linux-kernel - Re: [PATCH PoC 2/3] ACPI: platform: Refactor acpi_create_platform

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Date:   Fri, 19 Aug 2022 09:10:03 +0100
From:   John Garry <john.garry@...wei.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "ACPI Devel Maling List" <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH PoC 2/3] ACPI: platform: Refactor
 acpi_create_platform_device()

On 18/08/2022 20:41, Andy Shevchenko wrote:
> On Tue, Aug 16, 2022 at 2:33 PM John Garry <john.garry@...wei.com> wrote:
>>
>> There is commonality between acpi_create_platform_device() and
>> hisi_lpc_acpi_add_child(), in that it covers 2x main steps:
>> - Read resources for the acpi_device
>> - Create platform device
>>
>> Refactor acpi_create_platform_device() so that it may be reused by
>> hisi_lpc_acpi_add_child() to reduce duplication.
> 
> ...
> 
>> + * acpi_create_platform_device_ops - Create platform device for ACPI device node
> 
> Not sure I understand why _ops is a suffix for the function. I would
> expect _ops to be a data struct where the ->xlate() and perhaps other
> callbacks may be collected. It may be that I have missed that portion
> in the previous discussion.

ok, maybe I can put all the members into a struct, but I don't think 
that it improves the overall code too much.

> 
> ...
> 
>> +       if (name)
>> +               pdevinfo.name = name;
>> +       else
>> +               pdevinfo.name = dev_name(&adev->dev);
> 
>> +       pdevinfo.data = data;
>> +       pdevinfo.size_data = size_data;
> 
> It rather reminds me of platform device registration full with this
> device info. May be what you need is
> struct acpi_platfrom_device_info {
>    properties;
>    name;
>    id;
>    ->xlate();
>    ...
> };
> 
> ?
> 
> ...
> 
>> +struct platform_device *acpi_create_platform_device_ops(
>> +                               struct acpi_device *adev,
>> +                               const char *name,
>> +                               const struct property_entry *properties,
>> +                               void *data, size_t size_data,
>> +                               int (*xlat)(struct acpi_device *adev,
>> +                                           struct resource *res,
>> +                                           void *data, size_t size_data),
>> +                               int id);
> 
> ...because this looks  a bit too much from the amount of parameters
> point of view.
> 

ok, agreed.

But even if we improve this code, the hisi_lpc changes are quite large 
and unwieldly.

Thanks,
John