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From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Dongchun Zhu <dongchun.zhu@mediatek.com>,
	linus.walleij@linaro.org, bgolaszewski@baylibre.com,
	mchehab@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com,
	drinkcat@chromium.org, tfiga@chromium.org,
	matthias.bgg@gmail.com, bingbu.cao@intel.com,
	srv_heupstream@mediatek.com, linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, sj.huang@mediatek.com,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	louis.kuo@mediatek.com, shengnan.wang@mediatek.com
Subject: Re: [V7, 2/2] media: i2c: dw9768: Add DW9768 VCM driver
Date: Wed, 10 Jun 2020 15:58:12 +0300
Message-ID: <20200610125812.GF16711@paasikivi.fi.intel.com> (raw)
In-Reply-To: <20200609111428.GH2428291@smile.fi.intel.com>

Hi Andy, Dongchun,

On Tue, Jun 09, 2020 at 02:14:28PM +0300, Andy Shevchenko wrote:
> On Tue, Jun 09, 2020 at 11:45:41AM +0800, Dongchun Zhu wrote:
> > On Mon, 2020-06-08 at 16:27 +0300, Andy Shevchenko wrote:
> > > On Sat, Jun 06, 2020 at 02:19:18PM +0800, Dongchun Zhu wrote:
> > > > On Fri, 2020-06-05 at 15:46 +0300, Andy Shevchenko wrote:
> > > > > On Fri, Jun 05, 2020 at 06:54:12PM +0800, Dongchun Zhu wrote:
> 
> ...
> 
> > > > > > +#define DW9768_AAC_TIME_DEFAULT			0x20
> > > > > 
> > > > > Hex? Why not decimal?
> > > > > 
> > > > 
> > > > There is one optional property 'dongwoon,aac-timing' defined in DT.
> > > > I don't know whether you have noticed that.
> > > > 
> > > > 'DW9768_AAC_TIME_DEFAULT' is the value set to AACT[5:0] register.
> > > > I thought the Hex unit should be proper as it is directly written to the
> > > > Hex register.
> > > 
> > > I see. I would rather put it like (BIT(6) / 2) to show explicitly that we
> > > choose half of the resolution.
> > > 
> > 
> > I knew your idea.
> > '(BIT(6) / 2)' may somewhat show the meaning of 'median of the total
> > range of AACT[5:0]'.
> > 
> > But this value is still very obscure relative to '0x20'.
> > As I thought that simple is the best, especially for kernel upstream
> > patch.
> 
> Okay, let's wait for maintainers to speak up.

The value 0x20 is the device default, I don't see it having any other
special significance. So I'm totally fine with 0x20.

-- 
Kind regards,

Sakari Ailus

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-05 10:54 [V7, 0/2] media: i2c: Add support for " Dongchun Zhu
2020-06-05 10:54 ` [V7, 1/2] media: dt-bindings: media: i2c: Document DW9768 bindings Dongchun Zhu
2020-06-09 19:47   ` Rob Herring
2020-06-05 10:54 ` [V7, 2/2] media: i2c: dw9768: Add DW9768 VCM driver Dongchun Zhu
2020-06-05 12:14   ` Sakari Ailus
2020-06-05 13:02     ` Tomasz Figa
2020-06-05 13:37       ` Sakari Ailus
2020-06-06  6:24     ` Dongchun Zhu
2020-06-05 12:46   ` Andy Shevchenko
2020-06-05 13:10     ` Tomasz Figa
2020-06-06  6:19     ` Dongchun Zhu
2020-06-08 13:27       ` Andy Shevchenko
2020-06-09  3:45         ` Dongchun Zhu
2020-06-09 11:14           ` Andy Shevchenko
2020-06-10 12:58             ` Sakari Ailus [this message]
2020-06-05 13:44   ` Tomasz Figa
2020-06-06  6:42     ` Dongchun Zhu

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