linux-kernel - Re: [RFC PATCH 1/3] dt-bindings: clock: lan966x: Extend for clock gate support

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Date:   Fri, 29 Oct 2021 14:06:31 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Rob Herring <robh@...nel.org>
CC:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <nicolas.ferre@...rochip.com>, <kavyasree.kotagiri@...rochip.com>,
        <eugen.hristev@...rochip.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/3] dt-bindings: clock: lan966x: Extend for clock
 gate support

The 10/26/2021 22:08, Rob Herring wrote:

Hi Rob,

> 
> On Tue, Oct 19, 2021 at 10:44:47AM +0200, Horatiu Vultur wrote:
> > It is required to add a new resource to be able to access the clock gate
> > registers. Now that we have 2 resources, add also reg-names property to
> > make more clear.
> 
> It is an ABI breakage to require 2 reg entries. If that's okay for this
> binding, you need to explain why. The binding requiring 2 so that DT
> files get updated, but the driver allowing for 1 is okay.

I will make the resource optional not to break any ABI.

> 
> >
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > ---
> >  .../bindings/clock/microchip,lan966x-gck.yaml       | 13 +++++++++++--
> >  1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml b/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml
> > index fca83bd68e26..047c77e049f1 100644
> > --- a/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml
> > +++ b/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml
> > @@ -19,7 +19,14 @@ properties:
> >      const: microchip,lan966x-gck
> >
> >    reg:
> > -    maxItems: 1
> > +    items:
> > +      - description: core registers
> > +      - description: gate registers
> > +
> > +  reg-names:
> > +    items:
> > +      - const: core
> > +      - const: gate
> >
> >    clocks:
> >      items:
> > @@ -39,6 +46,7 @@ properties:
> >  required:
> >    - compatible
> >    - reg
> > +  - reg-names
> >    - clocks
> >    - clock-names
> >    - '#clock-cells'
> > @@ -52,6 +60,7 @@ examples:
> >          #clock-cells = <1>;
> >          clocks = <&cpu_clk>, <&ddr_clk>, <&sys_clk>;
> >          clock-names = "cpu", "ddr", "sys";
> > -        reg = <0xe00c00a8 0x38>;
> > +        reg = <0xe00c00a8 0x38>, <0xe00c02cc 0x4>;
> > +        reg-names = "core", "gate";
> >      };
> >  ...
> > --
> > 2.33.0
> >
> >

-- 
/Horatiu