linux-kernel - Re: [PATCH] mfd: rohm-bdXXX - switch to use i2c probe

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Date:   Wed, 15 Apr 2020 12:04:05 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
Cc:     "mazziesaccount@...il.com" <mazziesaccount@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: rohm-bdXXX - switch to use i2c probe_new

On Wed, 15 Apr 2020, Vaittinen, Matti wrote:

> Hello Lee,
> 
> On Wed, 2020-04-15 at 10:50 +0100, Lee Jones wrote:
> > On Thu, 26 Mar 2020, Matti Vaittinen wrote:
> > 
> > > ROHM BD70528 and BD718x7 drivers do not utilize the I2C id.
> > > Do the trivial conversion and make them to use probe_new
> > > instead of probe.
> > 
> > Not sure I understand the purpose of the patch.
> > 
> > The only reason to switch to probe_new is to aid the removal of the
> > compulsory I2C tables.  However, neither of these drivers have them.
> 
> Maybe I have misunderstood the probe_new. My understanding was that the
> probe_new is what should become the standard - Eg. eventually all I2C
> drivers would use probe which is not getting the ID tables as argument
> - and the old probe could be removed. Thus I thought conversion of
> probe to probe_new would be required in order to get rid of the old
> probe. I think I got this understanding when I submitted driver for
> BD71828 - and I think it was you who suggested me to switch to
> probe_new as 'id' was unused. But if please just drop this patch if
> this change is not needed!

Some I2C drivers do make use of 'id' though.  So the standard probe
will probably never go away.  I wrote probe_new for drivers that
wished to omit the I2C table.  A better use of your time would be to
go through the original probe users and figure out which I2C tables
can be removed.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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