linux-kernel - Re: [PATCH 1/7] dt-bindings: soc: new driver for DaVinci genpd

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Date:   Thu, 08 Feb 2018 16:40:54 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     David Lechner <david@...hnology.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>,
        Russell King <linux@...linux.org.uk>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 1/7] dt-bindings: soc: new driver for DaVinci genpd

Bartosz Golaszewski <brgl@...ev.pl> writes:

> 2018-02-07 22:47 GMT+01:00 David Lechner <david@...hnology.com>:
>> On 02/07/2018 07:45 AM, Bartosz Golaszewski wrote:
>>>
>>> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>>
>>> Add a simple document for the DaVinci genpd driver. We use clock pm
>>> exclusively hence no reg property.
>>>
>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>> ---
>>>   .../devicetree/bindings/soc/ti,davinci-pm-domains.txt       | 13
>>> +++++++++++++
>>>   1 file changed, 13 insertions(+)
>>>   create mode 100644
>>> Documentation/devicetree/bindings/soc/ti,davinci-pm-domains.txt
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/soc/ti,davinci-pm-domains.txt
>>> b/Documentation/devicetree/bindings/soc/ti,davinci-pm-domains.txt
>>> new file mode 100644
>>> index 000000000000..935d063c7b35
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/soc/ti,davinci-pm-domains.txt
>>> @@ -0,0 +1,13 @@
>>> +Device tree bindings for the genpd driver for Texas Instruments DaVinci
>>> SoCs
>>> +
>>> +Required properties:
>>> +
>>> +- compatible:           must be "ti,davinci-pm-domains"
>>> +- #power-domain-cells:  must be 0
>>> +
>>> +Example:
>>> +
>>> +pwc1: power-controller@...000 {
>>> +       compatible = "ti,davinci-pm-domains";
>>> +       #power-domain-cells = <0>;
>>> +};
>>>
>>
>>
>> We already have the PSC @227000. Why not just add
>> #power-domain-cells = <0>; to that node instead of creating
>> a new "device" when this is really the same device?
>
> I thought about it too, but then noticed that most architectures do
> use a separate genpd driver even if it only calls routines placed in
> their respective clock driver.
>
> Let me prepare a v2 with this approach though.

Yes, I agree with David.  Just making the PSC be a power-controller is a
good approach.

Kevin