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Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator and generic property

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Hi

On Thu, Jun 9, 2016 at 3:03 AM, Rob Herring <robh@kernel.org> wrote:
> On Tue, Jun 07, 2016 at 11:29:02AM +0200, Krzysztof Kozlowski wrote:
>> On 06/03/2016 04:02 AM, Rob Herring wrote:
>> >>  Optional properties:
>> >>  - reset-gpios : contains a list of GPIO specifiers. The reset GPIOs are asserted
>> >> @@ -16,6 +22,7 @@ Optional properties:
>> >>    See ../clocks/clock-bindings.txt for details.
>> >>  - clock-names : Must include the following entry:
>> >>    "ext_clock" (External clock provided to the card).
>> >> +- ext-supply : External regulator supply
>> >
>> > What happens when there are 2 supplies?
>> >
>> > I'd prefer the name not be genericish and use the real supply names.
>> > Then the power seq code should just turn on all supplies it finds. If
>> > the order or timing to turn on matters, then sorry, no generic sequence.
>>
>> I think the generic part for regulators might be a problem. Regulator
>> API requires a name for the supply... it cannot get "something" or
>> "everything".
>
> That's the downside of variable property names...
>
>> The driver could attach itself to any kind of node (where power-sequence
>> property exists) so the supply name depends on the bindings of device
>> (not bindings of power sequence driver).
>>
>> The power sequence driver could however iterate over child properties
>> and get the names of all supplies. It is a little bit ugly...
>
> Yes. Like this, right?
>
> for_each_property_of_node(np, pp) {
>         if (!strstr(pp->name, "-supply"))
>                 continue;
>         // found supply
> }
>
> The uglyness can always be improved with a function to do this parsing.

There's already a version of this in simplefb. Maybe it's time to move
this to a common function?

ChenYu

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[PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix  USB/LAN when TFTP booting) Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:10 +0200
  [PATCH v3 02/12] MAINTAINERS: Retain Ulf Hansson as the same  maintainer of pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:20 +0200
  [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator and  generic property Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:20 +0200
    Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for  regulator and generic property Rob Herring <robh@kernel.org> - 2016-06-03 04:10 +0200
      Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator  and generic property Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-03 14:40 +0200
        Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for  regulator and generic property Peter Chen <hzpeterchen@gmail.com> - 2016-06-06 05:30 +0200
      Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator  and generic property Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-07 11:30 +0200
        Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for  regulator and generic property Rob Herring <robh@kernel.org> - 2016-06-08 21:10 +0200
          Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator  and generic property Chen-Yu Tsai <wens@csie.org> - 2016-06-09 04:40 +0200
            Re: [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator  and generic property Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-09 07:20 +0200
  [PATCH v3 10/12] EXAMPLE CODE: usb: hub: Power sequence the ports on  activation Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:20 +0200
  [PATCH v3 04/12] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:20 +0200
  [PATCH v3 03/12] power: pwrseq: Enable COMPILE_TEST for drivers Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-01 10:20 +0200
  Re: [PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix USB/LAN when TFTP booting) Heiko Stübner <heiko@sntech.de> - 2016-06-06 22:50 +0200
    Re: [PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix  USB/LAN when TFTP booting) Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2016-06-07 08:10 +0200

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