linux-kernel - Re: [PATCH 5/6] i2c: pca-platform: use device_property_read

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Message-ID: <CAHp75Ve1daNFe4PLAMpqMudE9d+Ss2JpeZ=Sy5x5ij99gAVs_w@mail.gmail.com>
Date:   Fri, 30 Jun 2017 13:56:06 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Chris Packham <chris.packham@...iedtelesis.co.nz>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Linux-SH <linux-sh@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] i2c: pca-platform: use device_property_read_u32

On Fri, Jun 30, 2017 at 12:03 PM, Wolfram Sang <wsa@...-dreams.de> wrote:
>
>> > -               i2c->algo_data.i2c_clock = 59000;
>> > +               ret = device_property_read_u32(&pdev->dev, "clock-frequency",
>> > +                                              &i2c->algo_data.i2c_clock);
>> > +               if (ret)
>> > +                       i2c->algo_data.i2c_clock = 59000;
>>
>> My idea is to get rid of legacy platform data completely.
>> That's why I suggested device_* in the first place.
>>
>> In similar way like you did with GPIO lookup table, you may use
>> PROPERTY_ENTRY*() macros in the board files.
>>
>> Does it make sense?
>
> Frankly, I am not a big fan of converting board files if we cannot test
> the changes.

So, if no one is using that old boards, should we really take care
more than just compile test?

P.S. Legacy platform data makes a burden of development nowadays.
Built-in device properties API (as a part of Unified Device
Properties) is exactly for getting rid of legacy stuff and make things
much cleaner.

-- 
With Best Regards,
Andy Shevchenko