linux-kernel - Re: [PATCH v3 1/3] phy: Add exynos-simple-phy driver

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Date:	Thu, 15 May 2014 11:23:50 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Rahul Sharma <rahul.sharma@...sung.com>
Cc:	Tomasz Stanislawski <t.stanislaws@...sung.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Grant Likely <grant.likely@...aro.org>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	sunil joshi <joshi@...sung.com>
Subject: Re: [PATCH v3 1/3] phy: Add exynos-simple-phy driver

On Thu, May 15, 2014 at 01:47:33PM +0530, Rahul Sharma wrote:
> On 15 May 2014 13:12, Thierry Reding <thierry.reding@...il.com> wrote:
> > On Thu, May 15, 2014 at 10:49:37AM +0530, Rahul Sharma wrote:
> >> On 15 May 2014 03:44, Thierry Reding <thierry.reding@...il.com> wrote:
> >> > On Thu, May 15, 2014 at 12:47:21AM +0530, Rahul Sharma wrote:
[...]
> >> >> +#define PHY_NR       5
> >> >
> >> > I'm not sure that this belongs here either. It's not a value that will
> >> > ever appear in a DT source file.
> >>
> >> I want it to grow along with new additions in the phy list else
> >> catastrophic. This will look unrelated in driver.
> >
> > But this is in no way growing automatically as it is. Whoever adds a new
> > type of PHY will need to manually increment this define. Furthermore the
> > driver will need to be updated to cope with this anyway.
> 
> Not automatically. What I meant was If keeping it at end of the list, it is not
> possible that somebody skip the updation of PHY_NR when adding a new phy
> type.

It's perhaps not as likely, but still possible.

> If I leave a comment at the end of the list to update PHY_NR (after moving it
> to driver), that also serves the purpose.

I don't think this is needed either. Like I said earlier, since the
driver has an internal maximum number of PHYs that it supports the
maximum that can be specified in the DTS is irrelevant. If it doesn't
support a new one, then it will simply return an error. And I would
assume that if somebody added support for a new PHY type then they
probably wouldn't forget to update the driver since they're modifying
it anyway and testing will fail if they don't.

Thierry

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