linux-kernel - Re: [PATCH -next v4 2/3] media: ov772x: use SCCB regmap

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Date:   Thu, 19 Jul 2018 16:10:20 +0300
From:   sakari.ailus@....fi
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>, jacopo mondi <jacopo@...ndi.org>,
        Akinobu Mita <akinobu.mita@...il.com>,
        linux-media@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Peter Rosin <peda@...ntia.se>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>
Subject: Re: [PATCH -next v4 2/3] media: ov772x: use SCCB regmap

On Thu, Jul 19, 2018 at 03:14:06PM +0300, Laurent Pinchart wrote:
> On Thursday, 19 July 2018 11:42:08 EEST Wolfram Sang wrote:
> > > > -static int ov772x_mask_set(struct i2c_client *client, u8  command, u8 
> > > > mask,
> > > > -			   u8  set)
> > > > -{
> > > > -	s32 val = ov772x_read(client, command);
> > > > -
> > > > -	if (val < 0)
> > > > -		return val;
> > > > -
> > > > -	val &= ~mask;
> > > > -	val |= set & mask;
> > > > -
> > > > -	return ov772x_write(client, command, val);
> > > > -}
> > > > -
> > > 
> > > If I were you I would have kept these functions and wrapped the regmap
> > > operations there. This is not an issue though if you prefer it this
> > > way :)
> > 
> > I have suggested this way. It is not a show stopper issue, but I still
> > like this version better.
> 
> Wrapping the regmap functions minimizes the diff and makes it easier to 
> backport the driver.

May be, but using the regmap functions directly makes the driver cleaner.
Most drivers have some kind of wrappers around the I²C framework (or
regmap) functions; this one is one of the few to get rid of them.

The two could be done in a separate patch, too, albeit I think the current
one seems fine as such.

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi