linux-kernel - Re: [PATCH 1/2] i2c: consider devices with of_match

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Message-ID: <20200826112326.GC1081@ninjato>
Date:   Wed, 26 Aug 2020 13:23:26 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] i2c: consider devices with of_match_table during i2c
 device probing

On Wed, Aug 26, 2020 at 01:54:26PM +0300, Andy Shevchenko wrote:
> On Wed, Aug 26, 2020 at 07:38:07PM +0900, Sergey Senozhatsky wrote:
> > On (20/08/26 19:24), Sergey Senozhatsky wrote:
> > > > But then the question is why we have this code in the ->probe() at all?
> > > > ->match() is run before probe by bus core, no?
> > > 
> > > That's a good question.
> > 
> > Everything seem to be working OK on my test board with this patch:
> 
> I'm okay with it, but I want to hear Wolfram about this.
> If it gets a green light to go, feel free to add
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Sergey,

Can you send a proper patch (with patch description) and me and Jean
Delvare <jdelvare@...e.de> in the To: field?

The origins of this matching code are pretty old and Jean is more
experienced there than I am. Nonetheless, I will check it, too, of
course.

Thanks for the work!

> 
> > ---
> > 
> > diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> > index 5ec082e2039d..77eea5c0bc71 100644
> > --- a/drivers/i2c/i2c-core-base.c
> > +++ b/drivers/i2c/i2c-core-base.c
> > @@ -475,17 +475,6 @@ static int i2c_device_probe(struct device *dev)
> >  
> >  	driver = to_i2c_driver(dev->driver);
> >  
> > -	/*
> > -	 * An I2C ID table is not mandatory, if and only if, a suitable OF
> > -	 * or ACPI ID table is supplied for the probing device.
> > -	 */
> > -	if (!driver->id_table &&
> > -	    !acpi_driver_match_device(dev, dev->driver) &&
> > -	    !i2c_of_match_device(dev->driver->of_match_table, client)) {
> > -		status = -ENODEV;
> > -		goto put_sync_adapter;
> > -	}
> > -
> >  	if (client->flags & I2C_CLIENT_WAKE) {
> >  		int wakeirq;
> >  
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
> 

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