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

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Date:   Tue, 23 Apr 2019 15:55:24 +0000
From:   Vitor Soares <Vitor.Soares@...opsys.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>,
        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

Hi Boris,

From: Boris Brezillon <boris.brezillon@...labora.com>
Date: Tue, Apr 23, 2019 at 16:14:16

> 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.

Where should it be documented? Can you give an example?


Thanks,
Vitor Soares