linux-kernel - Re: [PATCH 09/15] Platform: OLPC: add a regulator for the DCON

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Message-ID: <CAHp75VcwjoNT76F0qn=2CjETRCdNjX2P-GRLWT4pqJ-9Ch6+ZQ@mail.gmail.com>
Date:   Fri, 19 Oct 2018 16:39:35 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        quozl@...top.org, Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eric Miao <eric.y.miao@...il.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Daniel Mack <daniel@...que.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        linux-spi <linux-spi@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        devel@...verdev.osuosl.org, Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 09/15] Platform: OLPC: add a regulator for the DCON

On Wed, Oct 10, 2018 at 8:23 PM Lubomir Rintel <lkundrak@...sk> wrote:
>
> All OLPC ECs are able to turn the power to the DCON on an off. Use the
> regulator framework to expose the functionality.

> +static int olpc_ec_set_dcon_power(struct olpc_ec_priv *ec, bool state)
> +{
> +       unsigned char ec_byte = state;
> +       int ret;
> +
> +       if (ec->dcon_enabled == state)
> +               return 0;
> +

> +       ret = olpc_ec_cmd(EC_DCON_POWER_MODE, &ec_byte, 1, NULL, 0);
> +       if (ret == 0)
> +               ec->dcon_enabled = state;
> +
> +       return ret;

I would prefer to see usual pattern, i.e.

if (ret)
 return ret;

...
return 0;

This comment applies to entire series. (Yes, you might address an old
code in a separate patch to be on consistent side)

> +}

> +       return olpc_ec_set_dcon_power(ec, 1);

defined as boolean, supplied an int. Not good.

> +       return olpc_ec_set_dcon_power(ec, 0);

Ditto.

> +static int dcon_regulator_is_enabled(struct regulator_dev *rdev)
> +       return ec->dcon_enabled;

Ditto.

-- 
With Best Regards,
Andy Shevchenko