that can contain SGPIO logic, but can be
> controlled externally. Specifically the VSC7511, 7512, 7513, and 7514. In
> the externally controlled configurations these registers are not
> memory-mapped.
>
> Add support for these non-memory-mapped configurations.

...

> -       regs = devm_platform_ioremap_resource(pdev, 0);
> -       if (IS_ERR(regs))
> -               return PTR_ERR(regs);
> +       regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
> +       if (IS_ERR(regs)) {
> +               /*
> +                * Fall back to using IORESOURCE_REG, which is possible in an
> +                * MFD configuration
> +                */
> +               res = platform_get_resource(pdev, IORESOURCE_REG, 0);
> +               if (!res) {
> +                       dev_err(dev, "Failed to get resource\n");
> +                       return -ENODEV;
> +               }
> +
> +               priv->regs = ocelot_init_regmap_from_resource(dev, res);
> +       } else {
> +               priv->regs = devm_regmap_init_mmio(dev, regs, &regmap_config);
> +       }
>
> -       priv->regs = devm_regmap_init_mmio(dev, regs, &regmap_config);
>         if (IS_ERR(priv->regs))
>                 return PTR_ERR(priv->regs);

This looks like repetition of something you have done in a few
previous patches. Can you avoid code duplication by introducing a
corresponding helper function?

-- 
With Best Regards,
Andy Shevchenko