linux-kernel - Re: [PATCH 1/1] MFD: Add U300 AB3100 core support v2

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Date:	Tue, 19 May 2009 18:23:49 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Mike Rapoport <mike@...pulab.co.il>
Cc:	linux-kernel@...r.kernel.org, sameo@...ux.intel.com,
	linux-i2c@...r.kernel.org,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: Re: [PATCH 1/1] MFD: Add U300 AB3100 core support v2

Hm I shouldn't been so trigger-happy as to send v3 out so soon... :-/

Thanks for you quick review Mike!

2009/5/19 Mike Rapoport <mike@...pulab.co.il>:

>> +     /* Set a pointer back to the container in device data */
>> +     for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
>> +             platform_set_drvdata(ab3100_platform_devs[i], ab3100_local);
>> +
>> +     /* Register the platform devices */
>> +     platform_add_devices(ab3100_platform_devs,
>> +                          ARRAY_SIZE(ab3100_platform_devs));
>
> If you register sub-devices this way, they won't appear as ab3100 children.

I'll set the parent in the first loop then (will test that this works) because I
really like that device table. (Similar to how the board setup does things.)

> Besides, setting the sub-devices drvdata to point to the master device makes it
> impossible for sub-device drivers to use this field for their needs.

Not really... It's just a pointer back to the AB3100 parent that can
be discarded
after copying it to a local driver struct. So the driver can actually:

foo_probe(platform_device *pdev) {
  foo = kmalloc(...);
  foo->ab_pointer = platform_get_drvdata(pdev);
  ...
  platform_set_drvdata(pdev, foo);
}

I could use platform_device_add_data() instead but that will start
kmalloc():ing and such...

>> +/*
>> + * This struct is PRIVATE and devices using it should NOT
>> + * access ANY fields. It is used as a token for calling the
>> + * AB3100 functions.
>> + */
>
> If the struct is private, probably it should be placed rather in the ".c" file?

>From one point of view, yes, but from another point of view it feels bad to
pass around a (void *) as token for ab3100 operations. This is loosely
modeled on how wm8350 does it, so shouldn't be too controversial I think.

Yours,
Linus Walleij
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