linux-kernel - Re: [PATCH v3 03/11] i2c: npcm: Fix client address calculation

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Date:   Fri, 4 Mar 2022 21:39:11 +0800
From:   Tyrone Ting <warp5tw@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     avifishman70@...il.com, tmaimon77@...il.com, tali.perry1@...il.com,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        robh+dt@...nel.org, krzysztof.kozlowski@...onical.com,
        yangyicong@...ilicon.com, semen.protsenko@...aro.org,
        wsa@...nel.org, jie.deng@...el.com, sven@...npeter.dev,
        bence98@....bme.hu, lukas.bulwahn@...il.com, arnd@...db.de,
        olof@...om.net, tali.perry@...oton.com, Avi.Fishman@...oton.com,
        tomer.maimon@...oton.com, KWLIU@...oton.com, JJLIU0@...oton.com,
        kfting@...oton.com, openbmc@...ts.ozlabs.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 03/11] i2c: npcm: Fix client address calculation

Hi Andy:

Thank you for your comment and it'll be addressed.

Andy Shevchenko <andriy.shevchenko@...ux.intel.com> 於 2022年3月3日 週四 下午6:31寫道：
>
> On Thu, Mar 03, 2022 at 04:31:33PM +0800, Tyrone Ting wrote:
> > From: Tali Perry <tali.perry1@...il.com>
> >
> > Fix i2c client address by left-shifting 1 bit before
> > applying it to the data register.
>
> ...
>
> > -     bus->dest_addr = slave_addr;
> > +     bus->dest_addr = slave_addr << 1;
>
> 1. Why this is not using i2c_8bit_addr_from_msg() helper?
> 2. This is duplication of what npcm_i2c_master_start_xmit() does.
>
> Taking 2 into account, what is this exactly fixing?
> Sounds like a red herring.
>
> --
> With Best Regards,
> Andy Shevchenko
>
>

Best regards,
Tyrone