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

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Date:	Thu, 15 May 2014 13:47:33 +0530
From:	Rahul Sharma <rahul.sharma@...sung.com>
To:	Thierry Reding <thierry.reding@...il.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 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:
>> Hi Thierry,
>>
>> 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 HDMI_PHY     0
>> >> +#define DAC_PHY      1
>> >> +#define ADC_PHY      2
>> >> +#define PCIE_PHY     3
>> >> +#define SATA_PHY     4
>> >
>> > Perhaps these should be namespaced somehow to avoid potential conflicts
>> > with other PHY providers?
>>
>> How about XXX_SIMPLE_PHY?
>
> The indices are specific to the Exynos PHY device, so why not
> PHY_EXYNOS_SIMPLE_XXX (or any variation thereof)?

This looks ok. I will use that.

>
>> >> +#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.

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 think this is even a reason to have this only in the driver. Otherwise
> you could have a situation where somebody upgrades the binding (and this
> file along with it) but not update the driver with the necessary support.
> But the driver will still pick up the PHY_NR change and will accept the
> new PHY type as valid, even though it has no code to handle it. If you
> have this in the driver, however, then as long as the driver has not yet
> been updated it will reject requests for the new PHY type. And that's
> exactly what it should be doing since it doesn't know how to handle it.

hmn...Ok.

Regards,
Rahul Sharma

>
> Thierry
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