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Date:   Thu, 19 Mar 2020 13:10:26 +0100
From:   Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= 
        <u.kleine-koenig@pengutronix.de>
To:     Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
        devicetree@vger.kernel.org, linux-pwm@vger.kernel.org,
        Paul Barker <pbarker@konsulko.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
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        Igor Opaniuk <igor.opaniuk@toradex.com>,
        Philippe Schenker <philippe.schenker@toradex.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Chen-Yu Tsai <wens@csie.org>,
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        Florian Fainelli <f.fainelli@gmail.com>,
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        Kevin Hilman <khilman@baylibre.com>,
        Ludovic Desroches <ludovic.desroches@microchip.com>,
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Subject: Re: [RFC PATCH 1/7] pwm: rename the PWM_POLARITY_INVERSED enum
Message-ID: <20200319121026.3rzcxdknfyhtkryi@pengutronix.de>
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Hello,

[dropping Tony Prisk <linux@prisktech.co.nz> from recipients]

On Thu, Mar 19, 2020 at 01:40:28PM +0200, Oleksandr Suvorov wrote:
> Thierry, I see the PWM core converts the bit field "third cell" into
> the polarity variable.
> Now I probably understand your sight and agree that we shouldn't give
> the same names to bits in bitfield (dts) and values of a variable.
> 
> But there are lots of useless "0" values of third cell of "pwms"
> option in dts files.
> 
> I see 2 ways now:
> - just remove all "0" "third cell" from "pwms" options in dts files. I
> see this "0" confuses some people.

Then you have to overwrite pwm-cells of the provider. If there are two
PWMs used from the same provider and only one is inverted this won't
work. (Not entirely sure I understood your suggestion.) So I don't like
this suggestion.

And also in my eyes this isn't clearer, just more complicated to use.

> - convert pwm_state.polarity into pwm_state.flags and use bitfield
>   directly from dtb.
>   It simplifies the parsing logic and makes adding new flags easier.

*shrug*, I don't care much.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |