linux-kernel - Re: [PATCH 6/7] dt-bindings: clock: xilinx: describe whether dynamic reconfig is enabled

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Message-ID: <D2YT8KJZ7HA8.3D38BIII4J2T1@protonmail.com>
Date: Thu, 25 Jul 2024 17:53:14 +0000
From: Harry Austen <hpausten@...tonmail.com>
To: Conor Dooley <conor@...nel.org>
Cc: Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Michal Simek <michal.simek@....com>, Shubhrajyoti Datta <shubhrajyoti.datta@....com>, linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/7] dt-bindings: clock: xilinx: describe whether dynamic reconfig is enabled

On Mon Jul 22, 2024 at 6:13 PM BST, Conor Dooley wrote:
> On Sat, Jul 20, 2024 at 12:01:58PM +0000, Harry Austen wrote:
> > Xilinx clocking wizard IP core's dynamic reconfiguration support is
> > optionally enabled at build time. Add a devicetree boolean property to
> > describe whether the hardware supports this feature or not.
> > 
> > Signed-off-by: Harry Austen <hpausten@...tonmail.com>
> > ---
> >  .../devicetree/bindings/clock/xlnx,clocking-wizard.yaml    | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/clock/xlnx,clocking-wizard.yaml b/Documentation/devicetree/bindings/clock/xlnx,clocking-wizard.yaml
> > index 4609bb56b06b5..890aeebf6f375 100644
> > --- a/Documentation/devicetree/bindings/clock/xlnx,clocking-wizard.yaml
> > +++ b/Documentation/devicetree/bindings/clock/xlnx,clocking-wizard.yaml
> > @@ -40,6 +40,12 @@ properties:
> >        - const: s_axi_aclk
> >  
> >  
> > +  xlnx,dynamic-reconfig:
> > +    type: boolean
>
> The type here should be "flag" not boolean, boolean can be set to
> "false" and what you're likely doing is just checking for the property
> being present. "flag" doesn't allow false.

That sounds like exactly what I want. Will update to "flag" in v2.

Thanks!

>
> > +    description:
> > +      Indicate whether the core has been configured with support for dynamic
> > +      runtime reconfguration of the clocking primitive MMCM/PLL.
> > +
> >    xlnx,speed-grade:
> >      $ref: /schemas/types.yaml#/definitions/uint32
> >      enum: [1, 2, 3]
> > @@ -88,6 +94,7 @@ examples:
> >          compatible = "xlnx,clocking-wizard-v6.0";
> >          reg = <0xb0000000 0x10000>;
> >          #clock-cells = <1>;
> > +        xlnx,dynamic-reconfig;
> >          xlnx,speed-grade = <1>;
> >          xlnx,nr-outputs = <6>;
> >          clock-names = "clk_in1", "s_axi_aclk";
> > -- 
> > 2.45.2
> > 
> >