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 06:12:54 +0000
From:   Ryan Chen <ryan_chen@...eedtech.com>
To:     Ryan Chen <ryan_chen@...eedtech.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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

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 ?

Best regards,
Ryan