linux-kernel - RE: [RESEND PATCH v4 1/2] dt-bindings: at24: Add address-width property

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Date:   Mon, 9 Jul 2018 03:12:18 +0000
From:   "Chiang, AlanX" <alanx.chiang@...el.com>
To:     "Robert P. J. Day" <rpjday@...shcourse.ca>,
        Rob Herring <robh@...nel.org>
CC:     "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "Yeh, Andy" <andy.yeh@...el.com>,
        "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "Shevchenko, Andriy" <andriy.shevchenko@...el.com>,
        "Mani, Rajmohan" <rajmohan.mani@...el.com>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "tfiga@...omium.org" <tfiga@...omium.org>,
        "jcliang@...omium.org" <jcliang@...omium.org>,
        "brgl@...ev.pl" <brgl@...ev.pl>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [RESEND PATCH v4 1/2] dt-bindings: at24: Add address-width
 property

Hi Robert,

> -----Original Message-----
> From: Robert P. J. Day [mailto:rpjday@...shcourse.ca]
> Sent: Friday, July 6, 2018 4:24 AM
> To: Rob Herring <robh@...nel.org>
> Cc: Chiang, AlanX <alanx.chiang@...el.com>; linux-i2c@...r.kernel.org; Yeh,
> Andy <andy.yeh@...el.com>; sakari.ailus@...ux.intel.com;
> andriy.shevchenko@...ux.intel.com; Shevchenko, Andriy
> <andriy.shevchenko@...el.com>; Mani, Rajmohan
> <rajmohan.mani@...el.com>; andy.shevchenko@...il.com;
> tfiga@...omium.org; jcliang@...omium.org; brgl@...ev.pl;
> mark.rutland@....com; arnd@...db.de; gregkh@...uxfoundation.org;
> linux-kernel@...r.kernel.org; devicetree@...r.kernel.org
> Subject: Re: [RESEND PATCH v4 1/2] dt-bindings: at24: Add address-width
> property
> 
> On Thu, 5 Jul 2018, Rob Herring wrote:
> 
> > On Mon, Jul 02, 2018 at 05:12:19PM +0800, alanx.chiang@...el.com wrote:
> > > From: Alan Chiang <alanx.chiang@...el.com>
> > >
> > > The AT24 series chips use 8-bit address by default. If some chips
> > > would like to support more than 8 bits, the at24 driver should be
> > > added the compatible field for specfic chips.
> > >
> > > Provide a flexible way to determine the addressing bits through
> > > address-width in this patch.
> > >
> > > Signed-off-by: Alan Chiang <alanx.chiang@...el.com>
> > > Signed-off-by: Andy Yeh <andy.yeh@...el.com>
> > > Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > >
> > > ---
> > > since v1:
> > > -- Remove the address-width field in the example.
> > > since v2:
> > > -- Remove redundant space.
> > > since v3:
> > > -- Add Acked-by.
> > >
> > > ---
> > >  Documentation/devicetree/bindings/eeprom/at24.txt | 2 ++
> > >  1 file changed, 2 insertions(+)
> >
> > Reviewed-by: Rob Herring <robh@...nel.org>
> 
>   "... should be added the compatible field ..."??
> 
> rday

Maybe I should modify the sentence as below that makes it clear.
"The compatible field should be added in the at24.c for specific chips.".

I quote Andy's words in patch v2:
"The current at24 driver has no address width support, thus, reusing same
(allocated) IDs (non-DT case) is hard."

This is the reason that I submitted the patch.

Thanks

> 
> --
> 
> ==========================================================
> ==============
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                   http://crashcourse.ca/dokuwiki
> 
> Twitter:                                       http://twitter.com/rpjday
> LinkedIn:                               http://ca.linkedin.com/in/rpjday
> ==========================================================
> ==============