linux-kernel - Re: [PATCH 01/16] mfd: madera: Add register definitions for Cirrus Logic Madera codecs

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Message-ID: <CACRpkdY=cOhw59O8EE6J82aq897YKZkLsmUzeEnzkC5jtT6yyA@mail.gmail.com>
Date:   Fri, 7 Apr 2017 10:30:12 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:     Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "open list:WOLFSON MICROELECTRONICS DRIVERS" 
        <patches@...nsource.wolfsonmicro.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/16] mfd: madera: Add register definitions for Cirrus
 Logic Madera codecs

On Fri, Apr 7, 2017 at 10:27 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Wed, Apr 5, 2017 at 12:07 PM, Richard Fitzgerald
> <rf@...nsource.wolfsonmicro.com> wrote:
>
>> This patch adds a header file of register definitions for Cirrus
>> Logic "Madera" class codecs. These codecs are all based off a common
>> set of hardware IP so have a common register map (with a few minor
>> device-to-device variations). These are complex devices with a large
>> mber of features and so have a correspondingly large register set.
>> The registers.h file has been auto-generated from the hardware register
>> definitions, stripped down to only registers we need to access from
>> the driver.
>>
>> Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
>
> This:
>  include/linux/mfd/madera/registers.h | 8832 ++++++++++++++++++++++++++++++++++
>
> Get included in all subdrivers I suppose?
>
> So you are broadcasting 8800+ lines into every subdriver across the
> entire kernel.
>
> Just the time spent in the preprocessor parsing this will affect compilation
> time.

Or maybe this is a necessary sacrifice to get the regmap cache
centralized in MFD. I don't know. I feel stupid.

I guess I should focus on "my" subsystems...

Yours,
Linus Walleij