linux-kernel - Re: [PATCH 1/3] remap: Add I3C bus support

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Date:   Tue, 23 Apr 2019 17:14:16 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     Mark Brown <broonie@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "knaack.h@....de" <knaack.h@....de>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "lorenzo.bianconi83@...il.com" <lorenzo.bianconi83@...il.com>,
        "bbrezillon@...nel.org" <bbrezillon@...nel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "joao.pinto@...opsys.com" <Joao.Pinto@...opsys.com>
Subject: Re: [PATCH 1/3] remap: Add I3C bus support

On Tue, 23 Apr 2019 14:58:06 +0000
Vitor Soares <Vitor.Soares@...opsys.com> wrote:

> Hi Mark,
> 
> From: Mark Brown <broonie@...nel.org>
> Date: Tue, Apr 16, 2019 at 16:39:48
> 
> > On Mon, Apr 15, 2019 at 09:19:39PM +0200, Vitor Soares wrote:
> >   
> > > +++ b/drivers/base/regmap/regmap-i3c.c
> > > @@ -0,0 +1,62 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.  
> > 
> > Please make the entire header C++ style so it looks more consistent.
> > Otherwise this looks good modulo   
> 
> I will change it next drop.
> 
> > Boris' comment; I'm fine with leaving
> > extra modes for later so long as they can be introduced without
> > disrupting existing users so the only question there would be if we
> > should name the init function in some way that's specific to the I/O
> > mode being used here.  
> 
> My concern is that booth modes (SDR/HDR) might be needed on the device.
> e.g. use SDR to configure the device and use HDR to send/receive large 
> data.

I'd say that we shouldn't use the regmap abstraction in this case or
have a driver-specific backend implementation for it. I guess the
common case is "regs are accessed in SDR mode", so let's keep the name
as it is now and we'll define devm_regmap_init_i3c_hdr() if we ever
need it. Please make it explicit in the kernel-doc that we're using SDR
transfers here.