linux-kernel - Re: [PATCH v2 4/4] ARM: PWM: add allwinner sun8i pwm support.

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Date:   Fri, 18 May 2018 10:15:22 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Hao Zhang <hao5781286@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>, robh+dt@...nel.org,
        Mark Rutland <mark.rutland@....com>, linux@...linux.org.uk,
        Chen-Yu Tsai <wens@...e.org>,
        Claudiu Beznea <Claudiu.Beznea@...rochip.com>,
        linux-gpio@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>, linux-pwm@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 4/4] ARM: PWM: add allwinner sun8i pwm support.

On Thu, May 17, 2018 at 10:48:58PM +0800, Hao Zhang wrote:
> 2018-05-15 19:17 GMT+08:00 Maxime Ripard <maxime.ripard@...tlin.com>:
> > Hi,
> >
> > On Mon, May 14, 2018 at 10:45:44PM +0800, Hao Zhang wrote:
> >> 2018-02-26 17:00 GMT+08:00 Maxime Ripard <maxime.ripard@...tlin.com>:
> >> > Thanks for respinning this serie. It looks mostly good, but you still
> >> > have a quite significant number of checkpatch (--strict) warnings that
> >> > you should address.
> >>
> >> Thanks for reviews :) ,i'm sorry for that, it will be fixed next
> >> time.  and, besides, in what situation were the checkpatch warning
> >> can be ignore？
> >
> > The only one that can be reasonably be ignored is the long line
> > warning, and only if complying to the limit would make it less easy to
> > understand.
> >
> >> >
> >> > On Sun, Feb 25, 2018 at 09:53:08PM +0800, hao_zhang wrote:
> >> >> +#define CAPTURE_IRQ_ENABLE_REG       0x0010
> >> >> +#define CFIE(ch)     BIT(ch << 1 + 1)
> >> >> +#define CRIE(ch)     BIT(ch << 1)
> >> >
> >> > You should also put your argument between parentheses here (and in all
> >> > your other macros).
> >>
> >> Do you mean like this ?
> >> #define CFIE(ch)     BIT((ch) << 1 + 1)
> >> #define CRIE(ch)     BIT((ch) << 1)
> >
> > Yep, exactly. Otherwise, if you do something like CRIE(1 + 1), the
> > result will be BIT(1 + 1 << 1), which will expand to 3, instead of 4.
> >
> > Also, CFIE looks a bit weird here, is it the offset that is
> > incremented, or the value? You should probably have parentheses to
> > make it explicit.
> 
> The vallue,
> BIT(((ch) << 1) + 1) It seem not very nice...
> 
> uhmm...
> In CAPTURE_IRQ_ENABLE_REG odd number is CFIE, even number is CRIE
> each channel has one CFIE and CRIE.
> 
> we can also describe like this:
> #define CFIE(ch)     BIT((ch) * 2 + 1)
> #define CRIE(ch)     BIT((ch) * 2)

That works for me.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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