linux-kernel - Re: [PATCH 3/7] media: imx274: don't hard-code the subdev name to DRIVER

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Date:   Thu, 30 Aug 2018 08:58:13 +0200
From:   Philippe De Muyter <phdm@...q.eu>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>,
        Hans Verkuil <hverkuil@...all.nl>,
        Luca Ceresoli <luca@...aceresoli.net>,
        linux-media@...r.kernel.org, Leon Luo <leonl@...pardimaging.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] media: imx274: don't hard-code the subdev name to
        DRIVER_NAME

Hi.

On Thu, Aug 30, 2018 at 12:23:23AM +0300, Laurent Pinchart wrote:
> Hello,
> 
> On Wednesday, 29 August 2018 14:38:43 EEST Sakari Ailus wrote:
> > On Wed, Aug 29, 2018 at 01:29:36PM +0200, Philippe De Muyter wrote:
> > > On Wed, Aug 29, 2018 at 02:07:21PM +0300, Sakari Ailus wrote:
> > >> On Tue, Aug 28, 2018 at 06:02:55PM +0200, Philippe De Muyter wrote:
> 
> [snip]
> 
> > >>> Then we should probably also apply the following patch I submitted :
> > >>> 
> > >>> "media: v4l2-common: v4l2_spi_subdev_init : generate unique name"
> > >>> 
> > >>> 	https://patchwork.kernel.org/patch/10553035/
> > >>> 
> > >>> and perhaps
> > >>> 
> > >>> "media: v4l2-common: simplify v4l2_i2c_subdev_init name generation"
> > >>> 
> > >>> 	https://patchwork.kernel.org/patch/10553037/
> > >> 
> > >> The problem with this patch is that the existing naming scheme is very
> > >> similar while the new one offers no tangible benefits apart from being
> > >> in line with the rest of the kernel. That's still not a benefit for uAPI:
> > >> changing the name is certain to break user space applications.
> > > 
> > > I agree with you on the patch for v4l2_i2c_subdev_init (I wrote
> > > 'perhaps'), but you don't say anything on the one about
> > > v4l2_spi_subdev_init :), which fixes an actual bug.  I have 2 identical
> > > SPI-controlled sensors on the same board, and without my patch they get
> > > the same subdev name.  Of course, I could fix that in the sensor driver
> > > itself, but that's not what we want, or do we ?
> > 
> > Good point. I missed the naming of the SPI devices ignored any bus
> > information there. I'm rather inclined towards taking the SPI patch. Hans,
> > Mauro, Laurent; any opinion on that?
> 
> I agree that the SPI patch makes sense, I think we should take it.

Do I need to resend https://patchwork.kernel.org/patch/10553035/ "media:
v4l2-common: v4l2_spi_subdev_init : generate unique name", adding Sakari's
and Laurent's Acked-by ? or will that patch be taken automagically ?

Philippe

-- 
Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles