linux-kernel - Re: [PATCH v4 3/3] i2c: aspeed: support ast2600 i2c new register mode driver

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Date:   Tue, 14 Feb 2023 08:46:54 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ryan Chen <ryan_chen@...eedtech.com>, Jeremy Kerr <jk@...abs.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] i2c: aspeed: support ast2600 i2c new register mode
 driver

On 14/02/2023 07:12, Ryan Chen wrote:
> Hello Krzysztof,
>>
>>> On 02/02/2023 10:16, Ryan Chen wrote:
>>>>>>> +static struct platform_driver ast2600_i2c_global_driver = {
>>>>>> +       .probe  = ast2600_i2c_global_probe,
>>>>>> +       .driver = {
>>>>>> +               .name = KBUILD_MODNAME,
>>>>>> +               .of_match_table =
>> ast2600_i2c_global_of_match,
>>>>>> +       },
>>>>>> +};
>>>>>> +
>>>>>> +static int __init ast2600_i2c_global_init(void) {
>>>>>> +       return
>>>>>> +platform_driver_register(&ast2600_i2c_global_driver);
>>>>>> +}
>>>>>> +device_initcall(ast2600_i2c_global_init);
>>>>>
>>>>> Maybe module_platform_driver() instead?
>>>>
>>>> Due to i2c global is top of all i2c bus like the scu, it make sure
>>>> the driver is
>>> before the i2c bus driver probe.
>>>> It is needed use device_initcal function.
>>>
>>> No, we do not do such ordering. device links and proper resource
>>> sharing handle the order. This must be module_platform_driver()
>>> (assuming we do not drop entire submission).
>>
>>
>> If global driver use module_platform_driver, does i2c driver will latter the
>> global driver probe?
>> If yes, I think it will workable.
>>>
> I find a good way instead. 
> subsys_initcall(ast2600_i2c_global_init); is better ?

Not really, this is not a subsystem. This is module platform driver so
use it.

Best regards,
Krzysztof