linux-kernel - Re: [PATCH 1/7] dt-bindings: clock: split qcom,gcc-ipq4019 to separate file

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Message-ID: <CA+HBbNHmDeBBBc31OayTjegi4KrAgqOiRLQscorENjqg3dEa3Q@mail.gmail.com>
Date:   Thu, 16 Feb 2023 11:41:20 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     andersson@...nel.org, agross@...nel.org, konrad.dybcio@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, luka.perkov@...tura.hr
Subject: Re: [PATCH 1/7] dt-bindings: clock: split qcom,gcc-ipq4019 to
 separate file

On Thu, Feb 16, 2023 at 11:16 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 14/02/2023 17:23, Robert Marko wrote:
> > Move schema for the GCC on IPQ4019 platform to a separate file to be able
> > to allow passing XO and sleep clks directly to GCC.
> >
> > Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> > ---
> >  .../bindings/clock/qcom,gcc-ipq4019.yaml      | 53 +++++++++++++++++++
> >  .../bindings/clock/qcom,gcc-other.yaml        |  2 -
> >  2 files changed, 53 insertions(+), 2 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/clock/qcom,gcc-ipq4019.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc-ipq4019.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc-ipq4019.yaml
> > new file mode 100644
> > index 0000000000000..6ebaef2288fa3
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/qcom,gcc-ipq4019.yaml
> > @@ -0,0 +1,53 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/clock/qcom,gcc-ipq4019.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Qualcomm Global Clock & Reset Controller on IPQ4019
> > +
> > +maintainers:
> > +  - Stephen Boyd <sboyd@...nel.org>
> > +  - Taniya Das <tdas@...eaurora.org>
> > +  - Robert Marko <robert.markoo@...tura.hr>
> > +
> > +description: |
> > +  Qualcomm global clock control module provides the clocks, resets and power
> > +  domains on IPQ4019.
> > +
> > +  See also:: include/dt-bindings/clock/qcom,gcc-ipq4019.h
> > +
> > +allOf:
> > +  - $ref: qcom,gcc.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: qcom,gcc-ipq4019
> > +
> > +  clocks:
> > +    items:
> > +      - description: board XO clock
> > +      - description: sleep clock
> > +
> > +  clock-names:
> > +    items:
> > +      - const: xo
> > +      - const: sleep_clk
> > +
> > +required:
> > +  - compatible
>
> Aren't the clocks now required? Will it keep working without them?

There are not required, this just allows passing them but the driver is
still using global matching until in patch 2 XO and sleep clocks are converted
to use parent data and in patch 3 they are passed via phandles to GCC,
however, even then global matching by name is preserved in the driver
as a fallback
to keep backward compatibility.

However, I see your point, after parent data conversion they should be
required by
schema as that is preferred over global matching.

I will wait for some time for feedback on other patches and then send
v2 that includes
that change.

Regards,
Robert
>
> Best regards,
> Krzysztof
>


-- 
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@...tura.hr
Web: www.sartura.hr