Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node

From	Rob Herring <robh+dt@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node
Date	2015-10-23 14:00 +0200
Message-ID	<qmJaO-wP-3@gated-at.bofh.it> (permalink)
References	<qlbux-3xU-3@gated-at.bofh.it> <qmtfI-2HW-27@gated-at.bofh.it> <qmxMm-Tv-13@gated-at.bofh.it> <qmGwi-5dp-15@gated-at.bofh.it>
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On Fri, Oct 23, 2015 at 4:08 AM, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
> On Thursday 22 October 2015 18:41:05 Rob Herring wrote:
>> On Thu, Oct 22, 2015 at 1:52 PM, Ray Jui wrote:
>> > On 10/22/2015 11:43 AM, Rob Herring wrote:
>> >> On Mon, Oct 19, 2015 at 12:43 AM, Pramod Kumar wrote:
>> >>> Add ngpios property to the gpio controller's DT node so that controller
>> >>> driver extracts total number of gpio lines present in controller
>> >>> from DT and removes dependency on driver.
>> >>>
>> >>> Signed-off-by: Pramod Kumar <pramodku@broadcom.com>
>> >>> Reviewed-by: Ray Jui <rjui@broadcom.com>
>> >>> Reviewed-by: Scott Branden <sbranden@broadcom.com>
>> >>> ---
>> >>>
>> >>>  Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt | 5 +++
>> >>>  1 file changed, 5 insertions(+)
>> >>>
>> >>> diff --git
>> >>> a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> >>> b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> >>> index f92b833..655a8d7 100644
>> >>> --- a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> >>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> >>>
>> >>> @@ -10,6 +10,9 @@ Required properties:
>> >>>       Define the base and range of the I/O address space that contains
>> >>> the Cygnus
>> >>>   GPIO/PINCONF controller registers
>> >>>
>> >>> +- ngpios:
>> >>> +    Total number of GPIOs the controller provides
>> >>
>> >> This must be optional for compatibility and the driver needs to handle
>> >> it not present.
>> >
>> > You meant to be compatible with existing Cygnus devices, correct?
>> >
>> > Just to clarify, here you suggest we still leave the existing hard coded
>> > ngpios in the driver, in order to be compatible with all existing Cygnus
>> > devices (while the Cygnus device tree changes to use ngpio is still being
>> > merged and through different maintainer), and have all new iProc SoCs
>> > switch to use ngpios from device tree, right?
>>
>> Yes, an existing dtb should continue to work with a new kernel. You
>> can add the DT property to the older devices too and then eventually
>> remove the hard coded values some time in the future. That could be
>> immediately (don't care about compatibility at all), a couple of
>> kernel cycles, never... It all depends on users of the impacted
>> platforms.
>
> But shouldn't the property still be documented as required to ensure that new
> DTs always include it ?

Good point. If the intent is to eventually remove it from the driver,
then yes. We probably need "required for new designs" as a category or
maybe "recommended"? The wording is not so important here, but I'm
thinking about as we try to standardize the naming.

Rob
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Thread

[PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Pramod Kumar <pramodku@broadcom.com> - 2015-10-19 07:50 +0200
  Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Rob Herring <robh+dt@kernel.org> - 2015-10-22 20:50 +0200
    Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller  node Ray Jui <rjui@broadcom.com> - 2015-10-22 21:00 +0200
      Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Rob Herring <robh+dt@kernel.org> - 2015-10-23 01:50 +0200
        Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-10-23 11:10 +0200
          Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Rob Herring <robh+dt@kernel.org> - 2015-10-23 14:00 +0200
            Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-10-23 15:10 +0200
              Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller  node Ray Jui <rjui@broadcom.com> - 2015-10-23 18:10 +0200
                RE: [PATCH 05/11] dt-binding: Add ngpios property to GPIO  controller node Pramod Kumar <pramodku@broadcom.com> - 2015-10-26 18:10 +0100
                Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller  node Ray Jui <rjui@broadcom.com> - 2015-10-26 18:20 +0100
                RE: [PATCH 05/11] dt-binding: Add ngpios property to GPIO  controller node Pramod Kumar <pramodku@broadcom.com> - 2015-10-26 19:10 +0100
                Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller  node Ray Jui <rjui@broadcom.com> - 2015-10-26 19:10 +0100
  Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node Linus Walleij <linus.walleij@linaro.org> - 2015-10-27 10:50 +0100
    RE: [PATCH 05/11] dt-binding: Add ngpios property to GPIO  controller node Pramod Kumar <pramodku@broadcom.com> - 2015-10-28 06:20 +0100

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