linux-kernel - Re: [PATCH v4 1/3] mfd: Add new mfd device TPS68470

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Message-ID: <CAHp75VeGqWNyDO644V+mje4sWsODDhyxRJ8cQ-HDV_e1hAUP3g@mail.gmail.com>
Date:   Tue, 25 Jul 2017 13:29:15 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     "Mani, Rajmohan" <rajmohan.mani@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH v4 1/3] mfd: Add new mfd device TPS68470

On Tue, Jul 25, 2017 at 12:10 PM, Lee Jones <lee.jones@...aro.org> wrote:
> On Fri, 21 Jul 2017, Mani, Rajmohan wrote:
>> > On Wed, 19 Jul 2017, Rajmohan Mani wrote:

>> > > + /* Force software reset */
>> > > + ret = regmap_write(regmap, TPS68470_REG_RESET,
>> > TPS68470_REG_RESET_MASK);
>> > > + if (ret < 0)
>> >
>> > Will 'if (!ret)' do?
>> >
>>
>> We intend to check error conditions and bail out. So, if (ret < 0) works for this.
>
> Yes, 'if (!ret)' does that too.

Did you mean

if (ret)
 return ret;

?

I briefly checked few ->read() and ->write() implementations and
didn't find any evidence of positive numbers that can be returned.
Documentation (kernel doc) doesn't shed a light on that. So, to me it
sounds unspecified.

So, for now (until documentation will be fixed) I would rely on
if (ret < 0)


-- 
With Best Regards,
Andy Shevchenko