linux-kernel - Re: [PATCH 3/3] i2c:support new register set for ast2600

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Message-ID: <20210618035855.GB31659@aspeedtech.com>
Date:   Fri, 18 Jun 2021 11:58:55 +0800
From:   Jamin Lin <jamin_lin@...eedtech.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Rob Herring <robh+dt@...nel.org>, Joel Stanley <joel@....id.au>,
        "Andrew Jeffery" <andrew@...id.au>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Wolfram Sang" <wsa+renesas@...g-engineering.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Jean Delvare" <jdelvare@...e.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Khalil Blaiech <kblaiech@...lanox.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Bence Csókás <bence98@....bme.hu>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Mike Rapoport <rppt@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        "open list:I2C SUBSYSTEM HOST DRIVERS" <linux-i2c@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        ChiaWei Wang <chiawei_wang@...eedtech.com>,
        Troy Lee <troy_lee@...eedtech.com>,
        Steven Lee <steven_lee@...eedtech.com>
Subject: Re: [PATCH 3/3] i2c:support new register set for ast2600

The 06/17/2021 10:36, Andy Shevchenko wrote:
> On Thu, Jun 17, 2021 at 05:43:40PM +0800, Jamin Lin wrote:
> > Add i2c new driver to support new register set for AST2600.
> > AST2600 support three modes for data transfer which are
> > byte mode, buffer mode and dma mode, respectively.
> > The global driver of i2c is used to set the new register
> > mode and define the base clock frequency
> > of baseclk_1~baseclk_4.
> > 
> > Signed-off-by: Jamin Lin <jamin_lin@...eedtech.com>
> > ---
> >  drivers/i2c/busses/Kconfig              |   11 +
> >  drivers/i2c/busses/Makefile             |    1 +
> >  drivers/i2c/busses/ast2600-i2c-global.c |  205 +++
> >  drivers/i2c/busses/ast2600-i2c-global.h |   25 +
> >  drivers/i2c/busses/i2c-new-aspeed.c     | 1796 +++++++++++++++++++++++
> 
> I commented _something_ (but read comments carefully, they will cover much
> more). The overall it seems you have to:
>  - shrink the code base by at least ~15% (it's possible), i.e. -200 LOCs
Can you describe it more detail?
Do you mean I should separate the patch file to fix size limitation? 
>  - rethink how you do calculations and bit operations
>  - better code style
>
Thanks for your review and very good suggestion
I will update them and sent patch again.
By the way, I received test failed email from Robot due to compiling
warning. I will fix them, too. 

> -- 
> With Best Regards,
> Andy Shevchenko
> 
>