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

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Date:   Sun, 2 Jul 2017 21:51:44 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Wolfram Sang <wsa@...-dreams.de>
CC:     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 30/06/17 22:56, Andy Shevchenko wrote:
> 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.

We could probably go with an approach of making the device properties 
the default which would suit the new style and leave the platform_data 
to override things if it is present.

If/when the older platforms go away we can drop struct 
i2c_pca9564_pf_platform_data.