Message-ID: <CAPdUM4M5k-aouSA=dyUXWOyFLBhob+o8103a=gAxo-O68i-MCw@mail.gmail.com>
Date:	Fri, 16 May 2014 15:12:01 +0530
From:	Rahul Sharma <rahul.sharma@...sung.com>
To:	Tomasz Figa <tomasz.figa@...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>,
	PANKAJ KUMAR DUBEY <pankaj.dubey@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	sunil joshi <joshi@...sung.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>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v3 1/3] phy: Add exynos-simple-phy driver

On 16 May 2014 03:14, Tomasz Figa <tomasz.figa@...il.com> wrote:
> On 15.05.2014 06:01, Rahul Sharma wrote:
>> Thanks Tomasz,
>>
>> On 15 May 2014 01:31, Tomasz Figa <tomasz.figa@...il.com> wrote:
>>> Hi Rahul, Tomasz,
>> [snip]
>>>> +     simplephys: simple-phys@...40000 {
>>>> +             compatible = "samsung,exynos5250-simple-phy";
>>>
>>> Missing reg property or unnecessary @unit-address suffix in node name.
>>
>> I should have removed "@unit-address". I will change this.
>>
>>>
>>>> +             samsung,pmu-syscon = <&pmu_system_controller>;
>>>> +             #phy-cells = <1>;
>>>> +     };
>>>
>>> In general, the idea is quite good, but I think this should rather bind
>>> to the main PMU node, since this is just a part of the PMU, not another
>>> device in the system. This also means that the PMU node itself should be
>>> the PHY provider.
>>>
>>
>> Please correct me if I got you wrong. You want somthing like this:
>>
>> pmu_system_controller: system-controller@...40000 {
>>          ...
>>           simple_phys: simple-phys {
>>                         compatible = "samsung,exynos5420-simple-phy";
>>                         ...
>>           };
>> };
>
> Not exactly.
>
> What I meant is that the PMU node itself should be the PHY provider, e.g.
>
> pmu_system_controller: system-controller@...40000 {
>         /* ... */
>         #phy-cells = <1>;
> };
>
> and then the PMU node should instantiate the Exynos simple PHY driver,
> as this is a driver for a facility existing entirely inside of the PMU.
> Moreover, the driver should be rather called Exynos PMU PHY.
>
> I know this isn't really possible at the moment, but with device tree we
> must design things carefully, so it's better to take a bit more time and
> do things properly.
>
> So my opinion on this is that there should be a central Exynos PMU
> driver that claims the IO region and instantiates necessary subdrivers,
> such as Exynos PMU PHY driver, Exynos CLKOUT driver, Exynos cpuidle
> driver and more, similar to what is being done in drivers/mfd.

Hi Tomasz,



>
> Now, there is already ongoing effort to convert current freestanding PMU
> configuration code in mach-exynos into a full-fledged PMU driver, but
> not exactly in the same direction as I stated above. I'll try to
> cooperate with Pankaj, who is responsible for this work to make this go
> into the right track.
>
> Best regards,
> Tomasz
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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